380 results about "Insoluble dietary fiber" patented technology

The invention discloses a composite enzyme beverage and a preparation process method thereof. The composite enzyme beverage is prepared from five cereals, fruits and vegetables, edible plants and edible fungi as main raw materials through common fermentation; three-step fermentation is realized by using microzyme, acetic acid bacteria and lactic acid bacteria; and substep fermentation for different strains is adopted at different stages in the manufacturing process, so that the demands of a human body on the efficacies of health and nutrition are met. According to the composite enzyme beverage disclosed by the invention, the mixture ratio of the raw materials is more gentle, more pure natural organic raw materials are used and the three-step fermentation is realized by the microzyme, the acetic acid bacteria and the lactic acid bacteria; and the composite enzyme beverage retains original vitamins and carbohydrate of the fruits and vegetables, is rich in various B-group vitamins and various amino acids, is a nutrient necessary for eliminating the human fatigue and particularly benefits people suffered from chronic disease syndrome. Particularly after coarse grains are fermented, insoluble dietary fibers can be dissolved into small molecular substances which are easily digested and absorbed by the human body, and thus the digestion and intake of nutritive substances by the human body can be enhanced.

The invention discloses a method for extracting fruit dreg dietary fiber through high-pressure microfluidization ultramicro crushing and enzymolysis coupling and belongs to the technical field of agricultural and sideline product waste deep processing. According to the method, water is added into peach dreg for dispersing the peach dreg, the pH is regulated, high-temperature-resistance alpha-amylase and protease are respectively used for enzymolysis for eliminating starch and protein, the peach dreg subjected to the enzymolysis is treated by a high-speed shearing instrument and is subjected to high-pressure microfluidization ultramicro crushing, then, cellulose is added for enzymolysis and centrifugation, filter liquid after enzymolysis and precipitates after enzymolysis are respectively obtained, the filter liquid is subjected to concentration, ethanol precipitation and vacuum drying to obtain high-activity water-soluble dietary fiber, and the precipitates are subjected to water washing and vacuum drying to obtain high-purity insoluble dietary fiber. Waste fruit dreg after the juice squeezing is utilized as raw materials, the fine and deep processing of agricultural and sideline products is realized, and the resource waste is reduced.

The invention provides a diet meal replacement nutrition bar, which contains the following components in percentage by weight: 5 to 10 percent of isomaltulose, 5 to 10 percent of insoluble dietary fiber, 10 to 25 percent of soluble dietary fiber, 10 to 30 percent of egg white powder, 3 to 5 percent of fat and oil, 5 to 20 percent of sugar alcohol, 5 to 10 percent of fruit and 1 to 2 percent of lotus leaf extract. The diet meal replacement nutrition bar has a good taste and the effects of enhancing satiety and dieting, simultaneously does not increase a blood sugar index, is suitable for dieters to eat instead of lunch and supper, and contains a plurality of nutrient components for satisfying the needs of human bodies to achieve nutrition balance.

The invention discloses a preparation method for highly effective compound dietary cellulose. The method of the invention is characterized in that: the highly effective compound dietary cellulose is prepared with the following materials, insoluble dietary fiber, water-soluble dietary fiber, vitamin C and lactic acid bacteria powder, in definite proportions. The product of the invention is the highly effective compound dietary cellulose which is provided with dual characteristics of insoluble dietary fiber and water-soluble dietary fiber and the dosage form of the product can be capsules or granules. The long-term taking of the product of the invention can ensure obvious curative effects on high blood pressure, high blood fat, high cholesterol, diabetes, obesity, constipation, gastro-intestinal diseases, etc. If being added with different materials such as microcrystalline celluloses, magnesium stearate, maltodextrin, citric acid, sodium bicarbonate and PEG6000, according to different preparation forms, the product can also be prepared into tablets, chewable tablets and effervescent tablets. The highly effective compound dietary cellulose of the invention has simple, scientific and reasonable prescription, simple technology and stable quality, and is easy to be produced in large scale, thus being a safe and green health-care food product.

