Infant laundry detergent composition based on plant extracts and preparation method thereof

Abstract

The invention relates to the technical field of daily chemical washing products, in particular to an infant laundry detergent composition based on plant extracts and a preparation method of the infant laundry detergent composition. Aiming at the problem that a synergistic effect of cleaning and safety of the infant laundry detergent is lacked in the prior art, the invention provides the following technical scheme: the infant laundry detergent comprises the following components: 0.8%-2.5% of an antibacterial component, 8.0%-13.0% of a surfactant, 0.3%-0.8% of a skin repairing component, 0.5%-1.2% of a builder, 0.1%-0.2% of a thickener, 0.2%-0.3% of a preservative and the balance of deionized water. According to the invention, licorice and dark plum extract are compounded to resist bacteria, a chemical antibacterial agent is replaced, the laundry detergent is more suitable for delicate skin of infants, the irritation risk is reduced, amino acid and ampholytic surfactants are selected, damage to a skin grease layer is avoided, panthenol and allantoin are added to repair the skin, the cleaning efficiency and system stability of the laundry detergent are guaranteed, and the core demand of the laundry detergent for infants is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of daily chemical washing products, in particular to a baby laundry liquid composition based on plant extracts and a preparation method thereof. BACKGROUND

[0002] With the increasing attention of parents to the safety of infant care, baby laundry liquid, as a close-fitting fabric cleaning product, needs to meet the three core demands of adapting to delicate skin, cleaning effectively and safe ingredients. The thickness of the baby's skin keratin layer is only 1 / 3 of that of adults, and the skin barrier function has not yet matured, with very low tolerance to external stimuli, and is prone to redness, dryness, itching and other problems caused by residual ingredients in laundry liquid. Therefore, the mildness and safety of ingredients become the core premise of product design.

[0003] The existing baby laundry liquid has obvious deficiencies: the safety of antibacterial ingredients is insufficient: most products rely on chemical synthetic antibacterial agents to achieve bacteriostatic effect, such ingredients can inhibit bacterial reproduction in the short term, but long-term contact may penetrate the weak skin barrier of infants and young children, posing a potential irritation risk; the selection of surfactants is unreasonable: in order to pursue cleaning power, some products still add sodium dodecyl benzene sulfonate and other sulfate surfactants, such ingredients have strong degreasing power and can easily damage the natural oil layer on the surface of the baby's skin, leading to skin barrier damage and exacerbating dryness and sensitivity problems; even if mild surfactants are used, they are mostly single types, making it difficult to balance cleaning power and mildness; there are limitations in the application of natural ingredients: a few products that claim to contain natural ingredients mostly only add a single plant extract, and the amount is low, lacking the support of synergistic effects for stable efficacy, and not matching repair ingredients for the characteristics of baby's skin, so they cannot achieve the dual effect of cleaning and protection;

[0004] Glycyrrhiza, as a traditional medicinal and edible raw material, its root extract contains active ingredients such as glycyrrhizic acid and glycyrrhetic acid, which have soothing properties in addition to mildness; the citric acid, malic acid and polyphenols in the fruit of Prunus mume can not only help regulate the pH of the system, but also form a synergistic effect with other ingredients to optimize the properties of the laundry liquid. In the prior art, there is no combination of glycyrrhiza extract and Prunus mume extract as core functional ingredients to specifically solve the problem of the synergistic effect of cleaning and safety of baby laundry liquid. Therefore, the present application proposes a baby laundry liquid composition based on plant extracts and a preparation method thereof. SUMMARY

[0005] The purpose of the present application is to solve the problem of the lack of cleaning and safety synergistic effect of baby laundry liquid in the prior art, and to propose a baby laundry liquid composition based on plant extracts and a preparation method thereof.

[0006] In one aspect, the present application provides a baby laundry liquid composition based on plant extracts, comprising the following components by mass percentage:

[0007] antibacterial ingredients 0.8%-2.5%, surfactants 8.0%-13.0%, skin care ingredients 0.3%-0.8%, builders 0.5%-1.2%, thickening agents 0.1%-0.2%, preservatives 0.2%-0.3%, and the balance is deionized water;

[0008] The antibacterial ingredients consist of licorice extract and Fructus mume extract;

[0009] The surfactants consist of sodium lauroyl glutamate and cocamidopropyl betaine;

[0010] The skin care ingredients consist of panthenol and allantoin.

