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A method and detection tube for visual detection of benzoyl peroxide in flour

A technology of benzoyl peroxide and flour is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, which can solve the problems of complex overall operation and lack of color discrimination. Achieving the effect of high resolution and rich system color changes

Active Publication Date: 2019-09-13
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The overall operation is still relatively complicated; there is also a rapid detection kit (201110436046.4) that uses the preparation of a fluorescent probe and then reacts with benzoyl peroxide to generate a fluorescent substance, and finally requires an instrument to achieve detection; the test paper method (201110162397.0) uses The iodine starch reaction generated by iodine oxidation is portable and easy to operate, but it is still lacking in color differentiation only by relying on the color depth of iodine starch

Method used

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  • A method and detection tube for visual detection of benzoyl peroxide in flour
  • A method and detection tube for visual detection of benzoyl peroxide in flour
  • A method and detection tube for visual detection of benzoyl peroxide in flour

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Synthesis of Au nanorod solution:

[0024] Synthesis of seed crystals: In 9.75 mL cetyltrimethylammonium bromide solution (CTAB), add 0.25 mL chloroauric acid solution (9.711 mmol / L), then add 0.6 mL sodium borohydride solution (0.01 mol / L L), after stirring for 30s, settling at 30°C for 1 hour, set aside, the color is tea brown;

[0025] Growth of Au nanorods: In 100 mL cetyltrimethylammonium bromide solution (CTAB), add 5.15 mL chloroauric acid solution (9.711 mmol / L), 0.1 mL silver nitrate solution (0.1 mol / L) , 2 mL of hydrochloric acid solution (1 mol / L), then add 0.8 mL of ascorbic acid solution (0.1 mol / L), mix well, add 0.5 mL of the seed crystal synthesized in step (1), keep it overnight in the dark, and then centrifuge to remove the supernatant, redispersed in 50 mL cetyltrimethylammonium bromide solution (CTAB).

[0026] 2. Synthesis of Au@Ag core-shell nanorods:

[0027] (A) Take 4 mL of the synthesized Au nanorod solution, centrifuge at 12,000 rpm...

Embodiment 2

[0034] 1. Spectrophotometric detection of benzoyl peroxide in plain flour based on Au@Ag core-shell nanorod solution:

[0035] Take the Au@Ag core-shell structure nanorod solution, dilute it with water, add CTAB solution, and then add 100 µL of plain flour extract containing different concentrations of benzoyl peroxide (0 mg / kg, 20 mg / kg, 40 mg / kg, 60 mg / kg, 80 mg / kg, 100 mg / kg), mix well. The corresponding relationship between the concentration of benzoyl peroxide and the change of the solution color is shown in Table 2; the absorption peak of the solution at 560 nm gradually red shifted to 610 nm.

[0036] Table II

[0037]

[0038] 2. Preparation of gel detection tubes:

[0039] Gel detection tube preparation: 300 µL of Au@Ag core-shell structure nanorod solution was added to the agarose gel solution, and the temperature of the gel water bath was controlled at 40 °C. After mixing, take 100 µL of the mixture into the cap of the detection tube. After standing for 5 min,...

Embodiment 3

[0041] 1. Preparation of standard color card for detecting benzoyl peroxide by gel detection tube:

[0042] Take different concentrations of 1 mL of benzoyl peroxide ethanol solution (0 μmol / L, 20 μmol / L, 40 μmol / L, 60 μmol / L, 80 μmol / L, 100 μmol / L, 200 μmol / L) into the gel detection tube, cover the lid, place it upside down, and then place it at room temperature. After reacting for 25 minutes, place the gel detection tube upright, and open the lid to take pictures, and obtain the relationship between the concentration of benzoyl peroxide and the color of the gel. change correspondence. Make a standard color card for the detection of benzoyl peroxide in gel test tubes.

[0043] 2. Gel detection tube to detect benzoyl peroxide in high-gluten flour:

[0044] Determination of benzoyl peroxide in high-gluten flour by standard addition method. Weigh 1g of high-gluten flour, add different qualities of benzoyl peroxide, so that the mass concentration of benzoyl peroxide in the flo...

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Abstract

The invention discloses a method of visually detecting benzoyl peroxide in flour and a detection tube. The method comprises the following steps: firstly, synthesizing a nanorod of an Au@Ag core-shell structure; by taking a sepharose gel as a carrier, in the presence of benzoyl peroxide, performing a developing reaction to generate different color changes; and then indicating change of concentrations of benzoyl peroxide by mean of color changes to visually detect benzoyl peroxide in flour. By taking the nanorod of the Au@Ag core-shell structure as a developing body, the system is richer in color change and the resolution of color change is higher. The method does not need expensive apparatuses and equipment and can judge concentration of benzoyl peroxide according to color change of a gel tube without professional operations, so that benzoyl peroxide in flour can be visually detected in site.

Description

technical field [0001] The invention belongs to the technical field of detection of benzoyl peroxide in flour, and in particular relates to a method for visually detecting benzoyl peroxide in flour and a detection tube. Background technique [0002] Flour is one of the main raw materials in people's daily dietary structure. In order to improve its apparent quality, flour manufacturers have widely used benzoyl peroxide as a flour whitening improver in the past. Although benzoyl peroxide is an oxidant widely used in the chemical industry, not only the nutrients such as carotene and vitamin E in the flour are destroyed during the whitening process, but also the residual benzoyl peroxide is heated when the pasta is heated. Benzene free radicals, benzene, phenol, biphenyl, etc. will be generated, which have potential safety hazards. Long-term consumption can cause chronic poisoning of benzene and cause various diseases. Since May 1, 2011, the Ministry of Health of my country h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78
Inventor 郭良洽林天然张敏卿许福海
Owner FUZHOU UNIV
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