Preparation of imprinted crosslinked chitosan resin and application thereof in removal of cadmium from pinctada martensii homogenate

Abstract

The invention discloses preparation of an imprinted crosslinked chitosan resin and application thereof in removal of cadmium from pinctada martensii homogenate. The imprinted crosslinked chitosan resin is prepared by the following steps of: preparing a cadmium-citric acid compound; reacting chitosan with the cadmium-citric acid compound to obtain the chitosan resin of the cadmium-citric acid compound, and reacting the chitosan resin and glutaraldehyde to obtain the crosslinked resin of the cadmium-citric acid compound and the chitosan; and soaking and eluting the cadmium-citric acid compound with hydrochloric acid to obtain the cadmium-citric acid molecule imprinted crosslinked chitosan resin. After shells of pinctada martensii are opened, meat is taken out from the shells and the meat is homogenized, the cadmium is extracted from the pinctada martensii homogenate by citric acid complexing; the cadmium-citric acid compound in the extracting solution is absorbed by the imprinted crosslinked chitosan resin; and the cadmium is separated from the meat homogenate through centrifugal filtration and then is removed. Influence on the original nutrient component in the meat homogenate is little. The imprinted crosslinked chitosan resin has the advantages of simple and convenient production method, easily controlled operation process, reproducibility and reutilization, removal rate of the cadmium in the pinctada martensii meat homogenate of 86.15 to 91.23 percent and preservation rate of amino nitrogen of over 95.62 percent.

Description

technical field [0001] The invention belongs to the preparation of an imprinted cross-linked chitosan resin and its application for removing cadmium in the homogenate of Pinctada martensii. Background technique [0002] Pinctada martensi (Pinctada martensi), also known as Hepu pearl oyster, belongs to the mollusk phylum bivalve pearl oyster order pearl oyster family. It is an important marine cultured shellfish and the main mother shell for pearl production. The widest and most abundant shellfish. Mainly distributed in China's Guangxi, Guangdong, and the southern coastal areas of the Taiwan Strait. Seawater pearl cultivation in Guangdong Province alone produces 16 tons of raw pearls per year, and about 4,000 tons of pearl oyster meat (whole organs) after pearling. Pearl oyster meat in the two provinces of Guangxi is quite considerable. [0003] Pearl oyster martensii is rich in nutrients and high in protein content. It has the functions of clearing away heat and detoxifica...

AI Technical Summary

Problems solved by technology

However, as a filter-feeding organism, shellfish have a strong ability to accumulate heavy metals, resulting in excessive heavy metal content in the shellfish meat of Pinctada martensii, among which the cadmium content is as high as 1.17-3.38 μg / g

Due to the concentration effect of heavy metals, the cadmium content of shellfish deep-processing products is often higher than that of shellfish raw materials, which affects the safety of shellfish deep-processing products.

In the past, most of the purification methods to improve the quality of shellfish were aimed at pathogenic microorganisms. There is no effective purification treatment technology for shellfish contaminated by heavy metals. At present, there is no effective method to eliminate heavy metal residues in shellfish raw materials.