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Method and kit for rapidly and selectively detecting added aluminum in food

A selective, kit-based technology, applied in the direction of material analysis by observing the effect of chemical indicators, and analysis by chemical reaction of materials, etc., can solve the problem of inaccurate results, inability to achieve selective detection, time-consuming, etc. question

Inactive Publication Date: 2019-04-16
HUBEI PROVINCIAL INST FOR FOOD SUPERVISION & TEST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are two main methods for extracting food aluminum, one is wet digestion, and the other is microwave digestion. These two methods have technical shortcomings such as time-consuming and complicated operation, and are not suitable for rapid detection at home and on-site law enforcement.
There are finished aluminum quick test kits for sale on the market, but most of the commercially available aluminum quick test kits extract trivalent aluminum in food by soaking in water. This method has a low extraction rate and inaccurate results. Some also use acidification. To extract trivalent aluminum in food, the pure acid used in this method has certain safety hazards in the process of storage, transportation and use, and can only detect the total aluminum content in food, and cannot distinguish the background aluminum and added aluminum in food , cannot achieve selective detection

Method used

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  • Method and kit for rapidly and selectively detecting added aluminum in food
  • Method and kit for rapidly and selectively detecting added aluminum in food
  • Method and kit for rapidly and selectively detecting added aluminum in food

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A detection kit for rapid and selective detection of aluminum added in food

[0026] The kit contains three detection solutions, which are detection solutions A, B, and C. The components are as follows:

[0027] Detection solution A: DTPA solution with a concentration of 3000μg / mL, the actual concentration in the extraction system is 300μg / mL

[0028] Detection solution B: bismuth nitrate solution with a concentration of 3000 μg / mL, the actual concentration in the color development system is 300 μg / mL

[0029] Detection solution C: is composed of chromazurin S solution (1g / L), TritonX-100 solution (3%wt), CATB solution (3g / L), ethylenediamine-hydrochloric acid buffer solution (pH6.7~7.0) according to The volume ratio of 3:1:3:3 is mixed and prepared, and it is a mixed reagent of chromazurin S. Among them, chrome azure S solution and CATB solution are prepared by 50% ethanol solution as solvent, TritonX-100 solution is prepared by pure water, ethylenediamine-hydrochlor...

Embodiment 2

[0031] A detection kit for rapid and selective detection of aluminum added in food

[0032] The kit contains three detection solutions, which are detection solutions A, B, and C. The components are as follows:

[0033] Preparation of detection solution A: Weigh 0.15g DTPA solid and 0.15g NaOH solid into a 50mL centrifuge tube, add about 30mL water to dissolve, finally add water to the 50mL mark and shake well, adjust the pH with 1+1 hydrochloric acid solution to make it acidic, This is test solution A. When preparing test solution A, a small amount of alkali is added because DTPA is insoluble in water. By adding alkali, it undergoes an acid-base neutralization reaction to produce a water-soluble sodium salt.

[0034] Preparation of test solution B: Weigh 0.15g of bismuth nitrate solid into a 50mL centrifuge tube, add about 30mL of water to dissolve, and finally add water to the 50mL mark and shake well. This is test solution B.

[0035] Detection solution C: is composed of c...

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Abstract

The invention discloses a method and a kit for rapidly and selectively detecting added aluminum in a food. According to the method, the added aluminum in a sample is extracted through diethylenetriamine pentaacetic acid (DTPA) complexing, so that selective extraction of the added aluminum in the food is realized; then bismuth ions in a bismuth nitrate solution are used for carrying out competitivecomplexing of DTPA to release aluminum ions; the free aluminum ions, in an ethylenediamine-hydrochloric acid buffer solution, react with chrome azurol S to generate blue-green quaternary micelles inthe presence of TritonX-100 and cetyl trimethyl ammonium bromide; and qualitative comparison with a colorimetric card is carried out. Meanwhile, the concentration of the trivalent aluminum ions in thesample can be estimated according to the known concentration on the colorimetric card, thereby realizing semi-quantification. The kit can meet field rapid detection requirements of food aluminum additives, and is suitable for family detection and field law enforcement detection, particularly flour food detection.

Description

technical field [0001] The invention relates to the technical field of food detection, in particular to a method and kit for rapid and selective detection of aluminum added in food. Background technique [0002] Aluminum is one of the most abundant metal elements in the earth's crust, but aluminum is not an essential trace element for the human body. With the development of science and technology, a number of research results have shown that excessive intake of aluminum by the human body will disturb the activity of the central nervous system after accumulation in the body, cause digestive system dysfunction, hinder normal calcium and phosphorus metabolism, and inhibit the body's immune system. Oxidative system, causing many diseases. At present, the national standard GB 2760-2014 "National Food Safety Standard Food Additive Use Standard" issued by the National Health and Family Planning Commission clearly stipulates the scope and maximum usage of aluminum-containing additi...

Claims

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Application Information

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IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 胡家勇周陶鸿宋政朱影彭青枝李珉范志勇万旭刚张莉
Owner HUBEI PROVINCIAL INST FOR FOOD SUPERVISION & TEST
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