[0011] Optionally, in the antibacterial ingredients, the mass percentage of licorice extract is 0.5%-1.5%, and the mass percentage of Fructus mume extract is 0.3%-1.0%;

[0012] The licorice extract contains glycyrrhizic acid and glycyrrhizic acid, and the Fructus mume extract contains citric acid, malic acid and polyphenols.

[0013] Optionally, in the surfactants, the mass percentage of sodium lauroyl glutamate is 5.0%-8.0%, and the mass percentage of cocamidopropyl betaine is 3.0%-5.0%;

[0014] The sodium lauroyl glutamate is an amino acid surfactant, and the cocamidopropyl betaine is an amphoteric surfactant.

[0015] Optionally, in the skin care ingredients, the mass percentage of panthenol is 0.2%-0.5%, and the mass percentage of allantoin is 0.1%-0.3%;

[0016] The panthenol is vitamin B5 used to promote skin minor wound healing.

[0017] Optionally, the builder is sodium citrate;

[0018] The thickening agent is hydroxyethyl cellulose;

[0019] The preservative is food-grade benzyl alcohol;

[0020] The sodium citrate is used to chelate calcium and magnesium ions in hard water, and the hydroxyethyl cellulose is used to adjust the product viscosity to avoid delamination.

[0021] Optionally, the pH value of the laundry liquid composition is 5.0-6.0.

[0022] In another aspect, the present application also provides a method for preparing a baby laundry detergent composition based on plant extracts, comprising the following steps:

[0023] S1, dissolving thickening agent: add the formula amount of deionized water to the reaction kettle, start stirring, slowly add hydroxyethyl cellulose, stir until completely dissolved, form a transparent solution;

[0024] S2, add surfactant: keep stirring, add sodium lauroyl glutamate and cocamidopropyl betaine in turn, continue stirring until the system is uniform and free of particles;

[0025] S3, compound antibacterial and repair ingredients: reduce the stirring speed, add licorice extract, Fructus mume extract, panthenol and allantoin, stir until the active ingredients are uniformly dispersed;

[0026] S4, adjust the stability of the system: add sodium citrate, stir, then add benzyl alcohol, continue stirring to complete the construction of the preservative system;

[0027] S5, filter and detect: filter the mixed solution through a filter screen, detect the pH value of the system, and observe without stratification or precipitation after standing, to obtain the finished product.

[0028] Optionally, steps S1-S5 are operated in a constant temperature environment of 30-40°C throughout;

[0029] In step S1, the stirring speed is 300-400 r / min, and the stirring time is 15-20 min;

[0030] In step S2, the stirring time is 20-25 min.

[0031] Optionally, in step S3, the stirring speed is reduced to 200-250 r / min, and the stirring time is 15 min;

[0032] In step S4, the stirring time after adding sodium citrate is 10 min, and the stirring time after adding benzyl alcohol is 5-8 min;

[0033] In step S5, the filter screen is a 100-mesh filter screen, when detecting the pH value of the system, if the pH value deviates from 5.0-6.0, adjust it with 0.1% citric acid or sodium hydroxide solution, and the standing time is 30 min.

[0034] Optionally, the raw material for extracting the licorice extract is licorice root, which is prepared by water extraction and alcohol precipitation, and the ethanol concentration is controlled at 60%-70% during the extraction process;

[0035] The raw material for extracting the Fructus mume extract is mature Fructus mume fruit, which is prepared by low-temperature ultrasonic-assisted extraction method, and the extraction temperature is lower than 50°C, and both extracts are filtered through a 0.22 μm microporous filter membrane before being added to the system.

[0036] In summary, the present application includes at least one of the following beneficial technical effects:

[0037] The core antibacterial component of the present application uses natural licorice and Chinese plum extract to replace chemically synthesized antibacterial agents, and the skin irritation test shows no redness and stinging reaction, meeting the safety standards for infant skin; the surfactant is selected from an amino acid type and an amphoteric type complex system, which is free of soap base and sulfate, and has a skin irritation index of less than 0.5;

[0038] Further, the infant clothing commonly causes pathogenic bacteria such as Escherichia coli, Staphylococcus aureus, and Candida albicans to have an inhibition rate of more than 99.0%, and the antibacterial effect can last for 8 hours, reducing the secondary attachment of bacteria; the surfactant complex system can effectively remove stubborn stains such as milk stains, saliva stains, and food residue, and has a cleaning rate of more than 95%;

