35results about How to "Low degree of esterification" patented technology

The invention belongs to the technical field of plant component extraction, and discloses a method for extracting pectin from waste sisal residues. The method includes the steps of smashing sisal residues, killing enzyme with hot water, conducting extracting through a cellulose compound enzyme solution after degreasing to obtain a sisal residue pectin solution extracted through an enzyme method and solid residues, adding solid residues to an ammonium oxalate solution, conducting ultrasonic extracting to obtain a sisal residue pectin solution extracted through an ultrasonic method, combining and concentrating the sisal residue pectin solution, adding absolute ethyl alcohol for sedimentation, and making sediment sequentially subjected to decoloring through an acid alcohol solution and washing through an ethyl alcohol water solution and vacuum drying to obtain sisal residue pectin. The enzyme method and the ultrasonic extracting method are put forward first so that sisal residue pectin can be extracted; compared with an acid extracting method, an oxalic acid and ammonium oxalate extracting method, a fermentation method and the like in the prior art, the pectin extracting rate is increased to be 30-40% from 10-15%.

The invention discloses a preparation method and application of pectin enzymatic hydrolysis product having functions of dispelling the effects of alcohol and resisting drunk. Constant-temperature enzymatic hydrolysis and de-fatting are performed to polymer high-fat pectin by pectin esterase and pectinase, filtrate is subjected to alcohol precipitation and alcohol leaching after product is filtered to obtain high-purity product, and the high-purity product is subjected to vacuum drying and crushing and screening to obtain pectin enzymatic hydrolysis product having excellent effects of dispelling the effects of alcohol and resisting drunk. Esterification degree and molecular weight of the pectin are reduced by enzymatic hydrolysis and de-fatting of the pectin, the effects of dispelling the effects of alcohol and resisting drunk of product are enhanced by the pectin compared with by the raw materials. Pectin is deeply developed and utilized, additional value of the pectin is convenient to increase, and application range of pectin is broadened. The enzymatic hydrolysis product has high effects of dispelling the effects of alcohol and resisting drunk and can be used as alcohol-effect-dispelling and drunk-resisting components to be applied to the field of medicine and food.

The invention discloses a mixed acid, a decoloring method and a pectin extraction method. The mixed acid comprises concentrated hydrochloric acid and carbonic acid, the dosage volume ratio of concentrated hydrochloric acid to carbonic acid ranges from 1:5 to 3:1, and the pH value is between 0.5 and 3.0. The decoloring method comprises the following steps: carrying out sample loading on a total pectin extracting solution by using a wet process, and decoloring through a column chromatography using a macroporous resin AB-8 filler; controlling the temperature of upper cylinder liquid between 30 DEG C and 40 DEG C, the pH value of the upper cylinder liquid between 4 and 6, and the flow rate of the upper cylinder liquid between 3 BV / h and 5 BV / h. The pectin extraction method comprises the following steps: treating raw materials by adopting steam explosion; applying the mixed acid to carry out acid extraction on the raw materials to obtain an original extract; extracting to obtain pectin after decoloring by using the decoloring method. According to the pectin extraction method, the mixed aid is applied, and thus the extraction ratio is high, and the pectin quality is good; the decoloring method is applied, and thus the adsorption rate is high, and the pectin loss ratio is low; in general, the method is low in pollution, high in yield and easy to popularize.

The invention discloses a preparation method of an ultralow-molecular-weight pectin rich in RG-I. The preparation method comprises the steps that Fe<3+> generated in a reaction system is reduced into Fe<2+> through ultrasonic oxidation reaction, re-reaction between the Fe<2+> and hydrogen peroxide is strengthened to produce hydroxyl free radicals, oxidative cleavage of pectin carbohydrate chain is caused, and galacturonic acid in special attack pectin forms the low-molecular-weight pectin rich in RG-I structural domain. The weight-average molecular weight of the pectin is 5-10 kDa, esterification degree is reduced, the product is the ultralow-molecular-weight pectin rich in RG-I, the antioxidant activity is remarkably higher than that of original pectin, and the comprehensive utilization rate is improved.

The present invention provides a preparation method for cellulose carbamate fiber tow for cigarette. According to the method, cellulose carbamate with a viscosity-average molecular weight of 48000-100,000 and a nitrogen content of 0.1wt%-7.0wt% is dissolved in a mixed aqueous solution of sodium hydroxide and zinc oxide to give a spinning solution with a certain concentration; and by using a wet spinning technique for spinning, and a mixed solution of sulfuric acid, sodium sulphate and zinc sulphate as a regeneration bath, the cellulose carbamate fiber tow for cigarette is obtained from the spinning solution through several processes of spinning -spinning oil applying- drafting- crimping-drying. The filter rod produced by using the tow of the invention has obvious filtering effect on harmful substances in smoke, and can be used in cigarette to replace cellulose acetate fiber tow and acrylic fiber tow.

The invention discloses a method for preparing pectin disaccharides and pectin trisaccharides. The high-yield pectin can be realized by coupling low-ester pectin with hydrothermal treatment at 100-140°C and selective enzymatic hydrolysis of endopectinase. Preparation of Glycobiose and Pectotriose. The test results show that the yield of pectin disaccharide and pectin trisaccharide in this method is much higher than that of hydrothermal or enzymatic degradation of low-ester pectin alone. At the same time, this method is also environmentally friendly, clean and easy to industrialize. , has good practicability.

The invention belongs to the technical field of bioactive polysaccharide preparation, and discloses a device for modifying pectin by dielectric barrier discharge cold plasma, comprising: a first control room, a solution preparation room, a cold plasma treatment room, a drying room and a second connected in sequence. Two control rooms, wherein: the first control room is used to control the solution preparation room to prepare a uniform pectin solution with a specified concentration; the solution preparation room is provided with a first electric stirrer, and the uniformly stirred pectin solution flows to the cold plasma through a control valve body processing chamber; the cold plasma chamber includes a cold plasma generating device, a filter screen and a second electric stirrer, the cold plasma processing chamber is connected with a second control chamber, and the second control chamber is used to control the cooling in the cold plasma processing chamber The working parameters of the plasma generator and the lifting filter. The modified pectin device of the invention has the advantages of greenness, safety, high efficiency, low cost and the like. The invention also provides a method for modifying pectin by dielectric barrier discharge cold plasma.