A process for extracting edible fibres from kelp includes such steps as washing, drying and pulverizing raw kelp, enzymolyzing, treating with hydrochloric acid, extracting by sodium carbonate, filter, neutralizing the filtrate, adding calcium chloride to obtain gel, treating the dregs with sodium hydroxide and hdyrochloric acid, mixing the said gel with the treated dregs, bleaching with sodium hypochlorite, activating, dewatering, baking and pulverizing.

The invention relates to a method for extracting kidney bean starch and coproducing kidney bean protein powder and dietary fiber powder. The method comprises the following steps of: firstly, preprocessing kidney bean raw material, grinding into slurry and filtering to obtain filtrate, filter residue on a sieve and residues; secondly, adjusting concentration of the filtrate below the sieve, and carrying out hydrocyclone separation to obtain protein slurry at the upper layer and coarse starch slurry at the lower layer, and washing, dehydrating, drying, smashing and sieving the coarse starch slurry to obtain kidney bean starch; thirdly, carrying out ultrafiltration, ultrasonic treatment and drying on the protein slurry at the upper layer to obtain protein powder; fourthly, adding clear water into filter residue on the sieve and residue, carrying out enzymolysis after ultrasonic treatment, and carrying out filter pressing to obtain filtrate and filter residue; adding clear water into the filter residue, carrying out ultrasonic treatment, cooking, centrifugally separating to obtain supernate and sediment; washing, drying, smashing and sieving the sediment to obtain water-insoluble dietary fiber powder; and mixing the supernate with the filtrate, and carrying out vacuum concentration and drying to obtain water-soluble dietary fiber powder. The method provided by the invention is long in industrial chain, generates no three-waste pollution, and creates outstanding economic benefit.

The invention relates to a seaweed high-activity dietary fiber and a production method thereof; the dietary fiber adopts seaweed slag liquid produced in the production process of seaweed glue as raw material, filter residue and filter liquid in the seaweed slag liquid are respectively taken out, the filter liquid is activated by processing technique, so as to prepare soluble dietary fiber; meanwhile, the filter residue is processed to prepare the insoluble dietary fiber; and then the soluble dietary fiber and the insoluble dietary fiber are formulated to form the seaweed high-activity dietaryfiber. The invention adopts the residual seaweed slag liquid in the production of sodium alginate tech grade and carrageenan as raw material for producing the dietary fiber, thereby greatly reducing the production cost without decreasing the quality of the dietary fiber; in addition, the raw material is respectively prepared in the soluble dietary fiber and the insoluble dietary fiber correspondingly, and the soluble dietary fiber is activated to ensure the expansibility, water-holding capacity and the final yield of the dietary fiber, so as to lead the nutrition in the dietary fiber to be balanced and efficient.

The invention relates to a meal fiber, provides a method for preparing soybean residue water-soluble meal fiber by combining ultrafiltration and spray drying, which comprises: firstly, preparing insoluble soybean residue meal fiber; then, steaming, boiling and the insoluble soybean residue meal fiber, and modifying it by enzymatic hydrolysis; finally, performing ultrafiltration dialysis, concentrating and spray drying. The insoluble meal fiber crude product is prepared by degreasing and deproteinization treatment by using enzyme method and combined alkaline method; additionally, the insoluble meal fiber water-soluble modification is performed by high temperature steaming, boiling and combined cellulose hemicellulose enzymolysis. The combination of high temperature steaming, boiling and enzymolysis modification has the advantages of low enzyme amount, convenience, rapid and high conversion rate of soluble meal fiber; the spray drying performed directly after the ultrafiltration dialysis concentration can avoid the steps of vacuum condensation, alcohol precipitation and drying, saves time, saves process and reduces product cost largely.

