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Pectin and extraction method and preparation method thereof

An extraction method and pectin technology, applied in the field of pectin and its extraction method and preparation, can solve the problems of alcohol consumption, large volume, serious membrane pollution, etc., achieve effective concentrated concentration, solve the problem of heavy color, and reduce membrane pollution Effect

Active Publication Date: 2020-06-30
HEILONGJIANG BAYI AGRICULTURAL UNIVERSITY
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the ethanol precipitation method consumes a large amount of alcohol (2 to 3 tons of alcohol per ton of finished pectin on average). Big
At present, the vacuum concentration method is often used to increase the concentration of pectin extract. Although some researches use ultrafiltration membrane technology to concentrate, the membrane pollution is very serious, and the membrane flux is small, which cannot achieve the effect of effectively concentrating the acidic pectin extract. Value
[0004] Therefore, in the prior art, there is a technical problem that the pectin extract cannot be effectively concentrated by membrane, so that it needs to consume a large amount of alcohol and salt for alcohol precipitation or salting out, and the quality of the obtained pectin is also poor.

Method used

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  • Pectin and extraction method and preparation method thereof
  • Pectin and extraction method and preparation method thereof
  • Pectin and extraction method and preparation method thereof

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[0023] A kind of pectin provided by the present invention and its extraction method and preparation method are described in detail below. Some embodiments of the present invention provide a method for extracting pectin, which includes: adding organic weak acid salts to the acidic pectin extract obtained after extraction of pectin raw materials The acid-treated extract was subjected to membrane filtration. Wherein, the addition amount of the weak organic acid salt in the mixed solution is 0.2-1 mg / mL, and optionally, the addition amount is 0.2-0.25 mg / mL.

[0024] Pectin has a large number of carboxyl groups, generally in the peel through Mg 2+ , Ca 2+ The pectin is connected into a macromolecule, which is insoluble in water. After being hydrolyzed with an acidic solution such as hydrochloric acid, on the one hand, the carboxylic acid group on the pectin is converted into H + Type, that is, become a real carboxylic acid, it is soluble in water. At the same time CaCl 2 The ...

Embodiment 1

[0069] (1) Citrus peel pretreatment

[0070] Wash the fresh citrus peel to remove the impurities on the surface of the peel, and keep it in water at 90°C for 8 minutes to inactivate the pectinase. The citrus peels after deactivation are dried in an oven at 60°C to constant weight, crushed to 100-200 mesh, and set aside.

[0071] (2) Extraction of citrus pectin

[0072] Wash the treated citrus peel powder three times with 70°C deionized water, add deionized water and 0.2M hydrochloric acid solution at a ratio of 1:20 to liquid, adjust the pH to 2.2, and conduct a water bath at 85°C for 80 minutes , During the water bath process, it should be continuously stirred to make it evenly heated, and the solid and liquid should be separated by centrifugation at a centrifugal speed of 3500r / min. The supernatant is the acidic pectin extract.

[0073] (3) Weak organic acid salt treatment

[0074] Sodium citrate was added to the acidic pectin extract to mix evenly, and stirred for 4 minu...

Embodiment 2-4

[0078] The only difference between Examples 2-4 and Example 1 is that the ultrafiltration membranes are sequentially selected from PES 10kDa, PES 30kDa, and PES 100kDa.

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Abstract

The invention discloses pectin and an extraction method and a preparation method thereof. The extraction method comprises the steps: adding organic weak acid salt into an acidic pectin extracting solution, uniformly mixing, carrying out membrane filtration on the extracting solution treated by the organic weak acid salt, carrying out alcohol precipitation or salting-out on the extracting solution,and separating to obtain the pectin, wherein the addition amount of the organic weak acid salt in the mixed solution is 0.2-1 mg / mL. Due to the fact that a proper amount of organic weak acid salt isadded before membrane filtration, pectin colloid is further stabilized, pectin is not prone to precipitation on the surface of a membrane during membrane concentration, meanwhile, pigments, saccharides, calcium, magnesium and other salts in the pectin can be removed, the membrane flux can be increased, and membrane pollution is effectively relieved. Besides, in the salting-out process, low-valencesalt can be used as a precipitating agent, complexing of high-valence cations in a salt solution and the pectin is avoided, pectin desalination is easy to carry out, and thus the problems that pectinis low in extraction rate, heavy in color and low in purity are solved, and the ash content of the pectin is not high.

Description

technical field [0001] The invention relates to the technical field of pectin preparation, in particular to a pectin and its extraction method and preparation method. Background technique [0002] Pectin is a natural polymer substance composed of galacturonic acid. It is used as a gelling agent and thickener in the food industry and pharmaceutical industry. The world demand is increasing year by year. For example, citrus peel contains a large amount of pectin (about 25%), and a large amount of discarded citrus peel waste is produced every year in my country, so extracting pectin from citrus peel waste is an effective method for rational utilization of resources. [0003] At present, in the pectin extraction process, the traditional acid extraction method is still used, but the yield of pectin extracted by the traditional acid method is generally low, and the addition of sodium hexametaphosphate in the acid extraction process produces a large amount of Phosphorus wastewater ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/06
CPCC08B37/0048
Inventor 金丽梅高宇左锋
Owner HEILONGJIANG BAYI AGRICULTURAL UNIVERSITY
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