Method for chemistry testing potassium bromate in flour, amendment or food

A detection method, the technology of potassium bromate, which is applied in the direction of analyzing materials through chemical reactions, observing the influence of chemical indicators on material analysis, measuring devices, etc., can solve the hidden dangers of inoperability, misjudgment, and potassium bromate market regulation, etc. problems, to achieve the effect of small experimental investment, easy operation and high accuracy

Inactive Publication Date: 2008-07-23
河南兴泰科技实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the qualitative and quantitative methods for pure potassium bromate are very perfect in the world, but in complex mixing systems such as flour improver and flour, the test method for potassium bromate is not perfect
For example: the qualitative and quantitative detection methods of bromate in flour introduced by AACC-48-42 and AOAC 956.03 in the United States are basically the same. It is a general qualitative detection method for oxidants, not a specific detection method for potassium bromate, and the final detection results will be due to the presence of CaO in flour 2 Misjudgment caused by other oxidant substances that can be legally used
Now another method for measuring potassium bromate in flour, improver, and food is ion chromatography. Ion chromatography requires the use of special instruments, but the investment in equipment is large, which makes the promotion and application of this method have certain limitations. At present, domestic Most of the testing institutions in China do not have this equipment, and do not have the ability to use ion chromatography to detect potassium bromate, and it is even more inoperable for domestic flour and food companies. Flour companies cannot detect whether potassium bromate is contained in the improver at any time. Food companies It is impossible to detect whether potassium bromate is contained in flour raw materials at any time, which will cause great hidden dangers to the market regulation that potassium bromate is banned
At present, there is no other simple, rapid, sensitive and stable method for detecting potassium bromate in flour, improver and food

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Sample processing

[0023] Take 100g of bromate-containing flour sample, add 0.1g of NaOH powder, mix well, put it into an evaporating dish, and carbonize it on an electric furnace. After the ashing is complete, cool down, dissolve the ashed sample with 4ml of water, and add 2mol / l H 2 SO 4 2mL, adjust the pH to 3, heat slightly to 60°C on the electric stove, transfer the solution to a 10ml centrifuge tube, and then add a small amount of water and 2mol / l H 2 SO 4 Rinse the evaporating dish, transfer all the washing liquid into a 10ml centrifuge tube, and control the pH value at about 1. Centrifuge at 2800r / min for 10min, and take the supernatant for later use.

[0024] 2. Determination of Potassium Bromate

[0025] Transfer the above supernatant into a 60ml separatory funnel, add 0.1ml freshly prepared saturated chlorine water dropwise, add 5ml carbon tetrachloride after shaking, shake, place layers, and filter the organic solvent layer into a cuvette with absor...

Embodiment 2

[0027] 1. Sample processing

[0028] Take 2 grams of bromate-containing modifier, add 0.1g KOH powder, mix well, put it in an evaporating dish, and carbonize it on an electric furnace. After the carbonization is complete, transfer the evaporating dish to a muffle furnace, and incinerate at 520°C. After the ashing is complete, cool down, dissolve the ashed sample with 3ml of water, and add 2mol / l H 2 SO 4 1-2ml, adjust the pH to 4, heat slightly on the electric stove to 50°C, transfer the solution to a 10ml centrifuge tube, and then use a small amount of water and 2mol / l H 2 SO 4 Rinse the evaporating dish, transfer all the washing liquid into a 10ml centrifuge tube, and control the pH value at about 1. Centrifuge at 2800r / min for 10min, and take the supernatant for later use.

[0029] 2. Determination of Potassium Bromate

[0030] Transfer the above supernatant into a 60mL separatory funnel, add 0.1ml of 2mol / l potassium permanganate solution, oscillate, add 5ml of chloro...

Embodiment 3

[0032] 1. Sample processing

[0033] Take 150 grams of steamed bread with potassium bromate, add 0.1g of NaOH powder, mix well, put it in an evaporating dish, and carbonize it on an electric furnace. After the melting is complete, cool down, dissolve the ashed sample with 5ml of water, add 1-2ml of 2mol / l hydrochloric acid, adjust the pH to 4, slightly heat to 50°C on an electric furnace, transfer the solution to a 10ml centrifuge tube, Then wash the evaporating dish with a small amount of water and 2mol / l hydrochloric acid respectively, transfer all the washing liquid into a 10ml centrifuge tube, and control the pH value at 1.5. Centrifuge at 2800r / min for 10min, and take the supernatant for later use.

[0034] 2. Determination of Potassium Bromate

[0035] Transfer the above supernatant into a 60ml separatory funnel, add 0.1ml of hydrogen peroxide, add 5ml of benzene after shaking, shake, place and layer, the organic solvent layer is filtered with absorbent cotton into a c...

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Abstract

The invention discloses a chemical test method of potassium bromate in flour, modifying agent or food, which comprises (1), processing sample composed of adding alkali into sample, heating and ashing, dissolving in water, adding acid to adjust pH at 2-5, moving all solution into a centrifugal pipe, controlling the pH value at 1-2, centrifugally treating and taking supernatant fluid, (2), testing potassium bromate composed of adding the supernatant with oxidant, vibrating and adding organic solvent, vibrating, laying and laminating, using distilled water as blank, using spectrophotometer to check the light absorption value of the organic solvent layer and indicating that the sample contains potassium bromate when the light absorption value is not lower than 0.010. The oxidant is strong one and the organic solvent is non-polar or weak-polar organic one. The invention provides a novel, simple, quick, sensitive and stable method for chemically checking potassium bromate in flour, modifying agent or food.

Description

technical field [0001] The invention relates to a detection method of potassium bromate, in particular to a chemical detection method of potassium bromate in flour, improver or food. Background technique [0002] Potassium bromate is a slow oxidizing agent. Potassium bromate was once considered one of the best dough conditioners in the baking industry. It was used in bread baking. At present, potassium bromate has been banned due to its safety problems. . However, because there is no safe and effective substitute, and some small manufacturers secretly use potassium bromate, therefore, how to detect potassium bromate in flour, improvers, and food is of great significance. At present, the qualitative and quantitative methods for pure potassium bromate are very perfect in the world, but in complex mixing systems such as flour improver and flour, the test method for potassium bromate is not perfect. For example: the qualitative and quantitative detection methods of bromate in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17G01N21/78
Inventor 白伟王会君
Owner 河南兴泰科技实业有限公司
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