Continuous extraction method of pectin, tannin and pigment from persimmon exocarp

An extraction method and technology of persimmon skin, applied in the field of extracting active ingredients, can solve the problems of waste of resources, pollution of the environment, etc., and achieve the effect of removing protein, rich sources, and strong operability

Inactive Publication Date: 2009-03-11
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the utilization of persimmon skin at home and abroad is mainly aimed at the extraction and application of pectin, and there are few reports, while the extraction of tannins and carotenoids from persimmon skin has

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1. Pretreatment of persimmon skin: select persimmon skin without mold, dry it at 60°C after cleaning, and crush the persimmon skin until the diameter is less than or equal to 2mm.

[0014] 2. Leaching:

[0015] a. Beating and squeezing juice: add deionized water with a material-to-liquid ratio of 1:15 according to the actual weight of the persimmon skin, soak for 1 hour at 80°C-90°C, then beat into pulp, and put the beaten pulp into pulp. Put it into a press and press to obtain extract and slurry.

[0016] B, secondary extraction of slurry: add the deionized water that solid-liquid ratio is 1: 10 in the slurry of once leaching, adjust pH value with 1% (mass fraction) hydrochloric acid to be 4.5--5, at temperature Heat preservation and cooking at 80°C-90°C for 40-50 minutes, and pressing to obtain the extract and the slurry after secondary extraction.

[0017] 3. Ultrafiltration membrane filtration: filter the above extract with ultrafiltration membrane, because the re...

Embodiment 2

[0021] 1. Pretreatment of persimmon skin: select persimmon skin without mold, dry it at 60°C after cleaning, and crush the persimmon skin until the diameter is less than or equal to 2mm.

[0022] 2. Leaching:

[0023] a. Beating and extracting squeezed juice: add deionized water with a material-to-liquid ratio of 1:15 according to the actual weight of the persimmon skin, soak for 2 hours at a temperature greater than or equal to 70°C and less than 100°C, and then crush it into pulp The crushed pulp is put into a press and squeezed to obtain the extract and the once-extracted pulp.

[0024] B, secondary extraction of slurry: add the deionized water that solid-liquid ratio is 1: 10 in the slurry of once leaching, adjust pH value with 1% (mass fraction) hydrochloric acid to be 3-5, at temperature Heat preservation and cooking at 70°C-90°C for 40-50 minutes, and press to obtain the extract and the pulp extracted twice.

[0025] 3. Ultrafiltration membrane filtration: Use an ultr...

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Abstract

The invention discloses a continuous extraction method for pectin, tannin and pigment in a persimmon pericarp, which comprises the following steps: a. after the persimmon pericarp is pretreated, the pretreated persimmon pericarp is extracted by water at a temperature which is more than or equal to 70 DEG C and is less than 100 DEG C to obtain an extract and pulp stock; b. the extract is filtered by an ultrafiltration membrane with a cutoff molecular weight of between 10000 and 30000, the trapped part is a pectin liquid, a filtrate is absorbed and separated by a macroporous resin to obtain the tannin; and c. the pulp stock obtained in step a is extracted by acetone at a temperature of between 60 and 70 DEG C, and an extraction liquid is filtered, distilled and dried to obtain the pigment. The method has rich sources of raw materials, is simple, and is more suitable for large-scale industrial production; a used reagent has lower price, small toxicity, and strong maneuverability, and is easy to amplify the technology, and the cost is lower than extraction cost of corresponding products at present. A product extracted by the method is safe and nontoxic, and has simple and reasonable production technology.

Description

technical field [0001] The invention relates to a method for extracting active ingredients from persimmon skin, in particular to a continuous extraction method for pectin, tannin and pigment in persimmon skin. Background technique [0002] As a by-product of persimmon deep processing, persimmon skin accounts for about 10-15% of the total weight of persimmons. Modern medical research shows that: persimmon skin contains more dietary fiber and pectin substances, which have a good effect on promoting human digestion and improving intestinal function, and pectin has a special role in stabilizing protein-containing beverages such as milk protein. The effect of avoiding aggregation due to the interaction between protein particles. The extracted pectin can be sold as a commodity, and can also be transformed into raw materials for producing jelly and pectin jelly on site. [0003] Persimmon fruit is very rich in carotenoids and their fatty acid esters. Carotenoids are used as natur...

Claims

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Application Information

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IPC IPC(8): C08B37/06C09B61/00C07G17/00C07D311/62
Inventor 王继芝
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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