The invention belongs to the technical field of fruit and vegetable processing and citrus comprehensive utilization and in particular relates to a preparation method of a ponkan dietary fiber. The preparation method comprises the steps of with ponkan peel pomace as a raw material, carrying out blanching, drying, crushing and ultrasonic-assisted water (microwave assisted water) extraction, carrying out enzymatic hydrolysis, enzyme killing and centrifugation by regulating a pH value and compound enzyme to obtain a filtrate and precipitates, carrying out concentration, alcohol precipitation, alcohol washing, centrifugation and vacuum drying on the filtrate to obtain a water-soluble dietary fiber, and carrying out washing, centrifugation and vacuum drying on the precipitates to obtain a insoluble dietary fiber. With the adoption of the preparation method, with the waste ponkan peel pomace after juicing as the raw material, deep processing of agricultural byproducts raw materials is realized, the resource waste is reduced, and meanwhile, a novel way is provided to comprehensively utilize a ponkan byproduct.

The invention discloses a preparation method for a soluble dietary fiber with apple pomace as a raw material. According to the method, an expanding method and an enzymatic hydrolysis method are combined. By the application of an expansion process, the structures of cellulose molecules become loose, and partial glycosidic bonds are broken, so that partial insoluble dietary fibers are transformed into soluble ones. After separation of the insoluble dietary fibers and the soluble dietary fibers, the expanded insoluble dietary fibers, which have the loose molecular structures, are hydrolyzed by utilizing a cellulase; and then the insoluble dietary fibers are further transformed into soluble dietary fibers. According to the invention, the modification of the insoluble dietary fibers in the apple pomace enables the insoluble dietary fibers to become high-quality soluble dietary fibers, so that an achievement rate of the soluble dietary fibers can substantially be enhanced as well as water binding capacity and expansibility of dietary fibers can also be improved. According to the test, the achieve rate of the soluble dietary fibers can reach 21.2%; the water binding capacity and expansibility can be enhanced by 110.3% and 7.0% respectively.

The invention discloses sugar-free homogenate diet which is characterized by being prepared by mixing the puffing rice meal, puffing corn meal, puffing oat meal, soy protein, controlled-release maltodextrin, dietary fiber, vegetable fat, whole-fat milk powder, egg powder, fish meat powder, carrot powder, isomalt, mineral premix and vitamin prefix. The product disclosed by the invention is rich insoluble dietary fiber as well as insoluble dietary fiber, can obviously slow the digestive absorption of glucose after eating so as to reduce glycemic index, and can obviously improve the intestines and stomach functions and reduce the blood cholesterol level; particularly, the product contains trivalent chromium which plays an important part in regulating glycometabolism and keeping normal tolerance in vivo and also acts on the transphosphorylase in glucose metabolism to prevent and cure diabetes mellitus; and moreover, the carbohydrate of the product is high-molecular carbohydrate such as controlled-release maltodextrin, oats, corn and the like, and sugar alcohol not influencing the blood sugar level is also added.

The invention relates to a method for enzymolyzing wheat bran to prepare asafetida oligosaccharide, wherein it uses wheat bran as raw material; uses enzymatical to remove amidon, remove protein to prepare wheat bran insoluble fiber; then uses bacillus subtilis xylanase to hydrolyze wheat bran insoluble fiber to prepare the asafetida oligosaccharide. And the density of asafetida oligosaccharide will reach 1.497mmol / L. the invention can effectively utilize wheat bran, while prepared asafetida oligosaccharide has significant biological activity, to accelerate the generation of bifidobacteria, and restrain the erythrocyte oxidisability damage indused by free group, with better social and economic benefits.

