Method for preparing k-carrageenan with high gel strength from eucheuma

Abstract

The invention relates to a method for preparing k-carrageenan with high gel strength from eucheuma. The method comprises the following steps of: (1) adding aqueous solution of ethanol into red algae eucheuma, treating under the ultrasonic condition, and draining water from the algae residue; (2) adding alkali modifier into the algae residue, and heating to remove sulfate groups on the C6 site in carrageenan so as to form 3,6-inner ether-galactose; (3) boiling gel: cleaning the algae residue by using tap water, draining water, adding deionized water, boiling the gel, and filtering to obtain carrageenan gel solution; (4) adding macroporous weak alkaline styrene series anion exchange resin into the carrageenan gel solution, decolorizing, and filtering to obtain liquid for later use; and (5) adding a flocculation accelerator into the liquid obtained by filtering, filtering to obtain white gel, performing vacuum drying, and crushing the product obtained by vacuum drying to obtain the k-carrageenan. By the method, the loss of gel is low, the consumption of alkali is greatly reduced, and the water treatment cost and the environmental pollution are reduced.

Description

technical field [0001] The invention relates to a method for extracting κ-carrageenan with high gel strength from red alga Eucheuma, belonging to the field of marine resource processing and utilization. Background technique [0002] Carrageenan (Carrageenan, also known as carrageenan, carrageenan) is extracted from various red algae such as Chondrus, Eucheuma, Gigartina and Hypena A water-soluble colloid, which is one of the world's three major alginate industrial products (agar, carrageenan, and alginate). Carrageenan is a complex mixture of several polysaccharides. It is a linear polysaccharide formed by alternating links with 1,3-β-D-galactopyranose and 1,4-α-D-galactopyranose as the basic skeleton. According to the different positions of the half-ester sulfate group on galactose, it can be divided into seven types. At present, the main types of industrial production and use are κ-(Kappa), ι-(Iota) and λ-(Lamda) There are three types. κ-type carrageenan can form a hard...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a method for preparing high gel strength κ-carrageenan from Eucheuma, which solves the problem of high concentration of alkali treatment in traditional technology, which leads to increased water consumption for cleaning , serious environmental pollution and defects in chemical decolorization methods