Compositions comprising biosurfactants and manganese

Abstract

The present invention relates to a composition comprising a biosurfactant and manganese. It further relates to a method of stabilizing the color of a composition comprising a biosurfactant and the use of manganese for stabilizing the color of a composition comprising a biosurfactant.

Description

Field of the invention

[0001] The present invention relates to a composition comprising a biosurfactant and manganese.

[0002] It further relates to a method of stabilizing the color of a composition comprising a biosurfactant and the use of manganese for stabilizing the color of a composition comprising a biosurfactant. State of the art

[0003] Surfactants are used in many different compositions and applications. Due to the need for more sustainability, biosurfactants are replacing classic surfactants which are often based on petrochemicals or non-renewable raw materials.

[0004] As glycolipids produced by fermentation, biosurfactants are difficult to purify and / or concentrate in a colorless manner. They also have the disadvantage that they exhibit color instability and tend to darken and / or brown during storage.

[0005] Although this color instability can not be an important problem in technical applications like oil field or hydraulic fracturing applications, it can hinder the acceptance of biosurfactants in technical fields like cosmetics or home care.

[0006] It was therefore an object of the present invention to provide a color stable biosurfactant composition.

[0007] Invention Description Surprisingly it was found that the addition of small amounts of manganese can stabilize compositions comprising biosurfactants in terms of color.

[0008] The present invention therefore provides a composition comprising a biosurfactant and an amount of manganese.

[0009] The present invention further provides a method of stabilizing the color of a composition comprising a biosurfactant and the use of manganese for stabilizing the color of a composition comprising a biosurfactant.

[0010] One advantage of the present invention is that the composition according to the present invention has a positive odor profile.

[0011] Another advantage of the present invention is that the composition according to the present invention has an improved color stability. Discoloration reactions can come from Maillard reactions, which are chemical reactions between proteins or amino acids and sugars. Biosurfactants produced by fermentation like rhamnolipids, sophorolipids or Rubiwettin usually contain small amounts of reaction partners (proteins and sugars). These small concentrations are enough to change the color from light to dark.

[0012] A further advantage is that the compositions according to the present application have improved surface cleaning properties.

[0013] Another advantage is that the compositions according to the present application have excellent foaming properties.

[0014] A further advantage of the compositions according to the present application is that they have reduced irritation to human skin.

[0015] Another advantage of the compositions according to the present application is their mildness and good physiological compatibility, in particular characterized by high values in the red blood cell (RBC) test.

[0016] A further advantage of the compositions according to the present application is their good skin feel during and after washing.

[0017] Another advantage of the compositions according to the present application is that they leave a smooth and soft skin feel after washing.

[0018] Another advantage is the excellent microbial stability of the compositions according to the present application.

[0019] Another advantage is that the compositions according to the present application have improved ability to dissolve oils and fats.

[0020] Another advantage is that the compositions according to the present application lead to better chemical stability of the raw materials, which increases the shelf life.

[0021] Another advantage is that the compositions according to the present application lead to lower side reaction formation and higher formulation purity.

[0022] Another advantage of the present application is that the compositions according to the present application exhibit especially good emulsifying and dispersing properties.

[0023] An advantage of the present application is that the compositions of the present application have very good cleaning performance, especially in terms of removing fatty stains from fabrics.

[0024] Another advantage of the present application is that the compositions of the present application can be rinsed off very easily from surfaces or fibers that have been cleaned.

[0025] A further advantage is that the compositions of the present application support the stability of enzymes in storage.

[0026] An advantage of the present application is the homogeneity of the compositions of the present application even at low pH values.

[0027] Another advantage of the present application is that the compositions of the present application are more easily dilutable, especially in aqueous media.

[0028] Another advantage of the present application is that the compositions of the present application are easily miscible with other surfactants.

[0029] A further advantage of the present invention is that the compositions of the present invention can be more easily incorporated into cosmetic formulations.

[0030] Another advantage of the present invention is that the compositions of the present invention enable the formulation of concentrated surfactant preparations, even at very low pH levels.

[0031] Another advantage of the present invention is that the compositions of the present invention have a reduced tendency to foam due to their high concentration and achievable low pH value, thus simplifying transportation and delivery.

[0032] Another advantage of the present invention is that the compositions of the present invention allow for the easy incorporation of hydrophobic components such as oils.

[0033] Another advantage of the present invention is that the compositions of the present invention have high storage stability.

[0034] A further advantage of the present invention is that the compositions of the present invention cause less contamination during their production and pipeline transportation, and are easier to clean.

[0035] Another advantage of the present invention is that the composition of the present invention has a very low freezing point, which means that the composition remains processable even at low temperatures.

[0036] Another advantage of the present invention is that the compositions of the present invention, especially cosmetic or cleaning preparations, will maintain color stability.

[0037] Another advantage of the present invention is that the compositions of the present invention, especially cosmetic or cleaning preparations, have low color intensity.

[0038] This invention includes a composition comprising A) 0.5% to 90% by weight, preferably 3.0% to 85% by weight, even more preferably 15% to 80% by weight, more preferably 25% to 75% by weight, and most preferably 40% to 70% by weight of at least one biosurfactant, and B) Manganese ions ranging from 0.01 ppm to 500 ppm, preferably from 0.1 ppm to 200 ppm, more preferably from 1.0 ppm to 50 ppm, and most preferably from 2.0 ppm to 19 ppm. The weight percentages and parts per million are relative to the total composition.

[0039] In the context of this invention, "biosurfactant" is understood to refer to all glycolipids produced by fermentation. The term "biosurfactant" also covers glycolipids that have been chemically or enzymatically modified after fermentation, provided that the glycolipid structure is retained.

[0040] The raw materials used to produce usable biosurfactants are carbohydrates, especially sugars such as glucose, and / or lipophilic carbon sources such as fats, oils, glycerides, fatty acids, fatty alcohols, and long-chain saturated or unsaturated hydrocarbons.

[0041] In the context of this invention, the term "surfactant" is understood to refer to an organic substance with interfacial properties capable of reducing the surface tension of water to below 45 mN / m at 20°C and at a concentration of 0.5% by weight based on the total composition. Surface tension was determined at 20°C using the DuNoüy ring method.

[0042] Unless otherwise stated, the averages mentioned below are multiple averages.

[0043] Unless otherwise stated, percentages are expressed as weight percentages.

[0044] Unless otherwise stated, parts per million (ppm) are data in parts per million by weight.

[0045] Unless otherwise stated, all measurements were taken at a temperature of 25°C and a pressure of 1013 mbar, as stated below.

[0046] Unless otherwise stated, “pH” in this invention is defined as the value of the relevant composition measured using a pH electrode pair calibrated according to ISO 4316 (1977) after stirring at 25°C for 5 minutes.