The invention belongs to the field of functional food ingredient processing and comprehensive utilization of byproducts. The preparation method of high-activity purple sweet potato dietary fiber comprises the following steps: step 1, crudely smashing and filtering waste pigment production dregs of fresh purple sweet potatoes or dried waste pigment production dregs of purple sweet potatoes to obtain a material liquid; step 2, adding a phosphate buffer into the material liquid, regulating the pH of the material liquid to 6.0-6.5, and adding alpha-amylase; step 3, regulating the pH of a substance obtained in step 2 to 4.0-4.5 by using acetic acid, and adding saccharifying enzyme; step 4, regulating the pH of a substance obtained in step 3 to 7.0-7.5 by using sodium hydroxide, and adding neutral protease; step 5, centrifugally separating a substance obtained in step 4, treating liquid supernatant to obtain a soluble dietary fiber product in a first stage; step 6, treating a insoluble dietary fiber precipitate obtained in step 5; step 7, treating a substance obtained in step 6 to obtain a modified dietary fiber product in a second stage; and step 8, combining the soluble dietary fiber obtained in step 5 in the first stage with the modified dietary fiber obtained in step 7 in the second stage, and uniformly mixing the dietary fibers, so as to obtain a final product.

The invention belongs to the technical field of deep processing of cereal byproducts, and particularly relates to modified cereal dietary fiber and a preparation method thereof. The preparation method comprises the steps that cereal husk residues serve as the raw material, dietary fiber is extracted after pretreatment and separation are conducted, and the modified dietary fiber is obtained through a bi-enzyme modification method and an enzyme and ball-milling modification method; high dietary fiber food is obtained by taking the modified dietary fiber as the raw material. The modified cereal dietary fiber and the preparation method thereof are characterized in that a modification treatment technology of the dietary fiber is provided, optimal selection methods comprise the bi-enzyme modification method and the enzyme and ball-milling modification method, water-insoluble dietary fiber is obtained through modification, and water-soluble dietary fiber and the water-insoluble dietary fiber are obtained through refining and drying. According to the modified cereal dietary fiber and the preparation method thereof, cellulase and xylanase are simultaneously utilized to conduct enzymolysis on the cereal dietary fiber, and the content of the water-insoluble dietary fiber in the cereal dietary fiber is significantly increased; the particle size of the cereal dietary fiber is decreased through a mechanical force-enzyme method, the specific surface area is increased, and the enzymolysis effect of compound enzyme on the dietary fiber is improved.

The invention discloses a combined extraction method of different effective active components in citrus peel residues. The method comprises the following steps: 1) carrying out pretreatment on the citrus peel residues; 2) extracting essential oil with a water distilled extraction solvent; 3) extracting pigment with an ethanol solution by the assistance of ultrasonic waves; 4) carrying out acid extraction and ethanol precipitation on pectin; 5) carrying out microwave assisted alkali extraction and acid precipitation on flavonoids; 6) extracting dietary fibers with an acid-base solution. The essential oil, the pigment, the pectin, the flavonoids and the insoluble dietary fibers obtained with the method are high in yield and good in quality, can be widely used in fields of food, medicines, cosmetics and the like, and are further wide in prospects. The method realizes the resource utilization of citrus peel residue waste on the true meaning, and changes waste into valuables, thereby achieving remarkable economic benefits, ecological benefits and social benefits.

The invention belongs to the technical field of deep processing methods of subsidiary agricultural products, and particularly relates to a method for extracting extracting ponkan dietary fibers through extrusion modification and enzymolysis coupling. The method comprises the steps of by taking ponkan hide trimmings as raw material, carrying out hot ironing, drying, grinding, mixing and extrusion modification, adding water for dispersion, adjusting the pH, adding compound enzyme for enzymolysis, carrying out enzyme deactivation and centrifugation to obtain filtrate and precipitate, carrying out concentration, alcohol precipitation, alcohol washing, centrifugation and drying on the filtrate to obtain water-soluble dietary fibers, and carrying water washing, centrifugation and drying on the precipitate to obtain insoluble dietary fibers. According to the method for extracting extracting ponkan dietary fibers through extrusion modification and enzymolysis coupling, the content of the dietary fibers in the ponkan hide trimmings is improved, the functionality of the ponkan hide trimmings is strengthened, meanwhile, a new path is provided for the comprehensive utilization of the ponkan by-products, the deep processing of the subsidiary agricultural products is realized and the resource waste is decreased.

