Rapid cereal digestion method and applications thereof

A technology of grain and ferric tetroxide, which is used in the preparation, sampling, and measuring devices of test samples, can solve the problems of difficult separation and recovery of iron-containing reagents, consumption of large and strong corrosive acids, and high cost of instruments, so as to shorten the sample time. The effect of pretreatment time, reduction of temperature and consumption of concentrated acid, and simplification of digestion steps

Inactive Publication Date: 2018-07-06
COFCO GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these existing digestion methods have the following disadvantages: it takes at least two hours in time; the steps are cumbersome; the temperature must reach at least 150°C; at the same time, a large amount of strong corrosive acid needs to be consumed; for microwave digestion, the required instrument cost is relatively high high
However, so far, there is no report on the application of the Fenton reaction or its analogues in grain digestion
On the other hand, when the conventional Fenton reaction is used in the pretreatment method, there are problems such as difficult separation and recovery of iron-containing reagents.

Method used

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  • Rapid cereal digestion method and applications thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The mensuration of cadmium content in the rice sample of embodiment 1

[0038] The rice sample was crushed and passed through a 50-mesh sieve, and 0.2 g of the sample (accurate to four decimal places) was weighed as a digestion sample, and placed in a 50 mL centrifuge tube.

[0039] Add 5 mL of 30% hydrogen peroxide, 0.003 g of ferroferric oxide magnetic nanoparticles, and 50 μL of nitric acid. The strength is 3W / mL. After the digestion, a magnet was used to remove the ferroferric oxide magnetic nanoparticles from the solution, and the solution was constant volume to 10 mL to obtain a sample solution to be tested.

[0040] A Cd standard solution with a concentration of 4 μg / L was prepared, and the constant volume solvent was 1% nitric acid.

[0041] Use an atomic absorption spectrophotometer to measure the standard series solutions with concentrations of 0.6μg / L, 1μg / L, 2μg / L, 3μg / L, and 4μg / L, draw a standard curve, and then perform the measurement, and then obtain t...

Embodiment 2

[0043] The mensuration of cadmium content in the wheat core powder sample of embodiment 2

[0044] Weigh 0.2 g of a commercially available wheat core powder sample (accurate to four decimal places) as a digestion sample, and place it in a 50 mL centrifuge tube.

[0045] Add 5 mL of 30% hydrogen peroxide, 0.003 g of ferroferric oxide magnetic nanoparticles, and 50 μL of nitric acid. The strength is 3W / mL. After the digestion, a magnet was used to remove the ferroferric oxide magnetic nanoparticles from the solution, and the solution was constant volume to 10 mL to obtain a sample solution to be tested.

[0046] A Cd standard solution with a concentration of 4 μg / L was prepared, and the constant volume solvent was 1% nitric acid.

[0047] Use an atomic absorption spectrophotometer to measure the standard series solutions with concentrations of 0.6μg / L, 1μg / L, 2μg / L, 3μg / L, and 4μg / L, draw a standard curve, and then perform the measurement, and then obtain the sample to be test...

Embodiment 3

[0049] The mensuration of cadmium content in the rice sample of embodiment 3

[0050] The rice sample was crushed and passed through a 50-mesh sieve, and 0.2 g of the sample (accurate to four decimal places) was weighed as a digestion sample, and placed in a 50 mL centrifuge tube.

[0051] Add 6 mL of 30% hydrogen peroxide, 0.005 g of ferroferric oxide magnetic nanoparticles, and 60 μL of nitric acid. The intensity is 4W / mL. After digestion, use a magnet to separate the ferroferric oxide magnetic nanoparticles from the solution, and dilute the solution to 10 mL to obtain the sample solution to be tested.

[0052] A Cd standard solution with a concentration of 4 μg / L was prepared, and the constant volume solvent was 1% nitric acid.

[0053] Use an atomic absorption spectrophotometer to measure the standard series solutions with concentrations of 0.6μg / L, 1μg / L, 2μg / L, 3μg / L, and 4μg / L, draw a standard curve, and then perform the measurement, and then obtain the sample to be t...

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Abstract

The invention relates to a rapid cereal digestion method based on a Fenton-like reaction. According to the method, cereals contact hydrogen peroxide, magnetic Fe3O4 nanoparticles and a small amount ofnitric acid so as to carry out rapid digestion. Compared to the traditional method, the method of the present invention has advantages of digestion step simplifying, sample pretreatment time shortening, reducing of the temperature required by the reaction, concentrated acid consumption reducing, detection cost saving and accurate quantification. The invention further relates to a method for determining the cadmium content in cereal, wherein the method comprises: carrying out pretreatment on a cereal sample through the rapid cereal digestion method.

Description

technical field [0001] The invention relates to the technical field of food detection, in particular, the invention relates to a method for rapid digestion of grains and the application of the method in the determination of cadmium content in grains. Background technique [0002] my country has a vast territory and abundant grain production. Ensuring the safety and harmlessness of grain is an important part of ensuring people's livelihood. Rice is an important food crop in our country, and its safety issues have been widely concerned by the society. [0003] Research on heavy metal contamination in grains is crucial to food safety. In particular, the rice cadmium pollution problem that has emerged in recent years threatens the food safety of our people. Cadmium is a heavy metal pollutant in food. Excessive intake will cause great harm to human health. The detection of cadmium content in rice production and circulation is an effective means to prevent cadmium-contaminated r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/28G01N1/34
CPCG01N1/286G01N1/34G01N21/3103
Inventor 周正陆金鑫黄蔚霞
Owner COFCO GROUP
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