[0047] The biosurfactant included in the composition according to the invention is preferably a separated biosurfactant.

[0048] In the context of this invention, the term "biosurfactant" means glycolipids produced by fermentation, and the term "isolated biosurfactant" has the meaning commonly used in the field of biotechnology.

[0049] The composition according to the application preferably comprises at least one biosurfactant selected from rhamnolipids, sophorolipids, glucolipids, cellulosic lipids, mannosylerythritol lipids and trehalose lipids, preferably rhamnolipids, sophorolipids and glucolipids, preferably rhamnolipids and glucolipids, most preferably rhamnolipids, as component A). The biosurfactants can be produced, for example, as described in EP 0 499 434, US 7,985,722, WO 03 / 006146, DE 19648439, DE 19600743, JP 01 304034, CN 1337439, JP 2006 274233, JP 2006 083238, JP 2006 070231, WO 03 / 002700, FR 2740779, DE 2939519, US 7.556,654, FR 2855752, EP 1445302, JP 2008062179 and JP 2007 181789 or documents cited therein. Suitable biosurfactants are available, for example, from Soliance, France.

[0050] Preferably, the composition according to the application has at least one as biosurfactant selected from rhamnolipids, in particular mono-, di- or poly-rhamnolipids, glucolipids, in particular mono-, di- or poly-glucolipids, and sophorolipids, in particular mono-, di- or poly-sophorolipids, preferably selected from rhamnolipids and glucolipids, most preferably rhamnolipids.

[0051] The term "rhamnolipid" is preferably understood in the context of the present application to mean in particular a compound of the general formula (I) Formula (I) wherein mRL = 2, 1 or 0, nRL = 1 or 0, R 1RL and R 2RL = independently of one another identical or different organic residues having 2 to 24, preferably 5 to 13, carbon atoms, in particular optionally branched, optionally substituted, in particular hydroxy-substituted, optionally unsaturated, in particular optionally mono-, di- or tri-unsaturated alkyl residues, preferably selected from pentenyl, heptenyl, nonenyl, undecenyl and tridecenyl and (CH2) o -CH3, wherein o = 1 to 23, preferably 4 to 12.

[0052] If nRL = 1, the glycosidic bond between the two rhamnose units is preferably in the alpha-configuration. The optically active carbon atom of the fatty acid is preferably present as the R-enantiomer (e.g. (R)-3-{(R)-3-[2-O-(alpha-L- rhamnopyranosyl)-alpha-L-rhamnopyranosyl]oxydecanoyl}oxydecanoate).

[0053] The term "di-rhamnolipid" is understood in the context of the present application to mean a compound of general formula (I) or a salt thereof, wherein nRL = 1.

[0054] The term "mono-rhamnolipid" is understood in the context of the present application to mean a compound of general formula (I) or a salt thereof, wherein nRL = 0.

[0055] Different rhamnolipids are abbreviated according to the following nomenclature: "diRL-CXCY" is understood to mean a di-rhamnolipid of general formula (I), wherein nRL = 1, wherein one of the residues R 1RL and R 2RL = (CH2) o -CH3, wherein o = X-4, and the remaining residues R 1RL or R 2RL = (CH2) o -CH3, wherein o = Y-4.

[0056] "monoRL-CXCY" is understood to mean a mono-rhamnolipid of general formula (I), wherein one of the residues R 1RL and R 2RL = (CH2) o -CH3, wherein o = X-4, and the remaining residues R 1RL or R 2RL = (CH2) o -CH3, wherein o = Y-4.

[0057] Thus, the used nomenclature does not distinguish between "CXCY" and "CYCX".

[0058] For rhamnolipids wherein mRL = 0, monoRL-CX or diRL-CX is used accordingly.

[0059] If one of the above-mentioned designations X and / or Y carries ":Z", this means that the respective residue R 1RL and / or R 2RL equals an unbranched, unsubstituted hydrocarbon residue having X-3 or Y-3 carbon atoms with Z double bonds.

[0060] Methods for the preparation of the relevant rhamnolipids are disclosed, for example, in EP 2786743 and EP 2787065.

[0061] The rhamnolipids suitable for use in this invention can also be derived from Pseudomonas spp., especially... Pseudomonas aeruginosa ( Pseudomonas aeruginosa The fermentation of rhamnolipin is preferably carried out in non-genetically modified cells, a technique disclosed in the 1980s, as described in, for example, EP0282942 and DE4127908. Rhamnolipin produced in *Pseudomonas aeruginosa* cells that have been genetically modified to achieve higher rhamnolipin titers can also be used in this invention; for example, Lei et al. disclosed such cells in Biotechnol Lett. 2020 June; 42(6):997-1002.

[0062] Rhamnolipids produced by Pseudomonas aeruginosa are available from Jeneil Biotech Inc., for example under the trade name Zonix; from Logos Technologies (technology acquired by Stepan), for example under the trade name NatSurFac; from Biotensidion GmbH, for example under the trade name Rhapynal; from AGAE technologies, for example under the names R90, R95, R95Md, and R95Dd; from Locus Bio-Energy Solutions; and from Shanghai Yusheng Industry Co. Ltd., for example under the trade name Bio-201 Glycolipids.

[0063] This invention provides a composition preferably comprising rhamnolipid as a biosurfactant, characterized in that the biosurfactant component A) comprises 51% to 100% by weight, preferably 60% to 95% by weight, particularly preferably 80% to 90% by weight of monorhamnolipids, especially those of formula (I) in which nRL=0. The weight percentage is based on the sum of all rhamnolipids present.

[0064] This surprisingly increases the viscosity of the composition according to the invention. Preferably, this preferred embodiment is combined with a certain amount of detergent (see below), preferably a detergent of the carboxymethyl inulin type.

[0065] The present invention further provides a composition preferably comprising rhamnolipid as a biosurfactant, characterized in that the biosurfactant component A) comprises 51% to 95% by weight, preferably 55% to 80% by weight, particularly preferably 60% to 70% by weight of diRL-C10C10. The weight percentage is based on the sum of all rhamnolipids present.

[0066] A preferred composition according to the present application is characterized in that it comprises rhamnolipids as described above as biosurfactants in an amount of 0.5 to 15 wt.%, preferably 3 to 12 wt.%, in particular preferably 5 to 10 wt.% of diRL-C10C12:1, wherein the weight percentages are referred to the sum of all rhamnolipids present.

[0067] A further preferred composition according to the present application is characterized in that it comprises rhamnolipids as described above as biosurfactants in an amount of 0.5 to 25 wt.%, preferably 3 to 15 wt.%, in particular preferably 5 to 12 wt.% of diRL-C10C12, wherein the weight percentages are referred to the sum of all rhamnolipids present.

