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Method of preparing pectin with orange peel

A technology for citrus peel and pectin, which is applied in the field of food additive processing, can solve the problems of large usage, difficulty in obtaining high-quality pectin products, and high comprehensive cost, and achieves low production cost, good pectin quality, and low comprehensive cost. Effect

Inactive Publication Date: 2004-09-08
WUHAN CHEM COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main defect of this process is: in order to reduce the amount of alcohol used in the alcohol precipitation process, the extract must be concentrated in vacuum, and a large amount of impurities (including pigments) that are soluble in water and insoluble in alcohol are enriched in the concentrated solution during the vacuum concentration process. Moreover, pectin molecules are degraded to a certain extent during the vacuum concentration process, making it difficult to obtain high-quality pectin products
However, when removing metal ions in pectin salts, the amount of ethanol used is relatively large, and the amount of ethanol loss is positively related to the amount used, so the overall cost is relatively high

Method used

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  • Method of preparing pectin with orange peel
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Examples

Experimental program
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Effect test

Embodiment 1

[0009] 1. Raw material processing: After pulverizing 1000 grams of dried citrus peels (water content 10-14%, stored for 6 months), soak in clear water for 1 hour, filter off the water, and then rinse with water until the water is basically colorless.

[0010] 2. Acid extraction: put the treated citrus peel powder into water (dry citrus peel powder: water=1:25), add hydrochloric acid, stir under the conditions of pH 1.4~1.6 and temperature 80~85°C, Extract for 50 minutes, and filter to obtain the extract.

[0011] 3. Salt-out: add 0.5 liter of 20% aluminum sulfate solution to the extract while stirring, adjust the pH to 4.0-4.5 with 20-22% ammonia water, let it stand for 30 minutes, press filter, the filter cake is 90% humidity control The aluminum pectin is precipitated, and the filter cake is crushed to a particle size of about 1 mm.

[0012] 4. Desalination:

[0013] ① Dealuminum ion: Put the pulverized aluminum pectin precipitate into 6 liters of 75% ethanol, add 0.3 lite...

Embodiment 2

[0022] In the acid extraction process, if the temperature is increased or the time is prolonged, the yield of pectin can be increased, but the quality of the pectin product is reduced (mainly manifested as: the degree of gelatinization of the pectin product decreases and the color deepens). If the residue after the first acid extraction is extracted again, the obtained pectin product will be of very low quality and basically have no commercial value. Therefore, the more reasonable method to increase the yield of pectin is: in the acid extraction process, do not change the acid extraction conditions, and add pectin co-solvent in the later stage to increase the pectin dissolution rate in the later stage. Examples are as follows:

[0023] 1. raw material processing: with embodiment one

[0024] 2. Acid extraction: put the treated citrus peel powder into water (dry citrus peel powder: water=1:25), add hydrochloric acid, stir under the conditions of pH 1.4~1.6 and temperature 80~8...

Embodiment 3

[0030] The pectin salt precipitate obtained after the salting out of the extract contains a large amount of moisture. Water-insoluble impurities (including pigments), if these water-soluble impurities (especially alcohol-insoluble impurities) are removed before desalination, the quality of pectin products will be improved. Fully compacting the pectin salt precipitate can reduce its moisture content, but it cannot remove a large amount of water-soluble and alcohol-soluble impurities (including pigments) wrapped therein. Therefore, a more reasonable way to purify pectin salt precipitates is to wash with dilute brine solution containing the same metal ions. Examples are as follows:

[0031] 1. Raw material processing: same as Example 1.

[0032] 2. Acid extraction: with example two.

[0033] 3. Salt-out: add 0.5 liter of 20% aluminum sulfate solution to the extract while stirring, adjust the pH to 4.0-4.5 with 20-22% ammonia water, let it stand for 30 minutes, press filter and...

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Abstract

The present invention is method of preparing pectin with orange peel. Orange peel as material is produced into pectin through the steps of material processing, acid extraction, salt separation, desalting and drying. During the production, pectin cosolvent is added in the later acid extraction steps to raise the pectin leaching rate; dilute salt solution is used to wash and purify pectin salt precipitate and raise pectin product quality in the salt separation step; and multistage reflux desalting method with higher initial concentration is adopted during desalting step to lower the use amount and consumption of ethanol. The present invention has the advantages of high pectin product quality, low comprehensive cost, etc.

Description

technical field [0001] The invention relates to the field of food additive processing, in particular to the production process of pectin. Background technique [0002] The more commonly used methods for preparing pectin from citrus peels are: alcohol precipitation and salting out. The preparation of pectin by alcohol precipitation includes the steps of raw material treatment, acid extraction, vacuum concentration, alcohol precipitation and drying. The main defect of this process is: in order to reduce the amount of alcohol used in the alcohol precipitation process, the extract must be vacuum concentrated, and a large amount of impurities (including pigments) that are soluble in water and insoluble in alcohol are enriched in the concentrated solution during the vacuum concentration process. Moreover, pectin molecules are degraded to a certain extent during the vacuum concentration process, making it difficult to obtain high-quality pectin products. The preparation of pectin...

Claims

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Application Information

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IPC IPC(8): C08B37/06
Inventor 王存文王为国吴元欣张俊峰徐汶
Owner WUHAN CHEM COLLEGE