Methods for preparing carboxymethyl chitosan magnetic microspheres and adsorbing cadmium in oyster meat by using carboxymethyl chitosan magnetic microspheres

A technology of carboxymethyl chitosan and magnetic microspheres, which is applied in microsphere preparation, food preparation, microcapsule preparation and other directions, can solve problems such as waste, and achieve the effects of simple production method, convenient use and avoidance of secondary pollution

Inactive Publication Date: 2010-02-03
GUANGDONG OCEAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the aquatic raw materials can be strictly monitored, and unqualified aquatic raw materials can be kept out of the factory, but it will cause a lot of waste

Method used

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  • Methods for preparing carboxymethyl chitosan magnetic microspheres and adsorbing cadmium in oyster meat by using carboxymethyl chitosan magnetic microspheres

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Weigh ferrous chloride and ferric chloride and mix them according to 2:1, add ammonia water dropwise under the protection of nitrogen to make the pH 10, stir to form black precipitate, wash and dry in vacuum to prepare Fe 3 o 4 nanoparticles. Then make carboxymethyl chitosan into 2% aqueous solution, and Fe 3 o 4 Nanoparticles were mixed according to the mass ratio of raw materials at 2:1, added to liquid paraffin, and Tween 80 was added, sodium sulfate was added to form a precipitate, glutaraldehyde was added, the temperature was raised to 40°C and stirred for 1 hour, then the temperature was raised to 60°C, and stirred for 5 hours , washed after separation, and vacuum-dried.

[0023] Shell the oysters and take the meat, add water that meets the drinking standard according to the ratio of material to liquid 1:2, beat, filter off the residue, add hydrochloric acid to make the pH 3, add the prepared magnetic microspheres according to 2% of the amount of oysters, and s...

Embodiment 2

[0026] Weigh ammonium ferrous sulfate and ammonium ferric sulfate according to 1:1, add ammonia water dropwise under the protection of nitrogen to make the pH 10, stir to form black precipitate, wash and dry in vacuum to prepare Fe 3 o 4 nanoparticles. Then make carboxymethyl chitosan into 1.5% aqueous solution, and Fe 3 o 4 Nanoparticles are mixed according to the mass ratio of raw materials at 5:1, added to liquid paraffin, and Span 80 is added, sodium sulfate is added to form a precipitate, glutaraldehyde is added, the temperature is raised to 40°C and stirred for 2 hours, then heated to 60°C, stirred for 5 hours , washed after separation, and vacuum-dried.

[0027] Shell the oysters and take the meat, add water that meets the drinking standard according to the ratio of solid to liquid 1:5, beat, filter off the residue, add hydrochloric acid to make the pH 2.5, add the prepared magnetic microspheres according to 10% of the amount of oysters, and slowly Stir for 90 minut...

Embodiment 3

[0029] Weigh ferrous chloride and ferric chloride and mix them according to 1:2, add ammonia water dropwise under the protection of nitrogen to make the pH 10, stir to form black precipitate, wash and dry in vacuum to prepare Fe 3 o 4 nanoparticles. Then make carboxymethyl chitosan into 2.5% aqueous solution, and Fe 3 o 4 Nanoparticles are mixed according to the mass ratio of raw materials at 3:1, added to n-hexanol, and Tween 80 is added, sodium sulfate is added to form a precipitate, formaldehyde is added, the temperature is raised to 40°C and stirred for 2 hours, then heated to 60°C, stirred for 2 hours, separated After cleaning, vacuum dry.

[0030] Shell the oysters and take the meat, add water that meets the drinking standard according to the ratio of material to liquid 1:1, beat the pulp, filter off the residue, add hydrochloric acid to make the pH 3.5, add the prepared magnetic microspheres according to 5% of the oysters, and slowly Stir for 30 minutes, and use mag...

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Abstract

The invention discloses methods for preparing carboxymethyl chitosan magnetic microspheres and adsorbing cadmium in oyster meat by using the carboxymethyl chitosan magnetic microspheres. Carboxymethylchitosan and Fe3O4 nanoparticles are adopted to be dispersed in organic solvent added with emulsifying agent, coprecipitation is formed after adding sodium sulfate, treatment is conducted by using crosslinking agent, and then the carboxymethyl chitosan magnetic microspheres are prepared after washing and drying. Oyster shells are opened for taking out meat, after adding water and beating, the pHis adjusted, then the meat is mixed with the magnetic microspheres so as to adsorb cadmium in the oyster meat, and the used magnetic microspheres can be regenerated after the removal of the cadmium byadded EDTA. The application of the invention can solve the difficult problem of cadmium pollution in the oysters, and promote the effective utilization of shellfish resources.

Description

technical field [0001] The invention provides a method for preparing carboxymethyl chitosan magnetic microspheres and adsorbing cadmium in oyster meat. Background technique [0002] my country is a big country in oyster farming, and the oyster output accounts for about 40% of the cultured shellfish, and the resources are extremely rich. However, due to the intensification of global environmental pollution and the increasing amount of industrial wastewater and domestic sewage entering the sea, heavy metals such as Cd and Pb in some oysters seriously exceed the standard, which cannot meet the requirements of safe consumption. How to control the heavy metal content in aquatic products to meet the national health standards is an important research topic for domestic and foreign aquatic product processing industries and scientific research institutes. On the one hand, aquatic raw materials can be strictly monitored, and unqualified aquatic raw materials can be kept out of the fa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02A23L1/015
Inventor 杨锡洪解万翠章超桦秦小明燕莉莉
Owner GUANGDONG OCEAN UNIVERSITY
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