[0068] A further preferred composition according to the present application is characterized in that it comprises rhamnolipids as described above as biosurfactants in an amount of 0.1 to 25 wt.%, preferably 2 to 10 wt.%, in particular preferably 4 to 8 wt.% of diRL-C8C10, wherein the weight percentages are referred to the sum of all rhamnolipids present.

[0069] A still further preferred composition according to the present application is characterized in that it comprises rhamnolipids as described above as biosurfactants in an amount of 0.1 to 5 wt.%, preferably 0.5 to 3 wt.%, in particular preferably 0.5 to 2 wt.% of monoRL-C8C10 and / or, preferably and 0.1 to 5 wt.%, preferably 0.5 to 3 wt.%, in particular preferably 0.5 to 2 wt.% of monoRL-C10C10, wherein the weight percentages are referred to the sum of all rhamnolipids present.

[0070] The present application provides a composition comprising rhamnolipids as biosurfactants, which is alternatively preferred, characterized in that the biosurfactant component A) comprises 10 to 50 wt.%, preferably 20 to 40 wt.%, in particular preferably 25 to 35 wt.% of monoRL-C10C10, and wherein the weight percentages are referred to the sum of all rhamnolipids present.

[0071] The alternative preferred composition according to the present application is characterized in that it comprises rhamnolipids as biogenic surfactants as described above in an amount of 10 to 30 wt.-%, preferably 12 to 25 wt.-%, particularly preferably 15 to 20 wt.-% of diRL-C10C10, wherein the weight percentages are referred to the sum of all rhamnolipids present.

[0072] The alternative preferred composition according to the present application is characterized in that it comprises rhamnolipids as biogenic surfactants as described above in an amount of 10 to 30 wt.-%, preferably 12 to 25 wt.-%, particularly preferably 15 to 20 wt.-% of monoRL-C8C10, wherein the weight percentages are referred to the sum of all rhamnolipids present.

[0073] The alternative preferred composition according to the present application is characterized in that it comprises rhamnolipids as biogenic surfactants as described above in an amount of 3 to 25 wt.-%, preferably 5 to 20 wt.-%, particularly preferably 10 to 15 wt.-% of monoRL-C10C12:1, wherein the weight percentages are referred to the sum of all rhamnolipids present.

[0074] The alternative preferred composition according to the present application is characterized in that it comprises rhamnolipids as biogenic surfactants as described above in an amount of 1 to 15 wt.-%, preferably 2 to 10 wt.-%, particularly preferably 3 to 8 wt.-% of diRL-C10C12, wherein the weight percentages are referred to the sum of all rhamnolipids present.

[0075] In the present application, the term “sophorolipids” is preferably understood to mean the compounds of the general formulae (IIa) and (IIb) and salts thereof formula (IIa) formula (IIb) wherein R 1SL = H or CO-CH3, R 2SL = H or CO-CH3, R 3SL = a divalent organic moiety comprising 6 to 32 carbon atoms and which is unsubstituted or substituted by hydroxyl functions, unbranched and optionally comprising 1 to 3 double or triple bonds, R 4SL = H, CH3or a monovalent organic radical which comprises 2 to 10 carbon atoms and which is unsubstituted or substituted by hydroxyl function, unbranched and optionally comprises 1 to 3 double or triple bonds, and nSL = 1 or 0.

[0076] Sophorolipids can be used according to the present application in their acid form or in their lactone form.

[0077] Preferred compositions according to the present application comprise sophorolipids, wherein the weight ratio of lactone form to acid form is in the range of 20:80 to 80:20, especially preferred in the range of 30:70 to 40:60.

[0078] For determining the content of acid or lactone form of sophorolipids in a formulation reference is made to EP 1411111 B1, page 8, paragraph

[0053] .

[0079] With respect to the present application the term "glucolipid" is preferably understood to mean a compound of the general formula (III) and salts thereof, formula (III) wherein mGL = 3, 2, 1 or 0, preferably 1 or 0, R 1GL and R 2GL = independently of one another identical or different organic radicals having 2 to 24 carbon atoms, in particular optionally branched, optionally substituted, in particular hydroxyl-substituted, optionally unsaturated, in particular optionally mono-, di- or tri-unsaturated alkyl radicals, preferably selected from the group consisting of pentenyl, heptenyl, nonenyl, undecenyl and tridecenyl and (CH2) o -CH3, wherein o = 1 to 23, preferably 4 to 12.

[0080] Different glucolipids are abbreviated according to the following nomenclature: "GL-CXCY" is understood to mean a glucolipid of the general formula (III), wherein one of the radicals R 1GL and R 2GL = (CH2) o -CH3, wherein o = X-4, and the remaining radicals R 1GL or R 2GL = (CH2) o -CH3, wherein o = Y-4.

[0081] Thus, the used nomenclature does not distinguish between "CXCY" and "CYCX".

[0082] If one of the above-mentioned designations X and / or Y carries ":Z", this means that the corresponding radical R 1GL and / or R2GL = An unbranched, unsubstituted hydrocarbon group with Z double bonds and X-3 or Y-3 carbon atoms.

[0083] The method for producing glucose lipoprotein can be as described in WO2019154970.

[0084] In this invention, when determining the content of component A), the mass of the non-salt form is considered; therefore, the weight of the corresponding cation is not considered.

[0085] In this invention, the content of component B) refers to manganese ions in the solution, rather than, for example, solid manganese salts in the composition.

[0086] To determine the manganese ion content in the composition according to the invention, inductively coupled plasma mass spectrometry (ICP-MS) is preferably used.

[0087] The compositions according to the invention may contain high concentrations of components A) and B) to be advantageously useful, for example, in the production of end-customer formulations.

[0088] In this case, it is preferred in the present invention that the composition according to the invention is characterized by comprising A) 25% to 75% by weight, more preferably 40% to 70% by weight of at least one biosurfactant, and B) Manganese ions from 0.1 ppm to 500 ppm, more preferably from 0.5 ppm to 50 ppm, and even more preferably from 1.0 ppm to 19 ppm. The weight percentages and parts per million are relative to the total composition.

[0089] The compositions according to the invention may contain component concentrations that are advantageously useful as formulations for end customers.

[0090] In this case, alternatively preferred in the present invention is that the composition according to the invention is characterized by comprising A) 0.5% to 25% by weight, more preferably 1.0% to 20% by weight, and most preferably 3.0% to 15% by weight of at least one biosurfactant, and B) Manganese ions ranging from 0.01 ppm to 500 ppm, more preferably from 0.5 ppm to 50 ppm, and even more preferably from 1.0 ppm to 19 ppm. The weight percentages and parts per million are relative to the total composition.

[0091] The alternative preferred composition according to the invention is preferably a pharmaceutical preparation, especially a dermatological preparation or a cosmetic preparation.

[0092] The alternative preferred compositions according to the present application are alternatively preferred household care formulations, such as cleaning formulations or laundry formulations.