[0039] Further, through the synergistic effect of panthenol and allantoin, a light and thin protective film can be formed on the surface of the clothing to reduce the friction and irritation of the fabric to the skin after washing; the pH of the system is controlled at 5.0-6.0, which is consistent with the weakly acidic environment of the infant skin, and the skin barrier is avoided from being damaged;

[0040] The preparation process of the present application does not require high-temperature and high-pressure equipment, the operation steps are simple, the reaction conditions are mild, it is suitable for large-scale production, and the cost of each component is controllable, and the cost performance is high;

[0041] In summary, the present application uses licorice and Chinese plum extract to replace chemical antibacterial agents, which is more suitable for the delicate skin of infants and reduces the risk of irritation, selects amino acid and amphoteric surfactants to balance the cleaning power and mildness, avoids damaging the skin lipid layer, adds panthenol and allantoin to protect the skin, and adds sodium citrate and hydroxyethyl cellulose to ensure the cleaning efficiency and system stability, which meets the core needs of infant laundry detergent. DETAILED DESCRIPTION

[0042] The technical solutions of the present application will be described below in a clear and complete manner. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments.

[0043] Embodiment one

[0044] The infant laundry detergent composition based on plant extracts provided by the present application comprises the following raw materials: licorice extract 1.0 kg, Chinese plum extract 0.6 kg, sodium lauroyl glutamate 6.5 kg, cocamidopropyl betaine 4.0 kg, panthenol 0.3 kg, allantoin 0.2 kg, sodium citrate 0.8 kg, hydroxyethyl cellulose 0.15 kg, benzyl alcohol 0.25 kg, and deionized water 86.2 kg.

[0045] A method for preparing a baby laundry detergent composition based on plant extracts, comprising the following steps:

[0046] S1, 86.2 kg of deionized water was added to the reaction kettle, stirred at a constant temperature of 35 DEG C, the stirring speed was 350 r / min, 0.15 kg of hydroxyethyl cellulose was added, and the stirring was avoided to avoid caking, and the stirring was continued for 18 min until the complete dissolution;

[0047] S2, keep stirring, add 6.5 kg of sodium lauroyl glutamate, 4.0 kg of cocamidopropyl betaine in turn, stir for 5 min after adding each component, then add the next one, continue stirring for 22 min until the system is uniform and no particles, and the transparent liquid is light yellow;

[0048] S3, the speed is reduced to 220 r / min, 1.0 kg of glycyrrhiza extract, 0.6 kg of Fructus mume extract, 0.3 kg of panthenol and 0.2 kg of allantoin are added, the extract is diluted into a solution with 5 kg of deionized water in advance and then added, and the stirring is continued for 15 min until the active ingredients are completely dispersed;

[0049] S4, add 0.8 kg of sodium citrate, stir for 10 min; then add 0.25 kg of benzyl alcohol, stir for 6 min, and build a preservative system;

[0050] S5, filter with a 100 mesh filter screen to remove possible small impurities, detect the pH of the system with a pH meter, and the pH is 5.5, which meets the requirements; transfer the solution to a static tank, and keep it at a constant temperature of 35 DEG C for 30 min, observe that there is no stratification and no precipitation, and the finished product is obtained.

[0051] Example two

[0052] The baby laundry detergent composition based on plant extracts provided by the application, the composition raw materials include: glycyrrhiza extract: 1.5 kg, Fructus mume extract: 1.0 kg, sodium lauroyl glutamate: 8.0 kg, cocamidopropyl betaine: 5.0 kg, panthenol: 0.5 kg, allantoin: 0.3 kg, sodium citrate: 1.2 kg, hydroxyethyl cellulose: 0.2 kg, benzyl alcohol: 0.3 kg, deionized water: 82.0 kg.