The invention discloses a method for extracting porphyra polysaccharide and porphyra protein, belonging to the technical field for extracting natural active constituents. The method comprises the following steps of: after drying and grinding porphyra, extracting protein and polysaccharide with dilute alkali liquor auxiliary with ultrasonic waves; precipitating the protein in an isoelectric precipitation method, purifying by ultrafiltration, and obtaining a porphyra protein product by spray drying; cleaning residuals after the protein is extracted into neutrality; extracting polysaccharide by dynamic ultrahigh pressure, decolorizing with active carbon, purifying by ultrafiltration, and obtaining a polysaccharide product after spray drying. The method adopts the ultrasonic waves and a dynamic ultrahigh pressure technique to increase the extraction ratio of protein and polysaccharide, and adopts an active carbon decolorizing and ultrafiltration technique to increase the purity of protein and polysaccharide. The residuals after extraction can be cleaned and purified to be prepared into insoluble dietary fiber products, and therefore the porphyra raw material is completely used. The extracted porphyra protein and porphyra polysaccharide have higher bioactivity and can be widely applied in industries, such as biomedicine, cosmetics, food and the like. The economic value and the social benefits of porphyra are improved.

The invention belongs to the technical fields of fruit and vegetable processing and comprehensive utilization of citrus, and specifically relates to a preparation method for extracting edible dietary fiber with high added value from citrus peel residues. According to the present invention, the following key technologies are optimized and screened to determine the extraction method for the dietaryfiber from the citrus peel residues, wherein the key technologies comprise: a pretreatment, fermentation conditions of the soluble dietary fiber, alkali extraction of the insoluble dietary fiber, andother related conditions. The extracted dietary fiber of the present invention maintains the physiological activity to the maximal degree. The extraction rate of the total dietary fiber from the citrus peel residues is 56.23-68.18%, and the purity of the extracted dietary fiber is high, and is 87.59-96.42%.

The present invention relates to a functional fiber flour product for use in foods, beverages, nutritional products and dietary supplements. The invention includes a functional fiber flour product made from oilseeds and comprises soluble and insoluble dietary fibers, polyunsaturated fatty acids, monounsaturated fatty acids, protein, lignans, and low amounts of digestible carbohydrates and saturated fat. Properties of the present invention are useful in enhancing mixing, sheeting, extrusion, baking, frying and roasting characteristics of human food and beverage products and animal feed products without adversely affecting palatability or appearance attributes; properties also include considerable extended shelf life compared to prior art functional fiber products. The present invention also includes a process for making the functional fiber flour product using high pressure and high temperature mixing and extrusion equipment.

The invention discloses insoluble dietary fiber of raisin tree and a preparing method thereof. The raw material is raisin tree fruit or fruit residue thereof after brewing, vinegar production, sugar production, beverage production or active pharmaceutical ingredient extraction. According to the impurity in the raw material and the content, one or a plurality of methods of washing, acid treatment, alkali treatment and decoloring and the like are adopted to remove the impurity, and then dehydrating, drying and superfine grinding are executed. The prepared insoluble dietary fiber of raisin tree is light yellow or ivory powder with the average grain size of 10 to 90 Mum, the content of the insoluble dietary fiber is 50 percent to 100 percent, the retention ability is 1 to 10g / g, the liposuction ability is 1 to 10g / g, the swelling capacity is 1 to 10 mL / g, and the cation exchange resin capacity is 1 to 7 mmoI / g. The insoluble dietary fiber of raisin tree can be used for preparing food, functional food or medicines, or be taken as raw material or auxiliary material of food, functional food or medicines. The method for preparing the insoluble dietary fiber of raisin tree is simple, the production equipment is easily-obtained and has low cost, and the method is suitable for industrialized production.