[0093] The compositions according to the present application preferably comprise water, preferably in an amount of 5 to 95 wt.-%, more preferably 20 to 80 wt.-%, more preferably 30 to 70 wt.-%, wherein the weight percent is referred to the total composition.

[0094] The compositions according to the present application preferably have a pH of 2.0 to 12.5, preferably 5.0 to 10.0, particularly preferably 5.5 to 9.0.

[0095] If the compositions according to the present application are used as, for example, laundry detergents, they preferably have a pH of 7.0 to 12.5, preferably 7.5 to 12.0, particularly preferably 8.0 to 12.0.

[0096] If the compositions according to the present application are used as, for example, hand dishwashing detergents or cosmetic agents, they preferably alternatively have a pH of 4 to 8, preferably 4.5 to 7.5, particularly preferably 5 to 6.5.

[0097] The compositions according to the present application preferably have a Gardner color value of 0.01 to 15, preferably 0.5 to 8, more preferably 1 to 5.

[0098] The compositions according to the present application preferably comprise C) at least one preservative.

[0099] The compositions according to the present application are preferably characterized in that the preservative is selected from the group comprising, preferably consisting of: p-methoxybenzoic acid, benzoic acid, levulinic acid, sorbic acid, lactic acid, mandelic acid, salicylic acid, dehydroacetic acid, caprylyl oxy-hydroxamic acid, cinnamic acid, geranic acid, nonanoic acid and salts of the aforementioned acids, methyl-p-hydroxybenzoate, ethyl-p-hydroxybenzoate, phenylpropanol, benzyl alcohol, phenylethanol, phenoxyethanol, propylene glycol, pentylene glycol, 1,2-hexanediol, octyldiglycol, undecylenic alcohol, methylpropylene glycol, ethylhexylglycerin, n-octylglycerin, n-heptylglycerin, n-hexylglycerin, methylheptylglycerin, undecenamide propyltrimethylammonium methosulfate, isothiazolinones, preferably selected from the group consisting of chloromethylisothiazolinone (CIT), methylisothiazolinone (MIT), benzisothiazolinone (BIT), butylbenzisothiazolinone (BBIT), triethyl citrate, citral, hydroxymethylglycinate, caprylyl glycerols, Iodopropynyl butylcarbamate (IPBC), and Sodium decanoyl / lauroyl lactyl lactylate.

[0100] The compositions according to the invention can be formulated as cosmetic compositions; preferably, in this case, the following applies: The composition according to the invention preferably contains at least one additional component selected from... Cosmetic active ingredients Moisturizer Emulsifier, Thickener / viscosity modifier / stabilizer UV protection filter Antioxidants Water-soluble growth promoters Solids and fillers Film-forming agent, Pearlescent additives Deodorizing and antiperspirant active ingredients, Insect repellent, Tanning agent, Conditioner, essence, dye, Odor absorbent Superfatting agents. Other solvents, Select the best active ingredients for cosmetics.

[0101] Substances that can be used as exemplary representatives of the various categories are known to those skilled in the art and can be found, for example, in German application DE 102008001788.4. This patent application is incorporated herein by reference and thus constitutes a part of this disclosure.

[0102] For further optional components and the amounts of these components, please refer to relevant manuals known to those skilled in the art, such as K. Schrader, "Grundlagen und Rezepturen der Kosmetika [Cosmetics -fundamentals and formulations]", 2nd edition, pp. 329-341, Hüthig Buch VerlagHeidelberg.

[0103] The amount of a particular additive depends on its intended use.

[0104] Typical boundary formulations for the respective applications are known from the prior art and contained in, for example, the manufacturer's brochures for the particular bases and active ingredients. These present formulations can generally be employed without modification. If desired, however, in order to adjust and optimize, the required modifications can be made by simple experiments and are not complex.

[0105] The composition according to the present application can be formulated as a home care composition; preferably, in this case, the following apply: The composition according to the present application preferably comprises one or more auxiliaries selected from the group consisting of bleaching systems, hydrotropes, polymers (which can be synthetic), biopolymers, anti-redeposition aids, fibre protection agents, soil release agents, dye transfer inhibitors, fabric hueing agents, opacifiers, bluing dyes, enzyme stabilizers, solvents, viscosity modifiers, preservatives, pH adjusting agents and salts such as NaCI and Na2S04.

[0106] A further aspect of the present application is a method of stabilizing the color of a composition comprising a biosurfactant, comprising the steps of a) providing a composition comprising a biosurfactant, and b) adding manganese to said composition to a concentration of 0.01 ppm to 500 ppm, preferably 0.10 ppm to 200 ppm, more preferably 1.0 ppm to 50 ppm, most preferably 2.0 ppm to 19 ppm of manganese ions, wherein the ppm refer to the total composition.

[0107] The preferred method according to the present application is characterized in that the manganese is added in the form of manganese oxide, manganese hydroxide and / or a manganese salt, preferably as an aqueous solution, wherein the oxide is preferably selected from the group consisting of Mn02, Mn304, Mn203, MnO, Mn207and Mn03, and the salt is preferably selected from the group consisting of MnS04, MnCI2, Mn(CH3C02)2, MnC03, Mn(N03)2, manganese gluconate and manganese permanganate, such as KMn04.

[0108] Preferably, the biosurfactant comprised in the composition provided in step a) of the method of the present application is an isolated biosurfactant.

[0109] The preferred method according to the present application is characterized in that the biosurfactant is selected from the group consisting of rhamnolipids, glucolipids and sophorolipids, preferably rhamnolipids and glucolipids, most preferably rhamnolipids.

[0110] The preferred method according to the present application is characterized in that the composition comprising a biosurfactant provided in step a) has a Gardner color value of 0.01 to 15, preferably 0.5 to 8, more preferably 1 to 5.

[0111] A suitable method for determining the Gardner colour number is the third edition of ISO 4630-2015 Clear liquids — Estimation of colour by the Gardner colour scale.

[0112] In case of turbid materials, such as emulsions, a different colour determination method needs to be used.

[0113] The CIELAB colour space is defined by L*a*b values, wherein the lightness L is a relevant indicator for colour.

[0114] The preferred method according to the present application is characterized in that the composition comprising a biosurfactant provided in step a) has a L colour value of the CIELAB colour space of 20 to 100, preferably 30 to 95, more preferably 50 to 90.

[0115] A suitable method for determining the L colour value of the CIELAB colour space is the measurement of the surface reflectance using a spectrophotometer Konica-Minolta CM-700d.

[0116] In case of the use according to the present application, the particularly preferred embodiments of the composition and method according to the present application and their preferred components are likewise preferred for the use according to the present application, also as regards their amounts.

[0117] A further aspect of the present application is the use of manganese ions for improving the colour stability of a composition comprising at least one biosurfactant.