[0053] A method for preparing a baby laundry detergent composition based on plant extracts, comprising the following steps:

[0054] S1, 82.0 kg of deionized water was added to the reaction kettle, stirred at a constant temperature of 40 DEG C, the stirring speed was 400 r / min, 0.2 kg of hydroxyethyl cellulose was added, and the stirring was avoided to avoid caking, and the stirring was continued for 20 min until the complete dissolution;

[0055] S2, keep stirring, add 8.0 kg of sodium lauroyl glutamate and 5.0 kg of cocamidopropyl betaine in turn, stir for 5 min after adding each component, then add the next one, continue stirring for 25 min until the system is uniform and free of particles, and is a light yellow transparent liquid;

[0056] S3, the speed is reduced to 250 r / min, 1.5 kg of glycyrrhiza extract, 1.0 kg of Fructus mume extract, 0.5 kg of panthenol, and 0.3 kg of allantoin are slowly added. The extract needs to be diluted into a solution with 8 kg of deionized water in advance before being added. Stir for 15 min until the active ingredients are completely dispersed;

[0057] S4, add 1.2 kg of sodium citrate, stir for 10 min; then add 0.3 kg of benzyl alcohol, stir for 8 min, and build a preservative system;

[0058] S5, filter with a 100-mesh nylon filter to remove any small impurities; use a pH meter to detect the pH of the system, which is 5.2, meeting the requirements; transfer the solution to a static tank and place it in a 40°C constant temperature environment for 30 min. No stratification or precipitation is observed, and the finished product is obtained.

[0059] Two commercially available mainstream baby laundry detergents were used as control groups, labeled as "Control A" containing phenoxyethanol antibacterial agent and "Control B" containing honeysuckle single extract;

[0060] The performance of the laundry detergents prepared in Example One and Example Two was verified with Control A and Control B.

[0061] (I) Safety performance test (core indicators: skin irritation, pH value):

[0062] 1. Skin irritation test: According to the "Cosmetic Safety Technical Specification" (2022 edition), 30 healthy volunteers (no history of skin allergies, aged 20-35) were selected. Four groups of samples (Example One, Example Two, Control A, and Control B) were applied to the inner side of the volunteers' forearms (2 cm x 2 cm area). After 24 hours, the patches were removed, and the skin redness and irritation were observed for 48 hours. The irritation index (PCI, 0-4 points, 0 points for no irritation, ≥1 points for irritation) was calculated.

[0063] 2. pH value test: The four groups of samples were diluted 1:10 (sample: deionized water), and the calibrated pH meter was used to measure the pH value at 25°C. Each group was measured in triplicate, and the average value was taken.

[0064] The following data were obtained:

[0065] Table 1 Safety test data

[0066] Sample type Skin irritation index (PCI) 48h skin reaction (number of redness / tingling) pH (after 1:10 dilution) Example 1 0.3 0 / 30 5.5 Example 2 0.2 0 / 30 5.2 Control A 0.8 3 / 30 (slight redness) 6.8 Control B 0.6 2 / 30 (slight redness) 6.3

[0067] From the above data table, it can be seen that the skin irritation index of the laundry liquid prepared in Example 1 and Example 2 is only 0.2-0.3, which is much lower than that of the control group A and the control group B, and no volunteers appear red and swollen, stinging; the pH value is 5.2-5.5, which is close to the weak acidic environment (4.5-6.5) of the baby's skin, while the pH value of the control group is 6.3-6.8, which is easy to damage the skin barrier, proving that the mildness of the composition of the present application is more excellent.

[0068] (II) Anti-bacterial performance test (core indicators: inhibition rate, anti-bacterial durability):

[0069] 1. Inhibition rate test: using inhibition ring method, Escherichia coli, Staphylococcus aureus and Candida albicans were prepared into 10 6 CFU / mL bacterial suspension, and were uniformly coated on the culture medium; sterile filter paper pieces (diameter 6mm) soaked with 4 groups of samples (concentration of original solution) were pasted on the surface of the culture medium, and were cultured at 37℃ for 24h, the inhibition ring diameter (mm) was measured, and the inhibition rate was calculated according to the formula: inhibition rate (%) = (inhibition ring diameter of experimental group-inhibition ring diameter of blank group) / inhibition ring diameter of blank group x 100% (blank group is sterile water).

[0070] 2. Anti-bacterial durability test: the 4 groups of samples were used to wash pure cotton cloth (simulating baby's clothes) according to the standard amount, and after drying, the above-mentioned 3 kinds of bacterial suspension were inoculated, and after 8h, the viable bacteria number on the surface of the fabric was detected, and the viable bacteria reduction rate (i.e. anti-bacterial durability) was calculated.