The invention discloses a preparation method of a pumpkin dietary fiber and the prepared pumpkin dietary fiber. According to the invention, pumpkin pulp is used as a raw material, which is treated with appropriate technology to remove starch and protein, so as to obtain insoluble dietary fiber and water-soluble dietary fiber; and purity of insoluble dietary fiber reaches higher than 85%, and purity of water-soluble dietary fiber reaches 90.5%. The dietary fiber provided by the invention has excellent quality, good water-holding capacity, swelling capacity and oil holding capacity; in addition, the dietary fiber has on sodium nitrite adsorption capacity, cholesterol adsorption capacity and cationic exchange capacity better than soybean dietary fiber on the market, has effects of lowering lipid, reducing weight and preventing cancer of pumpkin effects, and can be used as a functional food ingredient.

The invention discloses a technical method for extracting dietary fiber from pear residue; the pear residue is a waste material produced in the production of pear juice, contains a large number of sclereid, is poor in palatability when direct used as a feed, is a waste of resources and seriously pollutes the environment when use as a waste material; by use of the pear residue for dietary fiber production, the pear industry additional value can be increased, and energy can be saved and emission can be reduced. The technical method comprises the following steps: 1, pear residue pretreatment, 2, ultrasonic assisted enzymolysis, 3, precipitation with ethanol, and 4, drying to obtain pear residue dietary fiber including pear residue soluble dietary fiber and pear residue insoluble dietary fiber; the extraction rate of the pear residue soluble dietary fiber is 13%-15%, at the 20-80 DEG C, the solubility stability of the pear residue soluble dietary fiber is 85% above, the pear residue soluble dietary fiber is strong in antioxidant ability; the pear residue insoluble dietary fiber has good water holding capacity and swelling capacity, and is high-quality dietary fiber. The technical method has the advantages of simple process, short enzymolysis time and low cost, and is suitable for industrial application.

The invention discloses a production method of instant potato rice noodles. According to the invention, whole potato flour is added into rice as a raw material for preparation. Prepared by a specific method, the instant potato rice noodles have rich nutrients, good toughness, fast rehydration, a low broken rate, and higher contents of protein, total sugar, insoluble dietary fibers and minerals of K and Ca than those of common instant rice noodles. The production method enriches nutrients of the instant rice noodles, and improves a sensual quality of the instant rice noodles at the same time. The instant potato rice noodles can not only enrich varieties of instant foods, but also increase varieties of potato staple food production so as to meet demands of modern metropolitan fast-paced people for health and fast food. The instant potato rice noodles prepared by the invention have better toughness, short time of rehydration and a low cooked broken rate. The production method enriches the nutrients of the instant rice noodles, and improves the sensual quality of the instant rice noodles at the same time.

The invention relates to an intestinal health food and a preparation method thereof. A technical problem to be solved is to provide a food for promoting the propagation factor of an intestinal bifidobacterium to increase the number of the intestinal bifidobacterium and promote the intestinal health and a preparation method thereof. The intestinal health food of the invention is prepared from the following raw materials, by weight, 15-35 parts of a soluble dietary fiber, 15-35 parts of an insoluble dietary fiber, 2-6 parts of a xylooligosaccharide, 6-16 parts of a fructooligosaccharide, 10-25 parts of an isomaltooligosaccharide and 3-10 parts of a soy peptide (preferably defatted milk powder and sucralose). The preparation method comprises the following steps: 1, preparing the soluble dietary fiber; 2, preparing the insoluble dietary fiber; 3, mixing; and 4, granulating.

