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

A technology of cross-linking chitosan and chitosan resin, which is applied in food preparation, chemical instruments and methods, and other chemical processes, and can solve the problem of excessive heavy metal content in Pinctada martensii shellfish, which affects the safety of shellfish deep-processing products However, there is no effective elimination of heavy metal residues in shellfish raw materials, etc.

Inactive Publication Date: 2012-10-03
GUANGDONG OCEAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
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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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Prepare 1 L of cadmium ion solution and citric acid solution with a concentration of 50 μg / ml respectively, mix according to the solution volume ratio of 1:1, adjust the pH to 3 with ammonia water and 1 mol / L hydrochloric acid, and stir for 0.5 h to obtain the cadmium-citric acid complex 12.0g of chitosan and 180ml of cadmium-citric acid complex solution were mixed, stirred for 1 to 2 hours, left to stand at room temperature for 24 to 48 hours, filtered, washed with water until the lotion was not detected by the sodium sulfide method. 2+ Precipitation was rinsed with ethanol and dried at 60°C for 2 hours to obtain chitosan resin of cadmium-citric acid complex; take 3 g of cadmium-citric acid complex chitosan resin, 50 ml of water, and 4.5 ml of glutaraldehyde and mix them evenly. React in a constant temperature water bath at 80°C for 2 hours, filter, wash with water and ethanol in turn, and dry to obtain a resin crosslinked with cadmium-citric acid complex and chitosan; ...

Embodiment 2

[0019] Prepare 1 L of cadmium ion solution and citric acid solution with a concentration of 50 μg / ml respectively, mix according to the solution volume ratio of 1:1, adjust the pH to 4 with ammonia water and 1 mol / L hydrochloric acid, and stir for 0.5 h to obtain the cadmium-citric acid complex Mix 12.0g of chitosan and 200ml of cadmium-citric acid complex solution, stir for 1 to 2 hours, let stand at room temperature for 24 to 48 hours, filter, wash with water until the lotion is not detected by the sodium sulfide method 2+ , the precipitate was rinsed with ethanol and dried at 60°C for 2 to 4 hours to obtain chitosan resin of cadmium-citric acid complex; 3.0 g of cadmium-citric acid complex chitosan resin, 50 ml of water, and 4.5 ml of glutaraldehyde were mixed Evenly, react in a constant temperature water bath at 80°C for 4h, filter, wash with water and ethanol, and dry to obtain a resin cross-linked between cadmium-citric acid complex and chitosan; - Soak elution of citric...

Embodiment 3

[0022] Prepare 1000ml of cadmium ion 50μg / ml solution and 50μg / ml citric acid solution. Mix according to the solution volume ratio of 1: 1, adjust the pH5 with ammonia and 1mol / L hydrochloric acid, stir for 0.5h to obtain the cadmium-citric acid complex; 12.0g of chitosan, 200ml of the solution of the cadmium-citric acid complex are mixed, Stir for 1~2h, stand at room temperature for 24~48h, filter, wash with water until the lotion is not detected by the sodium sulfide method 2+ , the precipitate was rinsed with ethanol and dried at 60°C for 2 to 4 hours to obtain chitosan resin of cadmium-citric acid complex; 3.0 g of cadmium-citric acid complex chitosan resin, 50 ml of water, and 4.5 ml of glutaraldehyde were mixed Evenly, react in a constant temperature water bath at 80°C for 6h, filter, wash with water and ethanol, and dry to obtain a resin cross-linked between cadmium-citric acid complex and chitosan; - Soak elution of citric acid complexes until the eluent and resin are...

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Abstract

The invention relates to an application of cadmium-citric acid imprinted crosslinked chitosan resin for removing cadmium from shellfish. The cadmium-citric acid imprinted crosslinked chitosan resin is prepared by adopting cadmium-citric acid compound as an imprinting molecule and glutaraldehyde as a cross-linking agent. China is a major country of shellfish cultivation and the annual output of shellfish in China takes the first place in the world. However, along with the industrial development, the pollution of heavy metal in the environment is increasingly serious and heavy metal has a stronger ability of enrichment to shellfish, being filter feeders. Therefore, how to remove cadmium from shellfish while maintaining nutritional ingredients at the extreme is necessary to be developed. The cadmium-citric acid imprinted crosslinked chitosan resin provided by the invention is stable in property and has a stronger ability of adsorption to cadmium. Meanwhile, the cadmium-citric acid imprinted crosslinked chitosan resin can be reused and has no effect on the nutritional ingredients of shellfish. In addition, the cadmium-citric acid imprinted crosslinked chitosan resin is non-toxic and biodegradable, which also has the advantages of good mechanical strength, easy separation and the like.

Description

technical field [0001] The invention belongs to the technology for removing cadmium in homogenate liquid of Pinctada martensii, in particular to a method for removing cadmium in shellfish meat by using cadmium-citric acid imprinted cross-linked chitosan resin. 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 pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/26C08J3/24C08L5/08B01J20/24B01J20/28B01J20/30A23L1/33A23L1/015A23L5/20A23L17/40
Inventor 吴晓萍梁鹏章超桦吴育廉杨捷廖艳何碧银王涛
Owner GUANGDONG OCEAN UNIVERSITY
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