[0071] The following data were obtained:

[0072] Table 2.1 Anti-bacterial rate test data

[0073] Sample type E. coli S. aureus C. albicans Example 1 99.3 99.5 99.1 Example 2 99.6 99.7 99.4 Control A 98.5 98.8 97.2 Control B 96.3 97.1 95.8

[0074] Table 2.2 Anti-bacterial durability test data

[0075] Sample type E. coli S. aureus C. albicans Example 1 92.5 93.8 91.2 Example 2 94.2 95.5 93.6 Control A 85.3 87.1 82.4 Control B 78.6 80.2 76.9

[0076] From the above data table, it can be seen that the inhibition rate of the 3 kinds of pathogenic bacteria of Example 1 and Example 2 of the present application is 99.1%-99.7%, which is higher than that of control A and control B (95.8%-98.8%); and the 8h anti-bacterial durability (91.2%-95.5%) is significantly better than that of control A and control B (76.9%-87.1%), which shows that the combination of licorice extract and Fructus Mume extract can produce synergistic anti-bacterial effect, and the effect is more persistent.

[0077] (III) Cleaning performance test (core indicator: stain removal rate):

[0078] Simulate common stains of baby's clothes (milk stains, pumpkin puree stains, saliva stains), evenly apply the stains on pure cotton white cloth (5 cm x 5 cm), dry and weigh (recorded as m1); wash with 4 groups of samples according to the standard washing procedure (water temperature 30℃, bath ratio 1:20, washing time 15 min), dry and weigh again (recorded as m2), calculate the removal rate according to the formula: stain removal rate (%) = (m1-m2) / m1x100%, 3 times for each group.

[0079] The following data were obtained:

[0080] Table 3 Cleaning performance test data (stain removal rate, %)

[0081] Sample type Milk stain Pumpkin puree baby food stain Saliva stain Example 1 96.2 95.8 97.5 Example 2 97.0 96.5 98.1 Control A 94.5 93.2 95.3 Control B 92.8 91.5 93.6

[0082] According to the above data table, it can be seen that the removal rates of milk stains, food stains and saliva stains of example one and example two of the present scheme are 95.8%-98.1%, which are slightly higher than those of control A and control B (91.5%-95.3%) in the control group, because sodium lauroyl glutamate and cocamidopropyl betaine are compounded, which ensures the cleaning power on the basis of mildness.

[0083] (Four), stability test (core indicators: low temperature stability, centrifugal stability) 1. Low temperature stability: seal the 4 groups of samples and place them in a-8℃ low temperature box, stand for 72h, take out and restore to room temperature, observe whether there is stratification, precipitation, discoloration.

[0084] 2. Centrifugal stability: place the 4 groups of samples in centrifuge tubes, centrifuge at 3000r / min for 30min, observe whether there is stratification, precipitation.

[0085] The following data were obtained:

[0086] Table 4 Stability test data

[0087] Sample type Low temperature stability (-8°C, 72h) Centrifuge stability (3000 r / min, 30 min) Example 1 No delamination, no precipitation, no color change No delamination, no precipitation Example 2 No delamination, no precipitation, no color change No delamination, no precipitation Control A Slight delamination (a small amount of precipitation at the bottom) No delamination, no precipitation Control B No delamination, no precipitation, no color change Slight delamination (a small amount of floating oil at the top)

[0088] According to the above data table, it can be seen that example one and example two of the present scheme have no stratification and precipitation under low temperature (-8℃) and centrifugal conditions, and the stability is better than that of the control group (control A stratifies at low temperature, control B has floating oil under centrifugal condition), which meets the long-term storage requirements of laundry liquid.

[0089] It can be known from the comparison of the multiple performances of the embodiments and the comparative examples of the present application that the infant laundry liquid composition based on the liquorice extract and the Chinese plum extract of the present application is excellent in the four core indexes of safety, antibacterial property, cleaning property and stability: the skin irritation index is less than 0.5, the pH is 5.2-5.5, the inhibition rate on pathogenic bacteria is greater than or equal to 99.1%, the stain removal rate is greater than or equal to 95.8%, and the low-temperature and centrifugal stability is good. Compared with the commercial control sample, the composition realizes the balance of mildness and non-irritation and high-efficiency antibacterial cleaning through the design of the natural extract compound antibacterial and mild surfactant, and is more suitable for the harsh requirements of infant clothing care, and has the industrialization popularization value.

[0090] The above specific embodiments are only several optional embodiments of the present application, and based on the technical solutions of the present application and the related inspirations of the above embodiments, the person skilled in the art can make various alternative improvements and combinations on the above specific embodiments.

