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

The invention belongs to the technical field of biologically active polysaccharide preparation, and discloses a preparation method of modified pectin. The preparation method comprises the steps that pectin is added into deionized water, mixing and ultrasonic dispersion are conducted, stirring is conducted to be dissolved to be uniform, and a pectin solution is obtained; the pH value of the pectin solution is adjusted with alkali to range from 7 to 12, hydrogen peroxide is dropwise added, under ultraviolet irradiation, stirring is conducted at room temperature, and reacting is conducted; after reacting is completed, the pH of reaction liquid is adjusted with acid to be neutral, the adjusted reaction liquid is added into an ethanol-water solution, and stirring, standing settling and filtering are conducted; a solid product is subjected to washing, drying and purifying, and the modified pectin is obtained. Accordingly, by means of an ultraviolet photocatalysis-hydrogen peroxide oxidation modification method, degradation and degreasing of the pectin can be achieved through one step, and the preparation method has the advantages of being short in reaction time, free of pollution, high in product recovery rate and low in energy consumption.

The present invention provides one kind of ultra heavy denier flat cross section filament with 10-20 monofilaments, monofilament fineness of 60-120 D and twist number of 90-110 twist / m, and its production process. The flat cross section filament, also named as imitation linen filament, is one new type of Vicat fiber produced through a special process and with flat cross section. It has excellent performances of both Vicat fiber and hemp fiber, and possesses high marketability.

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 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 method for extracting citrus pectin by using compound enzyme. The method comprises the following steps: mixing pretreated citrus peel powder with water, adjusting the pH value to 3.5-6.0, adjusting the temperature to 35-60 DEG C, adding compound enzyme, and performing leaching reaction in a constant-temperature magnetic stirrer to obtain citrus pectin powder, wherein the compound enzyme is composed of cellulase, xylanase and acid protease, the pectin yield of the compound enzyme is 22.25%, the pectin yield is improved by 18.4-41.7% compared with that of single enzyme extraction, and the galacturonic acid content reaches up to (83.1+ / -0.7)%. According to the invention, the method is simple and convenient to operate, mild in extraction condition, low in energy consumption and small in pollution, the esterification degree of the extracted citrus pectin is smaller than 50%, and the citrus pectin is low-ester pectin, has better rheological property, emulsifying property and gelling property and can be widely applied to low-sugar and low-calorie food.

The invention relates to a preparation method of low-molecular-weight pectin hydrolyzate, belonging to the technical field of functional sugars. The preparation method comprises the following main processes: adding pectin powder into a 1.0mol / L-10.0mol / L acid solution at one time or dispersing the pectin powder into the 1.0mol / L-10.0mol / L acid solution in several times until the final pectin concentration is 1%(w / v)-30%(w / v), stirring for reaction at 20-100 DEG C for 0.5-12 hours, adjusting the pH of a reaction system to be neutral, carrying out ultrafiltration desalination at a molecular weight cut-off of 1000Da-3000Da so as to obtain pectin hydrolysate, degrading the pectin hydrolysate for 0.5-240 minutes by virtue of pectinase, and drying, so as to obtain pectin hydrolyzate; and furthermore, adsorbing the pectin hydrolyzate by virtue of anion-exchange chromatography after enzymolysis of the pectinase, and sequentially carrying out elution by virtue of pure water, 0.05mol / L NaCl and 0.10mol / L NaCl, so as to respectively obtain a neutral pectin segment, a high-RG-content pectin segment and a high-HG-content pectin segment.

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 relates to a horseradish sauce. The horseradish sauce contains 10-30 parts of brewed soy sauce, 1-5 parts of lemon juice, 1-10 parts of fruit vinegar, 1-10 parts of fructose syrup, 5-15parts of horseradish, 5-10 parts of wasabi, 0-5 parts of salt, 1-10 parts of a dispersant, 1-10 parts of a fresh strengthening agent, 1-2 parts of mustard extract, 1-10 parts of pectin, and 20-40 parts of water. According to the technical scheme, the horseradish sauce is rich and translucent in color, the components synergistically enhances the taste, the horseradish sauce is fresh and pungent andhas a palatable flavor, the dynamic property meets the demand, and suitable adhesion can be provided.

The invention discloses a method using an ammonium exchange method to prepare low-methoxyl pectin. The method is characterized in that ammonium acetate is added into a high-methoxyl pectin solution and the reaction condition is strictly controlled to prepare the low-methoxyl pectin. Compared with a traditional alkaline hydrolysis method, the method has the advantages that the reaction is performed under a neutral condition, the beta elimination reaction is avoided, and pectin molecular weight is unaffected; in addition, the method is mild in reaction condition, simple in process flow, low in production cost, and the like.