The present invention discloses a method for extracting dietary fibers from sweet potato residues, and belongs to the field of dietary fiber processing. The method comprises the following steps: alkaline cooking, steam explosion, inoculation pulp preparation, ferment preparation, raw material substrate fermentation, insoluble dietary fiber extraction and soluble dietary fiber extraction. The sweet potato residues are used as raw materials to extract the dietary fibers, turning waste into treasure; using both alkaline cooking and steam explosion pretreatments and low-intensity intermittent ultrasonic assisted microbial fermentation and culture can shorten the production cycle; and the extraction rate and purity of the obtained dietary fibers are > 95.6% and 92%, respectively, making the ratio of the soluble dietary fibers of the dietary fibers extracted from the sweet potato residues up to > 19.8%, so that the dietary fibers extracted from the sweet potato residues have a higher water holding capacity and expansibility and a higher physiological activity.

The present invention belongs to the technical field of food processing, and discloses a low-GI high-fiber noodle and a preparation method thereof, wherein the raw materials comprise, by mass, 100 parts of a powder material and 30-45 parts of water, and the components of the powder material comprise 58-92.5 wt% of high gluten wheat powder, 5-30 wt% of oat bran dietary fiber, 1-5 wt% of konjac glucomannan, 1-5 wt% of vital wheat gluten, and 0.5-2 wt% of edible salt. The preparation method comprises: dissolving edible salt into water to obtain salt water, uniformly mixing high gluten wheat powder, oat bran dietary fiber, konjac glucomannan and vital wheat gluten, adding the salt water, making dough for 10-35 min, aging for 15-45 min at a temperature of 10-35 DEG C, preparing noodles from the aged dough, and drying for 15-45 h at a temperature of 20-65 DEG C to prepare the dry noodles. According to the present invention, the low-GI high-fiber noodle has characteristics of smooth taste, no sticking, no muddy soup appearing and oat aroma, can increase the intake of soluble and insoluble dietary fibers, and further has functions of nutrition and health.

The invention relates to a method for extracting water-insoluble dietary fiber of osmunda cinnamomea. The osmunda cinnamomea is mainly processed through an enzyme-chemical integration mode, starch is removed by using alpha-amylase, the protein removing speed of alkali liquor is accelerated, and then protein and fat are removed by using the alkali liquor. An alpha-amylase enzymolysis process and an alkali liquor hydrolysis process are optimized by means of a response surface method and used for extracting the water-insoluble dietary fiber of the osmunda cinnamomea. The method for extracting the water-insoluble dietary fiber of the osmunda cinnamomea facilitates deep processing study of the osmunda cinnamomea, fully utilizes domestic osmunda cinnamomea resources and exploits a new field forprocessing and utilization of the osmunda cinnamomea.

The invention relates to subcritical water extraction on dietary fiber and a preparation method of the dietary fiber, and belongs to the technical field of food processing. The process comprises the following steps: performing pretreatment on raw materials, performing subcritical water extraction, centrifuging, drying, performing superfine grinding, sterilizing and packaging. By adopting the method, soluble dietary fiber and insoluble dietary fiber can be simultaneously prepared. The dissolution rate of the soluble dietary fiber (SDF) is high, after being prepared into superfine powder, the insoluble dietary fiber (IDF) is high in powder porosity and high in containment and has the characteristics of nature, trophism and convenience in bleeding and the like as the dispersity, the solubility and the adsorption of the materials are all fundamentally improved. The dietary fiber prepared by using the method can be used as raw materials, additives, dietary supplement and the like of products of food, beverage, healthcare products, medicines and the like. The production process is clean, an environment-friendly effect is achieved, process is simple and industrialization is easy to achieve.

The invention provides a method for preparing an insoluble tea-leaf dietary fiber. The insoluble tea-leaf dietary fiber is prepared from tea leaves serving as raw materials by drying, coarse grinding, acid treating, alkali treating, degreasing, decoloring, drying and crushing. The insoluble tea-leaf dietary fiber has high intermediate product whiteness, high organoleptic quality and high water holding capacity and expansibility. By utilizing the tea leaves to prepare the insoluble dietary fiber with high activity, the method realizes comprehensive utilization of tea processing and remarkably increases economic value added.