[0118] A further aspect of the present application is the use of manganese ions for preventing malodour of a composition comprising at least one biosurfactant.

[0119] In case of the use according to the present application, the particularly preferred embodiments of the composition and method according to the present application and their preferred components are likewise preferred for the use according to the present application, also as regards their amounts.

[0120] The examples cited below exemplarily describe the present application without the intention to limit the present application to the embodiments specified in the examples, the scope of application of which is apparent from the entire description and claims. BRIEF DESCRIPTION OF DRAWINGS Figure 1 : Dose-dependent colour stabilization of 50% rhamnolipids by MnS04 Figure 2 : Dose-dependent colour stabilization of 15% rhamnolipids by MnS04 Figure 3 : Dose-dependent colour stabilization of 15% rhamnolipids by manganese oxides Figure 4 : Dose dependent color de-stabilization of 15% rhamnolipids by iron and copper ions Figure 5 : Dose dependent color stabilization of 50% glucose lipids by MnS04.

[0122] Examples : Example 1 : Dose dependent color stabilization of 50% rhamnolipids solution by MnS04 Rhamnolipids were prepared as described in Example 1 of EP3023431.

[0123] MnS04xH20 was added to a 50 wt% rhamnolipids aqueous solution, pre-diluted from 1% (w / w) in water to a final concentration of 1 ppm and 100 ppm Mn 2+ and mixed well.

[0124] Samples were filled into air tight containers and incubated at 45°C.

[0125] At the indicated time points, samples were withdrawn and measured by spectrophotometry according to ISO 4630.

[0126] Results (Gardner) are shown in Figure 1 .

[0127] Example 2: Dose dependent color stabilization of 15% rhamnolipids solution by MnS04 Rhamnolipids were prepared as described in Example 1 of EP3023431.

[0128] MnS04xH20 was added to a 15 wt% rhamnolipids aqueous solution, pre-diluted from 1% (w / w) in water to a final concentration of 1 ppm and 100 ppm Mn 2+ and mixed well.

[0129] Samples were filled into air tight containers and incubated at 45°C.

[0130] At the indicated time points, samples were withdrawn and measured by spectrophotometry according to ISO 4630.

[0131] Results (Gardner) are shown in Figure 2 .

[0132] Example 3: Color stabilization of 15% rhamnolipids solution by different manganese oxides Rhamnolipids were prepared as described in Example 1 of EP3023431.

[0133] Manganese oxide was added to a 15 wt% rhamnolipid aqueous solution at concentrations of 500 and 3000 ppm and incubated at room temperature under stirring for 60 min. Subsequently, manganese oxides were isolated by filtration using a pressure coarse filter (1 bar) with K800 filter disc (Seitz PALL).

[0134] The results obtained a composition with low Mn 2+ concentration (<10 ppm).

[0135] The samples were filled into air-tight containers and incubated at 45 °C.

[0136] At the indicated time points, samples were withdrawn and measured spectrophotometrically according to ISO 4630.

[0137] The results (Gardner) are shown in the table below and Figure 3 .

[0138] Example 4 (not according to the application): Dose-dependent color influence of iron and copper salts on 15% rhamnolipid solutions Rhamnolipids were prepared as described in Example 1 of EP3023431.

[0139] FeS04*7H20 or CuS04*5H20 was added to the dirhamnolipid material, pre-diluted from 1% (w / w) to a final concentration and mixed thoroughly. The samples were filled into air-tight containers and incubated at 45 °C. At the indicated time points, samples were withdrawn and measured spectrophotometrically according to ISO 4630.

[0140] The results (Gardner) are shown in Figure 4 .

[0141] Example 5: Dose-dependent color stabilization of MnS04on 50% glucolipid solutions Glucolipids were prepared as described in WO2019 / 154970.

[0142] MnS04xH20 was added to a 50 wt% glucolipid aqueous solution, pre-diluted from 1% (w / w) in water to a final concentration of 10 ppm and 25 ppm Mn 2+ and mixed thoroughly.

[0143] The samples were filled into air-tight containers and incubated at 45 °C.

[0144] At the indicated time points, samples were withdrawn and measured spectrophotometrically according to ISO 4630.

[0145] The results (Gardner) are shown inFigure 5 Medium.

[0146] Example 6: Prevention of malodour of biosurfactant composition using MnS04 Rhamnolipids were prepared as described in Example 1 of EP3023431.

[0147] MnS04xH20 was added to a 50 wt% rhamnolipid aqueous solution, pre-diluted at 1% (w / w) in water to a final concentration of 0 ppm and 10 ppm Mn 2+ and mixed thoroughly.

[0148] The samples were filled into air-tight containers and incubated at 45°C for 50 days.

[0149] The effect of manganese on the organoleptic properties of rhamnolipid compositions was tested by using a panel of trained panellists for the odour evaluation.

[0150] By trained panellists is meant here individuals who have previously undergone an olfactory acuity screening and are experienced with comparing biosurfactant samples. In addition, the panellists are familiarized with malodour samples prior to performing the sample evaluation.

[0151] Regarding the odour property “rancid”, the results are shown in the table below on a scale from 1 to 5.

[0152] Example 7: Formulation examples Rhamnolipids (RL) were prepared as described in Example 1 of EP3023431.

[0153] Mono-rhamnolipids (mRL) were prepared as described in Example 2 of EP3672690.

[0154] The sophorolipids (SL) used were sophorolipids REWO FERM® SL ONE from Evonik with a ratio of lactone to acid of 40:60.

[0155] Gluconolipids (GL) were produced by fermentation according to Example 2 of WO2019154970.

[0156] MnS04xH20 was used as manganese source.

[0157] The following compositions were prepared in water: .

[0158] Each stock solution SF1 to SF10 was used to prepare the following formulations, wherein SFX stands for the respective stock solution; thus, 10 different formulations are explicitly disclosed in each of the following formulations.

[0159] Formula 1a: Bath Milk 。

[0160] Formula 2a, 2b: Body Shampoo 。

[0161] Formula 3a: Shampoo 。

[0162] Formula 4a: Shampoo 。

[0163] Formula 5a: Liquid Soap 。

[0164] Formula 6a: Liquid Soap 。

[0165] Formula 7a: Cream Soap 。

[0166] Formula 8a: Oil Bath 。

[0167] Formula 9a, 9b: Oil Bath 。

[0168] Formula 10a: Micellar Water for Make-up Removal 。

[0169] Formula 11a: Natural Micellar Water 。

[0170] Formula 12a: Micellar Water 。

[0171] Formula 13a: Skin Tonic 。

[0172] Formula 14a: Scalp Serum 。

[0173] Formula 15a: Micellar Cleansing Foam 。

[0174] Formula 16a: Liquid Facial Cleanser .

[0175] Formula 17a: Two-phase Make-up Remover .

[0176] Formula 18a: Facial Cleansing Gel .

