A method for removing cadmium from dried small fish by using chitosan nano-microspheres

A technology of chitosan nano and small dried fish, which is applied in the field of food processing, can solve the problems of increasing cancer risk and toxicity, and achieve the effects of improving quality and edibility, improving adsorption efficiency, broad market prospects and application value

Active Publication Date: 2021-01-12
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of epidemiological studies have shown that cadmium has strong toxicity to the kidney and urinary system, and at the same time increases the risk of lung cancer, breast cancer, pancreatic cancer and other cancers

Method used

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  • A method for removing cadmium from dried small fish by using chitosan nano-microspheres
  • A method for removing cadmium from dried small fish by using chitosan nano-microspheres
  • A method for removing cadmium from dried small fish by using chitosan nano-microspheres

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) Preparation of chitosan nano-microspheres: Dissolve weighed chitosan in 1% dilute acetic acid solution, prepare 2 g / L chitosan solution and filter out impurities. Slowly add 1g / L sodium tripolyphosphate solution dropwise (2-4ml / min) to the chitosan solution, stir until the solution becomes a milky suspension, and the final addition ratio is 4:1 (v:v=chitosan Solution: sodium tripolyphosphate solution) or so. Concentrate the prepared chitosan nano-microsphere suspension under reduced pressure, and then dry it in a vacuum oven at 50° C. for 22 hours until it becomes solid.

[0034] (2) Preparation of removal solution: prepare sodium dihydrogen phosphate ~ citric acid buffer solution, pH = 5.4, mix the buffer solution with glycerol at a volume ratio of 2:1 to obtain a glycerol buffer solution, and then add chitosan nano-microspheres Add 1.5% to glycerol buffer to prepare chitosan nanosphere dispersion.

[0035] (3) Removal of cadmium ions in C. kangshii male: adjust ...

Embodiment 2

[0040] (1) Preparation of chitosan nano-microspheres: Dissolve weighed chitosan in 1% dilute acetic acid solution, prepare 1.5 g / L chitosan solution and filter out impurities. Slowly add 0.8g / L sodium tripolyphosphate solution dropwise (2-4ml / min) to the chitosan solution, stir until the solution becomes a milky suspension, and the final addition ratio is 4:1 (v:v=chitosan Sugar solution: sodium tripolyphosphate solution) or so. Concentrate the prepared chitosan nano-microsphere suspension under reduced pressure, and then dry it in a vacuum oven at 50° C. for 22 hours until it becomes solid.

[0041] (2) Preparation of removal solution: prepare sodium dihydrogen phosphate-citric acid buffer solution, pH=4.5, mix the buffer solution and glycerol at a volume ratio of 3:1 to obtain a glycerol buffer solution, and then add chitosan nano-microspheres Add 2% to glycerol buffer to prepare chitosan nanosphere dispersion.

[0042] (3) Removal of cadmium ions in the male fish C. kangs...

Embodiment 3

[0044] (1) Preparation of chitosan nano-microspheres: Dissolve weighed chitosan in 1% dilute acetic acid solution to prepare 2.5 g / L chitosan solution and filter out impurities. Slowly add 1.5g / L sodium tripolyphosphate solution dropwise (2-4ml / min) to the chitosan solution, stir until the solution becomes a milky suspension, and the final addition ratio is 5:1 (v:v=chitosan Sugar solution: sodium tripolyphosphate solution) or so. Concentrate the prepared chitosan nano-microsphere suspension under reduced pressure, and then dry it in a vacuum oven at 50° C. for 22 hours until it becomes solid.

[0045] (2) Preparation of removal solution: prepare sodium dihydrogen phosphate-citric acid buffer solution, pH=6.0, mix the buffer solution and glycerol in a volume ratio of 3:2 to obtain a glycerol buffer solution, and then add chitosan nanospheres Add 1% to glycerol buffer to prepare chitosan nanosphere dispersion.

[0046] (3) Removal of cadmium ions in the male fish C. kangshii:...

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Abstract

The invention discloses a method for removing cadmium from tiny dried fishes by adopting chitosan nanoparticles. The method comprises the following steps: preparing a chitosan solution; preparing a chitosan nanoparticle suspension; preparing chitosan nanoparticles; preparing a chitosan nanoparticle dispersion liquid; and removing the cadmium from the tiny dried fishes. According to the invention,chitosan is taken as a main raw material, and a chitosan nanoparticle cadmium ion-removing liquid is prepared by charge adsorption action of phosphate and the chitosan, and the tiny dried fishes can be treated with the removing liquid so as to achieve the purpose of reducing the cadmium ion content of the tiny dried fishes. The method uses the chitosan nanoparticles to remove cadmium ions in aquatic products for the first time, simultaneously realizes the removal of cadmium ions in the whole aquatic products in a processing stage rather than a living body culture stage, breaks through the limitation that traditional cadmium ion removal of aquatic products relies on the metabolic circulation of removal agents by living bodies or is limited to a liquid homogeneous system, improves the requirement that pH value of a system is above 7 when cadmium ions are removed by adopting single chitosan or a chitosan mixture, and has wide market prospect and application value.

Description

technical field [0001] The invention belongs to the technical field of food processing, and in particular relates to a method for removing cadmium in dried small fish by using chitosan nano microspheres. Background technique [0002] Cadmium is a metal ion with strong toxicity and wide distribution. At the same time, it is difficult to be degraded, and it is easy to accumulate in animals and plants. A large number of epidemiological studies have shown that cadmium has strong toxicity to the kidney and urinary system, and can also increase the risk of lung cancer, breast cancer, pancreatic cancer and other cancers. According to related reports, among the common types of offshore fish, the heavy metals with high content include zinc, copper, lead, cadmium, mercury, etc., and cadmium is usually distributed in the liver and other organs in fish. The ready-to-eat small dried fish on the market is mostly made of small male fish of the Kang family, also known as male dried fish, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A23L5/20
CPCA23L5/273
Inventor 夏文水曹世宁杨方姜启兴许艳顺于沛沛许学勤王斌
Owner JIANGNAN UNIV
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