A method for extracting lemon peel pectin by salt

Abstract

The invention discloses a method for extracting lemon peel pectin through salt. The method comprises the following steps: adding 400 to 500 kg of lemon peels into a 10-ton tank, adding water with 18 to 20 times of mass thereof and soaking for 15 to 30 min; adding organic acid under the constant-speed stirring situation and treating for 1 to 2 h; adding 20 to 30 kg of mixed salt under the constant-speed stirring situation and treating for 2 to 3 h; separating through centrifugal equipment to obtain liquid; vacuum concentrating the liquid through vacuum equipment and obtaining pectin concentrated liquid. According to the method disclosed by the invention, an acid method and a salt method are combined, so that not only are pectin molecules extracted in high efficiency, but also pectin molecules can keep integrity under the acid condition; organic acid and inorganic acid are mutually matched with each other, so that cellulose crystalline can be cracked more effectively, the pectin molecules can be more effectively dispersed from cell walls, the extracting efficiency is high, and the extracting effect is good.

Description

technical field [0001] The invention relates to the technical field of deep processing of agricultural products, in particular to a method for preparing pectin, in particular to a method for extracting lemon peel pectin with salt. Background technique [0002] Pectin is a natural polymer compound widely present in the cell wall and intercellular layer structure of higher plants. Therefore, the extraction of pectin requires the release of pectin from the cell wall of cellulose. At present, the traditional extraction process of pectin is the boiling water extraction method, which is to boil the extracted raw materials in water to dissolve the pectin, then centrifuge the pectin extract and filter to obtain the pectin clarified solution. This method can only extract part of the water-soluble pectin in the raw material, the yield is low, and the finished product contains various impurities. [0003] Some new pectin extraction methods have been developed in the prior art, mainly...

AI Technical Summary

Problems solved by technology

For example, CN108794651A discloses a method for extracting pectin from the passion fruit peel, specifically discloses that after the passion fruit peel powder is dispersed in water, tartaric acid is added, heated and stirred for extraction, and the pectin extract is obtained after filtration. However, the pectin molecule of this technical scheme is It will be partially decomposed during the extraction process, the yield of pectin is low, and the extraction efficiency is poor

[0004] CN108892741A discloses a method for extracting peach pectin, which specifically discloses that the washed dried peach powder is added to an acetic acid solution for subcritical extraction, and after the extraction is completed, it is filtered to obtain a pectin extract without destroying the pectin structure. This technical solution has high cost and complex process, and is especially suitable for the extraction of pectin in peaches, so it cannot be popularized and applied on a large scale.

This method has high degree of gelation and high molecular weight of pectin, but the process is cumbersome and not suitable for industrial production

[0005] In summary, the prior art still lacks an efficient and low-cost pectin extraction process