[0177] Formula 19a: Wet Wipe solution ( Wet Wipe solution) .

[0178] Formula 20a Cleansing Bar .

[0179] Formula 21a: Cleansing Cream .

[0180] Formula 22a: Body Wash Peeling .

[0181] Formula 23a: Cleansing Powder .

[0182] Formula 24a: Cleansing Oil .

[0183] Formula 25a: Anti-Transpirant Deo .

[0184] Formula 26a: Mouthwash .

[0185] Formula 27a: Toothpaste .

[0186] Formula 28a: Kitchen cleaning spray .

[0187] Formula 29a: Extra Mild Dish Wash Foam .

[0188] Formula 30a: Automatic Rinse Aid for Direct Use 1 .

[0189] Formula 31a: Automatic Rinse Aid for Direct Use 2 .

[0190] Formula 32a: Automatic Rinse Aid for Direct Use 3 .

[0191] Formula 33a: Glass Cleaner with Optimized Anti-fog Efficiency .

[0192] Formula 34a: Oven Cleanser for Smoking Chamber .

[0193] Formula 35a: All-purpose Cleaner (Microemulsion) .

[0194] Formula 36a: Low-foaming Hard Surface Degreaser .

[0195] Formula 37a: Low-foaming Hard Surface Degreaser (101630-23) .

[0196] Formula 38a: Foaming Hard Surface Degreaser 1 .

[0197] Formula 39a: Foaming Hard Surface Degreaser 2 .

[0198] Formula 40a: Low-foaming Hard Surface Degreaser 3 .

[0199] Formula 41a: Low-foaming Hard Surface Degreaser 4 .

[0200] Formula 42a: Low sudsing hard surface degreaser 4 .

[0201] Formula 43a: Hard surface degreaser from renewable surfactants .

[0202] Formula 44a: High performance floor cleaner .

[0203] Formula 45a: Super natural wash lotion for textile face masks .

[0204] Formula 46: High performance presoak .

[0205] Formula 47a: Presoak (base formula) .

[0206] Formula 48a: Good dispersing presoak .

[0207] Formula 49a: Cost effective presoak .

[0208] Formula 50a: Rinse aid that minimizes water remaining .

[0209] Formula 51a: Rinse aid with optimal oil content .

[0210] Formula 52a: Low sudsing all purpose cleaner .

[0211] Formula 53a: Low sudsing alkaline cleaner .

[0212] Formula 54a: Low sudsing alkaline cleaner .

[0213] Formula 55a: Alkaline cleaner (automatic dishwashing) .

[0214] Formula 56a: Metal cleaner .

[0215] Formula 57a: Metal cleaner .

[0216] Formula 58a: Cost effective exterior wall cleaner .

[0217] Formula 59a: Dust free glass and window cleaner 1 .

[0218] Formula 60a: Dust free glass and window cleaner 2 .

[0219] Formula 61a: Dust free glass and window cleaner 3 .

[0220] Formula 62a: General purpose cleaner concentrate .

[0221] Formula 63a: General purpose cleaner (Cleaner Trigger spray) .

[0222] Formula 64a: Floor cleaner .

[0223] Formula 65a: Bathroom cleaner .

[0224] Formula 66a, 66b, 66c: Hand dishwashing liquid .

[0225] Formula 67a: Plastic furniture and upholstery cleaner .

[0226] Formula 68a: Grill and oven cleaner .

[0227] Formulation 69a, 69b, 69c: Cleaner for Food & Beverage Fatsolve .

[0228] Formulation 70a, 70b: Car wash .

[0229] Formulation 70a, 70b, 70c: Car Rinse .

[0230] Formulation 71a, 71b, Automatic Dishwasher Powder .

[0231] Formulation 72a: Automatic Dishwasher Gel .

[0232] Formulation 73a, 73b, 73c, 73d, 73e, 73f: Laundry pre-spotter .

[0233] Formulation 74a, 74, 74c, 74d: Laundry pre-spotter .

[0234] Formulation 75a, 75, 75c, 75d: Laundry pre-spotter .

[0235] Formulation 76a, 76b, 76c, 76d, 76e, 76f: Laundry Detergent .

[0236] Formulation 77a, 77b, 77c, 77d, 77e, 77f: Laundry Detergent .

[0237] Formulation 78a, 78b, 78c, 78d, 78e, 78f: Laundry Detergent .

[0238] Formulation 79a, 79b, 79c, 79d, 79e, 79f: Laundry Detergent .

[0239] Formulation 80a, 80b, 80c, 80d, 80e, 80f: Laundry detergent .

[0240] Shampoo formulation: Formulation 81: Volume and Body Shampoo .

[0241] Formulation 82: Repair Shampoo .

[0242] Formulation 83: Anti-dandruff Shampoo .

[0243] Formulation 84: Strengthening Shampoo .

[0244] Formulation 85: Shampoo .

[0245] Formulation 86: Moisturizing Shampoo

[0246] Formulation 87: Shampoo .

[0247] Formulation 88: Cleansing Oil Shampoo .

[0248] Formulation 89: Shine Shampoo .

[0249] Formulation 90: Shampoo .

[0250] Formulation 91: Reinforcing Shampoo .

[0251] Formulation 92: Shampoo .

[0252] Formula 93: Fortifying Shampoo .

[0253] Formula 94: Shampoo .

[0254] Formula 95: Brunette Shampoo .

[0255] Formula 96: 2-in-1 Shampoo .

[0256] Formula 97: Shampoo .

[0257] Formula 98: Foam Shampoo .

[0258] Formula 99: Anti-Dandruff Shampoo .

[0259] Formula 100: Shampoo .

[0260] Formula 101: Intensive Care Oil - Shampoo .

[0261] Formula 102: Shampoo .

[0262] Formula 103: Shampoo .

[0263] Formula 104: Shampoo .

[0264] Formula 105: Children's Shampoo .

[0265] Formula 106: Intensive Cream Shampoo .

[0266] Formula 107: Shampoo .

[0267] Formula 108: Caffeine Shampoo .

[0268] Formula 109: Power Grey Shampoo .

[0269] Formula 110: Shampoo .

[0270] Formula 111: Caffeine Shampoo .

[0271] Formula 112: Shampoo .

[0272] Formula 113: Shampoo .

[0273] Formula 114: Volume Shampoo .

[0274] Formula 115: Shampoo .

[0275] Formula 116: Shampoo .

[0276] Formula 117: Shampoo .

[0277] Formula 118: Shampoo .

[0278] Formula 119: Conditioning Shampoo .

[0279] Formula 120: Conditioning Shampoo .

[0280] Formula 121: Conditioning Shampoo .

[0281] Formula 122: Conditioning Shampoo .

[0282] Formula 123: Natural Shampoo .

[0283] Formula 124: Natural Shampoo .

