Method for preparing pectin through double-effect combined extraction technology

Abstract

The invention discloses a method for preparing pectin through a double-effect combined extraction technology. The method integrates respective advantages of inorganic acid extraction and resin ion exchange technology extraction, overcomes the disadvantages of long production cycle, low yield, low quality and difficult process control of traditional pectin, has the advantages of high extraction efficiency, energy saving, high yield, small destroys to the molecular chain and the gelling degree of pectin, and simple production control, and is very suitable for large-scale and industrialized production.

Description

technical field [0001] The invention relates to a preparation method of pectin, in particular to a double-effect combined extraction method for preparing pectin. Background technique [0002] At present, the extraction techniques of pectin mainly include: boiling water extraction, dilute acid extraction, ion exchange and so on. [0003] Boiling water extraction method: Boil the plant tissue that can extract pectin directly in water, remove the insoluble residue by centrifugation, and obtain a pectin clarified liquid; this method has low pectin yield, long production cycle, and impure finished product. [0004] Dilute acid extraction method: the water-insoluble protopectin in the peel cells is hydrolyzed into water-soluble pectin in a dilute acid solution. The types of hydrolyzed acids include: inorganic acids such as hydrochloric acid, sulfuric acid, sulfurous acid, etc., organic acids such as acetic acid, Malic acid, tartaric acid, etc., are often used in production to ext...

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Problems solved by technology

[0003] Boiling water extraction method: Boil the plant tissue that can extract pectin directly in water, remove the insoluble residue by centrifugation, and obtain pectin clarified liquid; this method has low pectin yield, long production cycle, and impure finished product

[0004] Dilute acid extraction method: the water-insoluble protopectin in the peel cells is hydrolyzed into water-soluble pectin in a dilute acid solution. The types of hydrolyzed acids include: inorganic acids such as hydrochloric acid, sulfuric acid, sulfurous acid, etc., organic acids such as acetic acid, Malic acid, tartaric acid, etc., are often used in production to extract pectin by first using hydrochloric acid and then ethanol precipitation; disadvantages: the reaction conditions are complicated during the extraction process, and the acid liquid greatly damages the pectin molecular chain, which seriously reduces the pectin quality. degree of gelation and esterification, and this method cannot extract 2+ , Ca 2+ Part of the pectin blocked by metal ions, so that the yield of pectin is also relatively low

[0005] Ion exchange method: it uses the exchangeable ions brought by the functional groups fixed on the three-dimensional network skeleton, and by changing the environmental conditions such as ion concentration, it performs reversible reaction exchange with the adjacent peripheral ions to achieve the purpose of extracting pectin , so that the ions in the extract are exchanged on the resin, and the Mg 2+ , Ca 2+ Pectin blocked by metal ions is transformed into water-soluble pectin; disadvantage: only the 2+ , Ca 2+ The pectin blocked by metal ions is converted into water-soluble pectin, and the yield of pectin is low. This method has mild reaction conditions, long extraction time, large amount of resin, and high production cost.