Claims

1. A baby laundry liquid composition based on plant extracts, characterized in that, By mass percentage, the following components are included: antibacterial ingredients 0.8%-2.5%, surfactants 8.0%-13.0%, skin care ingredients 0.3%-0.8%, builders 0.5%-1.2%, thickening agents 0.1%-0.2%, preservatives 0.2%-0.3%, and the balance is deionized water; The antibacterial ingredients consist of licorice extract and Fructus Mume extract; The surfactants consist of sodium lauroyl glutamate and cocamidopropyl betaine; The skin care ingredients consist of panthenol and allantoin.

2. The plant extract based laundry liquid composition for infants as claimed in claim 1 wherein, In the antibacterial ingredients, the mass percentage of licorice extract is 0.5%-1.5%, and the mass percentage of Fructus Mume extract is 0.3%-1.0%; The licorice extract contains glycyrrhizic acid and glycyrrhizic acid, and the Fructus Mume extract contains citric acid, malic acid and polyphenols.

3. The plant extract based laundry liquid composition for infants as claimed in claim 1 wherein, In the surfactants, the mass percentage of sodium lauroyl glutamate is 5.0%-8.0%, and the mass percentage of cocamidopropyl betaine is 3.0%-5.0%; The sodium lauroyl glutamate is an amino acid surfactant, and the cocamidopropyl betaine is an amphoteric surfactant.

4. The plant extract based laundry liquid composition for infants as claimed in claim 1 wherein, In the skin care ingredients, the mass percentage of panthenol is 0.2%-0.5%, and the mass percentage of allantoin is 0.1%-0.3%; The panthenol is vitamin B5 used to promote skin minor wound healing.

5. The plant extract based laundry liquid composition for infants as claimed in claim 1 wherein, The builder is sodium citrate; The thickening agent is hydroxyethyl cellulose; The preservative is food-grade benzyl alcohol; The sodium citrate is used to chelate calcium and magnesium ions in hard water, and the hydroxyethyl cellulose is used to adjust the product viscosity to avoid delamination.

6. The plant extract based laundry liquid composition for infants as claimed in claim 1 wherein, The laundry liquid composition has a pH value of 5.0-6.

0.

7. A process for the preparation of a plant extract based laundry liquid composition for infants as claimed in any one of claims 1 to 6, characterized in that, The following steps are included: S1, dissolving thickening agent: add the formula amount of deionized water to the reaction kettle, start stirring, slowly add hydroxyethyl cellulose, stir until completely dissolved, form a transparent solution; S2, add surfactants: keep stirring, add sodium lauroyl glutamate and cocamidopropyl betaine in turn, continue stirring until the system is uniform and no particles; S3, compound antibacterial and care ingredients: reduce the stirring speed, add licorice extract, Fructus Mume extract, panthenol and allantoin, stir until the active ingredients are uniformly dispersed; S4, adjust system stability: add sodium citrate, then add benzyl alcohol after stirring, continue stirring to complete the preservative system construction; S5, filter and detect: filter the mixed liquid through the filter screen, detect the pH value of the system, and observe without delamination and precipitation, then the finished product is obtained.

8. A process for the preparation of a plant extract based laundry liquid composition for infants as claimed in claim 7, wherein, The steps S1-S5 are operated in a constant temperature environment of 30-40℃; In step S1, the stirring speed is 300-400r / min, and the stirring time is 15-20min; In step S2, the stirring time is 20-25min.

9. A process for the preparation of a plant extract based laundry liquid composition for infants as claimed in claim 7, wherein, In step S3, the stirring speed is reduced to 200-250r / min, and the stirring time is 15min; In step S4, the stirring time after adding sodium citrate is 10min, and the stirring time after adding benzyl alcohol is 5-8min; In step S5, the filter screen is a 100-mesh filter screen, and when the pH value of the detection system deviates from 5.0-6.0, the pH value is adjusted by using 0.1% citric acid or sodium hydroxide solution, and the standing time is 30 min.

10. A process for the preparation of a plant extract based laundry liquid composition for infants as claimed in claim 7, wherein, The licorice extract is prepared by using the licorice root as the extraction raw material and adopting the water extraction and alcohol precipitation method, and the ethanol concentration is controlled to be 60%-70% during the extraction process; The extract of Fructus Mume is prepared by using the mature Fructus Mume fruit as the extraction raw material and adopting the low-temperature ultrasonic assisted extraction method, the extraction temperature is lower than 50℃, and both the two extracts are filtered by a 0.22 μm microporous filter before being added into the system.