[0284] Formula 125: Natural Shampoo .

[0285] Formula 126: Natural Shampoo .

[0286] Formula 127: Natural Shampoo .

[0287] Formula 128: Natural Shampoo .

[0288] Formula 129: Anti-Hair Loss Tonic .

[0289] Formula 130: Bath Oil .

[0290] Formula 131: Shower Mousse .

[0291] Formula 132: Shower Gel .

[0292] Formula 133: Shower Gel .

[0293] Formula 134: Shower Scrub .

[0294] Formula 135: Cellulose Scrub .

[0295] Formula 136: Exfoliating Body Scrub .

[0296] Formula 137: Dry Clean Shampoo .

[0297] Formula 138: Dry Clean Shampoo .

[0298] Bath Formulas Formula 139: Bath Gel .

[0299] Formula 140: Body Wash .

[0300] Formula 141: Cool Down Bath Gel .

[0301] Formula 142: Bath Gel .

[0302] Formula 143: Bath Gel .

[0303] Formula 144: Body Wash .

[0304] Formula 145: Anti-Aging Body Wash .

[0305] Formula 146: Bath Gel .

[0306] Formula 147: Bath Gel Formula 148: Men's Bath Gel .

[0307] Formula 149: Moisturizing Body Wash .

[0308] Formula 150: Body Wash .

[0309] Formula 151: Body Wash .

[0310] Formula 152: Bath Milk .

[0311] Formula 153: Bath Gel .

[0312] Formula 154: Bath Gel .

[0313] Formula 155: Bath Oil .

[0314] Formula 156: Bath Gel .

[0315] Formula 157: Shower Gel .

[0316] Formula 158: Shower Scrub .

[0317] Formula 159: Cellulose Scrub .

[0318] Formula 160: Exfoliating Body Scrub .

[0319] Formula 161: Washing Powder .

[0320] Formula 162: Washing Powder .

[0321] Formula 163: Powder Cleanser .

[0322] Formula 164: Powder Cleanser .

[0323] Soap Formula Formula 165: Mild Liquid Soap .

[0324] Formula 166: Soap .

[0325] Formula 167: Liquid Soap .

[0326] Formula 168: Cream Soap .

[0327] Formula 169: Liquid Soap .

[0328] Formula 170: Liquid Soap .

[0329] Formula 171: Liquid Soap .

[0330] Formula 172: Cream Soap .

[0331] Formula 173: Jelly Soap .

[0332] Formula 174: Soap .

[0333] Formula 175: Soap .

[0334] Formula 176: Painting Soap .

[0335] Formula 177: Painting Soap .

[0336] Bath Formula Formula 178: Bath .

[0337] Formula 179: Creme Oil Bath .

[0338] Formula 180: Relaxing Good Sleep Bath .

[0339] Formula 181: Pampering Oil Bath .

[0340] Formula 182: Aroma Bath .

[0341] Formula 183: Bath Bomb .

[0342] Formula 184: Bath Bomb .

[0343] Formula 185: Bath Salt .

[0344] Formula 186: Bath Salt .

[0345] All-in-one (x-in-1) formulas Formula 187: Shower Gel and Shampoo .

[0346] Formula 188: Body Wash, Shampoo, and Shaving Cream .

[0347] Formula 189: 2-in-1 Body Wash and Shampoo .

[0348] Formula 190: 2-in-1 Bubble Bath and Wash .

[0349] Formula 191: Body and Face Wash .

[0350] Formula 192: Hair and Body Shampoo .

[0351] Formula 193: After-Sun Hair and Body Shampoo .

[0352] Formula 194: Hair and Body Shampoo & Shower Gel .

[0353] Facial Cleansing Formula Formula 195: Eye Makeup Remover .

[0354] Formula 196: Eye Makeup Remover .

[0355] Formula 197: Micellar Lotion .

[0356] Formula 198: Water-Resistant Eye Makeup Remover .

[0357] Formula 199: Water-Resistant Eye Makeup Remover .

[0358] Formula 200: Micellar Gel .

[0359] Formula 201: Micellar Gel .

[0360] Formula 202: Micellar Makeup Remover .

[0361] Formula 203: Facial Cleansing Foam .

[0362] Formula 204: Facial Cleansing Foam .

[0363] Formula 205: Cleansing Foam .

[0364] Formula 206: Cleansing Foam .

[0365] Formula 207: Cleansing Foam .

[0366] Formula 208: Pump Foam for Facial Cleansing .

[0367] Formula 209: Pump Foam for Facial Cleansing Formula 210: Micellar Water Formula 211: Refreshing Micellar Water Formula 212: Oily Micellar Water .

[0368] Formula 213: Facial Tonic .

[0369] Formula 214: Facial Tonic .

[0370] Formula 215: Facial Tonic .

[0371] Formula 216: Micellar Water .

[0372] Formula 217: Micellar Water .

[0373] Formula 218: Micellar Water .

[0374] Formula 219: Micellar Water .

[0375] Formula 220: Micellar Water .

[0376] Formula 221: Micellar Water .

[0377] Formula 222: Facial cleanser and scrub .

[0378] Microemulsion formula Formula 223: Microemulsion for removing makeup .

[0379] Formula 224: Microemulsion for removing makeup .

[0380] Toothpaste formula Formula 225: Toothpaste .

[0381] Formula 226: Toothpaste .

[0382] Formula 227: Toothpaste .

[0383] Formula 228: Toothpaste .

[0384] Formula 229: Toothpaste .

[0385] Formula 230: Toothpaste .

[0386] Formula 231: Toothpaste .

[0387] Formula 232: Toothpaste .

[0388] Formula 233: Toothpaste .

[0389] Formula 234: Toothpaste .

[0390] Formula 235: Toothpaste .

[0391] Formula 236: Toothpaste .

[0392] Formula 237: Toothpaste .

[0393] Formula 238: Toothpaste .

[0394] Formula 239: Toothpaste .

[0395] Formula 240: Toothpaste .

[0396] Formula 241: Toothpaste .

[0397] Formula 242: Toothpaste .

[0398] Formula 243: Toothpaste .

[0399] Formula 244: Toothpaste .

[0400] Formula 245: Toothpaste .

[0401] Formula 246: Toothpaste .

[0402] Formula 247: Toothpaste .

[0403] Formula 248: Toothpaste .

[0404] Formula 249: Toothpaste .

[0405] Formula 250: Toothpaste .

[0406] Formula 251: Toothpaste .

[0407] Formula 252: Toothpaste .

[0408] Formula 253: Toothpaste .

[0409] Formula 254: Toothpaste .

[0410] Formula 255: Toddler Toothpaste .

[0411] Formula 256: Children's Toothpaste .

[0412] Formula 257: Infant Toothpaste .

[0413] Formula 258: Children's Toothpaste .