The invention discloses an enzymatic hydrolysis preparation method of low molecular weight pectin. Use one or more of pectinase, cellulase, galacturonidase and pectin esterase to enzymatically hydrolyze and deesterify high-molecular-weight high-ester pectin, and the product is neutralized with lye, filtered and dried, and ground Finally, the pectin product with target molecular weight and esterification degree is obtained. The invention adopts the multi-enzyme composite hydrolysis technology to hydrolyze the high-molecular-weight high-ester pectin, and extracts pectin with different molecular weights and esterification degrees, high galacturonic acid content and high-quality taste from natural pectin. The low-molecular-weight pectin powder obtained by the preparation method conforms to the USP30 standard, avoids the existence of various accidental components in the prior art, and improves the purity and success rate of low-molecular-weight pectin extraction; at the same time, the method has a short process flow and industrial It has strong transformation ability and is suitable for large-scale promotion.

The invention relates to a production technology of pulp, in particular to a technology for producing amygdalus communis peel pulp by using a compound enzyme. According to the technology, lipase, lysozyme, pectinase, feruloyl esterase, aldolase, laccase, xylanase, arabinose isomerase, cellulase and dextranase are mixed into the compound enzyme, and after amygdalus communis peel is subjected to pulping, the compound enzyme is added, and even stirring and mixing are conducted. Then, chlorine is introduced for chlorination, and the pulp is bleached through sodium hypochlorite, subjected to acid treatment through hydrochloric acid, finally conveyed to a concentrator for concentration and then subjected to pulping through a pulper for obtaining the amygdalus communis peel pulp. The obtained amygdalus communis peel pulp is good in quality, high in viscosity, high in polymerization degree, natural and free of pollution, by adding the compound enzyme, interference of hemicellulose, lignin, pectic substances and the like is avoided, and normal operation of the technology is guaranteed.

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 invention discloses a preparation method of baits for fishes and belongs to the field of feed. Through acid-base modification of apple pectin, apple pectin can generate shorter carbohydrate chainswith fewer branches in order to reduce the molecular mass and esterification degree of apple pectin, improve the water solubility and increase the content of galacturonic acid, so that the biologicalactivity and functions of apple pectin are better shown; bonding among nutrient substances of the baits can be enhanced, the decomposition rate is reduced by sprinkling the baits into water, the situation that feed for luring fishes are dispersed after dissolution in water and not eaten by fishes is avoided, the effective utilization rate of the baits is increased, and fishes are better harvested. By means of the preparation method, the problems that current baits for fishes are poor in palatability and have no special fragrance and therefore the effect of luring fishes is poor are solved.

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 belongs to the technical field of bioactive polysaccharide preparation, and discloses a device for modifying pectin through dielectric barrier discharge cold plasma. The device comprises a first control chamber, a solution preparation chamber, a cold plasma treatment chamber, a drying chamber and a second control chamber which are connected in sequence, wherein the first control chamber is used for controlling the solution preparation chamber to prepare a uniform pectin solution with specified concentration; the solution preparation chamber is provided with a first electric stirrer, and the pectin solution which is uniformly stirred and dispersed flows to the cold plasma treatment chamber through a control valve; the cold plasma chamber comprises a cold plasma generating device, a filter screen and a second electric stirrer, wherein the cold plasma processing chamber is connected with the second control chamber, and the second control chamber is used for controlling working parameters of the cold plasma generating device in the cold plasma processing chamber and lifting the filter screen. The pectin modifying device has the advantages of being green, safe, efficient, low in cost and the like. The invention further provides a method for modifying the pectin through dielectric barrier discharge cold plasma.

The invention discloses a water-soluble soybean polysaccharide degreasing method and a product thereof. The method comprises the following steps: preparing a solid base catalyst MgO; preparing a water-soluble soybean polysaccharide extract; and putting the solid alkali MgO into the water-soluble soybean polysaccharide extract, carrying out mixing and continuous stirring, transferring the obtainedsolution into a reaction kettle, heating to react for 1-7 h at the temperature of 80-120 DEG C, taking out the reacted solution, centrifuging at a high speed, taking the obtained supernatant, carryingout vacuum concentration, adding absolute ethyl alcohol of which the volume is 10-15 times that of the obtained concentrated solution into the obtained concentrated solution, centrifuging at 6500 r / min for 15min, taking the obtained precipitate, and drying the precipitate so as to obtain the degreased water-soluble soybean polysaccharide. The invention aims to reduce the defects of the soybean polysaccharide alkaline degreasing process, provides a novel SSPS degreasing process, reduces the esterification degree of SSPS, improves the actual utilization value of soybean polysaccharide, and overcomes the defects of SSPS with high esterification degree in the food industry.

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.