Method for detecting content of benzoyl peroxide in flour

A technology for the detection of benzoyl peroxide, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions. It can solve the problems of long detection time, expensive instruments, and cumbersome operations. and other problems, to achieve the effect of reducing testing costs and testing time, realizing on-site testing, and simple operation

Inactive Publication Date: 2012-02-15
邢台市产品质量监督检验所 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods are difficult to carry out on-site due to cumbersome operations, long detection time, expensive instruments, and high requirements for operators.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Take 5g of flour and put it in a beaker, add 10ml of 95% ethanol, stir and soak thoroughly to obtain the extract of benzoyl peroxide.

[0025] (2) Put the extract of benzoyl peroxide into a centrifuge tube and centrifuge for 5 minutes at a speed of 4000 rpm to obtain a supernatant.

[0026] (3) Put 2ml of the supernatant into a colorimetric tube, add 0.1ml of 100g / L potassium iodide solution, adjust the pH to 2 with hydrochloric acid, and place it in the dark for 20 minutes.

[0027] (4) Add 0.2ml of 10g / L starch indicator to the colorimetric tube in step (3).

[0028] The preparation method of the starch indicator is as follows: take 1g of soluble starch and adjust it to a thin paste with cold water, pour it into boiling water while stirring, fully stir the boiling water added with starch until it becomes transparent, leave it to cool, and obtain the starch indicator. The cold water and The total amount of boiling water is 100ml.

[0029] (5) Dilute the liquid in...

Embodiment 2

[0034] (1) Take 5g of flour and put it in a beaker, add 10ml of absolute ethanol, stir and soak thoroughly to obtain the extract of benzoyl peroxide.

[0035] (2) Put the extract of benzoyl peroxide into a centrifuge tube and centrifuge for 20 minutes at a speed of 1000 rpm to obtain a supernatant.

[0036] (3) Take 2ml of the supernatant and put it into a colorimetric tube, add 0.2ml of 100g / L potassium iodide solution, adjust the pH to 2 with sulfuric acid, and place it in the dark for 10 minutes.

[0037] (4) Add 0.4ml of 10g / L starch indicator to the colorimetric tube in step (3).

[0038] (5) Dilute the liquid in the colorimetric tube in step (4) to 20ml with water.

[0039] (6) Comparing the color of the liquid in the diluted colorimetric tube with the standard colorimetric card, the content of benzoyl peroxide is 0.08g / kg.

[0040] Other steps are with embodiment 1.

Embodiment 3

[0042] (1) Take 5g of flour and put it in a beaker, add 10ml of absolute ethanol, stir and soak thoroughly to obtain the extract of benzoyl peroxide.

[0043] (2) Put the extract of benzoyl peroxide into a centrifuge tube and centrifuge for 10 minutes at a speed of 3000 rpm to obtain a supernatant.

[0044] (3) Take 2ml of the supernatant and put it into a colorimetric tube, add 0.15ml of 100g / L potassium iodide solution, adjust the pH to 2 with phosphoric acid, and place it in the dark for 15 minutes.

[0045] (4) Add 0.3ml of 10g / L starch indicator to the colorimetric tube in step (3).

[0046] (5) Dilute the liquid in the colorimetric tube in step (4) to 15ml with water.

[0047] (6) Comparing the color of the liquid in the diluted colorimetric tube with the standard colorimetric card, the content of benzoyl peroxide is 0.06g / kg.

[0048] Other steps are with embodiment 1.

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PUM

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Abstract

The invention discloses a method for detecting the content of benzoyl peroxide in flour. The method comprises the following steps of adding an organic solvent into flour, fully stirring, carrying out immersion to obtain benzoyl peroxide extract, carrying out centrifugation of the benzoyl peroxide extract to obtain supernatant liquid, putting the supernatant liquid into a colorimetric pipe, addinga potassium iodide solution into the colorimetric pipe, adjusting a pH value of the mixed solution in the colorimetric pipe to a pH value of 2 by strong acid, placing the colorimetric pipe in the shadow until a reaction is balanced; adding a starch indicator into the colorimetric pipe, adding water into the colorimetric pipe for dilution of the mixed solution in the colorimetric pipe, and comparing a color of the diluted solution in the colorimetric pipe with colors of a standard colourimetric card to determine the content of benzoyl peroxide. The method is easy for operation, does not need ahigh-priced apparatus, reduces a detection cost and detection time, has low requirements for detection persons and a detection environment, can realize on-site detection, and is suitable for on-site analysis and large-area screening work.

Description

technical field [0001] A method for detecting benzoyl peroxide content in flour. Background technique [0002] Benzoyl peroxide is a white powder, insoluble in water, easily soluble in ethanol, acetone, benzene, chloroform, ether and other organic solvents, and is a highly reactive oxidizing substance. Its strong oxidizing properties have whitening and antiseptic effects on flour, so it is used as a flour whitening agent and improver. Benzoyl peroxide will destroy the nutritional content of flour, resulting in the loss of natural ingredients such as lutein and carotenoids in flour, and excessive consumption of benzoyl peroxide will cause nausea, dizziness, neurasthenia, etc. in the short term Poisoning phenomenon, long-term excessive consumption can cause serious damage to the liver. [0003] my country's Ministry of Health and other ministries and commissions officially issued an announcement on March 1, 2011, requiring that the addition of whitening agents in flour produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/77
Inventor 刘荣琴髙磊红王未肖申丽娟侯文瑞康牧旭刘乐平宋明明
Owner 邢台市产品质量监督检验所
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