[0414] Formula 259: Toddler Toothpaste .

[0415] Formula 260: 2-in-l Toothpaste + Mouthwash .

[0416] Formula 261: 2-in-l Toothpaste + Mouthwash .

[0417] Mouthwash Formula Formula 262: Alcohol-Free Mouthwash .

[0418] Formula 263: Alcohol-Free Mouthwash .

[0419] Formula 264: Alcohol-Free Mouthwash .

[0420] Formula 265: Alcohol-Free Mouthwash .

[0421] Formula 266: Mouthwash .

[0422] Example Formula 267: Alcohol-Free Mouthwash .

[0423] Formula 268: Alcohol-free mouthwash .

[0424] Formula 269: Alcohol-free mouthwash .

[0425] Formula 270: Alcohol-free mouthwash .

[0426] Formula 271: Alcohol-free mouthwash .

[0427] Formula 272: Alcohol-free mouthwash .

[0428] Formula 273: Alcohol-free mouthwash .

[0429] Formula 274: Alcohol-free mouthwash .

[0430] Formula 275: Mouthwash .

[0431] Formula 276: Mouthwash .

[0432] Formula 277: Mouthwash .

[0433] Formula 278: Mouthwash .

[0434] Formula 279: Mouthwash .

[0435] Formula 280: Mouthwash .

[0436] Formula 281: Mouthwash .

[0437] Formula 282: Mouthwash .

[0438] Formula 283: Mouthwash .

[0439] Formula 284: Mouthwash .

[0440] Formula 285: Mouthwash .

[0441] Formula 286: Mouthwash .

[0442] Formula 287: Mouthwash .

[0443] Formula 288: Mouthwash .

[0444] Formula 289: Mouthwash .

[0445] Formula 290: Mouthwash Concentrate .

[0446] Formula 291: Mouthwash Concentrate .

[0447] Formula 292: Mouthwash Concentrate .

[0448] Formula 293: Peroxide Mouthwash .

[0449] Formula 294: Fluoride Gel .

[0450] Formula 295: Fluoride Gel .

[0451] Formula 296: Dental Floss .

[0452] Formula 297: Teeth Wipe .

[0453] Formula 298: Chewing Gum .

[0454] Formula 299: Mouthwash tablet .

[0455] Formula 300: Tooth Tab .

[0456] Formula 301: Toothpaste powder .

[0457] Additional Formulas (in wt%): 。

Claims

1. A composition comprising A) 0.5% to 90% by weight, preferably 3.0% to 85% by weight, even more preferably 15% to 80% by weight, more preferably 25% to 75% by weight, and most preferably 40% to 70% by weight of at least one biosurfactant, and B) Manganese ions ranging from 0.01 ppm to 500 ppm, preferably from 0.1 ppm to 200 ppm, more preferably from 1.0 ppm to 50 ppm, and most preferably from 2.0 ppm to 19 ppm. The weight percentages and parts per million are relative to the total composition.

2. The composition according to claim 1, characterized in that... It contains A) 25% to 75% by weight, more preferably 40% to 70% by weight of at least one biosurfactant, and B) Manganese ions ranging from 0.1 ppm to 500 ppm, more preferably from 0.5 ppm to 50 ppm, and even more preferably from 1.0 ppm to 19 ppm. The weight percentages and parts per million are relative to the total composition.

3. The composition according to claim 1, characterized in that... It contains A) 0.5% to 25% by weight, more preferably 1.0% to 20% by weight, and most preferably 3.0% to 15% by weight of at least one biosurfactant, and B) Manganese ions ranging from 0.01 ppm to 500 ppm, more preferably from 0.5 ppm to 50 ppm, and even more preferably from 1.0 ppm to 19 ppm. The weight percentages and parts per million are relative to the total composition.

4. The composition according to any one of the preceding claims, characterized in that... The biosurfactant is selected from rhamnolipids, glucose lipolipids and sophorolipids, with rhamnolipids and glucose lipolipids being preferred, and rhamnolipids being the most preferred.

5. The composition according to any one of the preceding claims, characterized in that... It contains C) At least one preservative.

6. The composition according to any one of the preceding claims, characterized in that... The preservative is selected from the group consisting of, preferably, the following: p-Methoxybenzoic acid, benzoic acid, levulinic acid, sorbic acid, lactic acid, mandelic acid, salicylic acid, dehydroacetic acid, capryloyl hydroxamic acid, cinnamic acid, geraniic acid, nonanoic acid, and salts of the above acids. Methylparaben, ethylparaben Phenylacetol, benzyl alcohol, phenethyl alcohol, phenoxyethanol Propylene glycol, pentanediol, 1,2-hexanediol, octyl ethylene glycol, undecyl alcohol, methyl propylene glycol, Ethylhexylglycerol, n-octylglycerol, n-heptylglycerol, n-hexylglycerol, methylheptylglycerol Undecenoamamidopropyltrimethylammonium methyl sulfate, Isothiazolinone, Triethyl citrate, Citral Hydroxymethylglycine salt, caprylic acid glyceride, Iodopropynyl butylcarbamate, and Sodium decanoyl / lauroyl lactyl lactylate.

7. A method for stabilizing the color of a composition comprising a biosurfactant, comprising the steps of a) Provide a composition comprising a biosurfactant, and b) Add manganese to the composition to a concentration of manganese ions of 0.01 ppm to 500 ppm, preferably 0.10 ppm to 200 ppm, more preferably 1.0 ppm to 50 ppm, and most preferably 2.0 ppm to 19 ppm, wherein the concentration is based on the total composition in parts per million.

8. The method according to claim 7, characterized in that The manganese is added in the form of manganese oxide and / or manganese salt, preferably as an aqueous solution, wherein the oxide is preferably selected from MnO2, Mn3O4, Mn2O3, MnO, Mn2O7 and MnO3, and the salt is preferably selected from MnSO4, MnCl2, Mn(CH3CO2)2, MnCO3, Mn(NO3)2 and manganese gluconate.

9. The method according to claim 7 or 8, characterized in that... The biosurfactant is selected from rhamnolipids, glucose lipolipids and sophorolipids, with rhamnolipids and glucose lipolipids being preferred, and rhamnolipids being the most preferred.

10. The method according to any one of claims 7 to 9, characterized in that... The composition containing biosurfactants provided in step a) has a Gardner color value of 0.01 to 15, preferably 0.5 to 8, more preferably 1 to 5.

11. The method according to any one of claims 7 to 10, characterized in that... The composition containing biosurfactants provided in step a) has an L color value in the CIELAB color space of 20 to 100, preferably 30 to 95, more preferably 50 to 90.

12. Use of manganese ions to improve the color stability of compositions containing at least one biosurfactant.

13. Use of manganese ions to prevent malodor from compositions containing at least one biosurfactant.

Images