Vanadium trichloride mixed powder and application thereof in quickly measuring nitrate content in food

A kind of vanadium trichloride, the technology of vanadium trichloride, applied in the direction of color/spectral property measurement, etc., to achieve the effects of rapid time-consuming, increased stability, and low cost

Active Publication Date: 2016-09-21
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the test strip method and the kit can only be used for quantitative and semi-qualitative detection by direct comparison with test strips, color cards and other carriers, and further tests are needed to determine the exact nitrate content.

Method used

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  • Vanadium trichloride mixed powder and application thereof in quickly measuring nitrate content in food
  • Vanadium trichloride mixed powder and application thereof in quickly measuring nitrate content in food
  • Vanadium trichloride mixed powder and application thereof in quickly measuring nitrate content in food

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 Vanadium chloride mixed powder

[0035] A vanadium trichloride mixed powder, comprising the following components: the mass ratio of sodium chloride, sulfamic acid, p-aminobenzenesulfonic acid, naphthylethylenediamine hydrochloride and vanadium trichloride is 200-600:10-60: 20 to 30: 0.5 to 1.5: 0.3 to 1.5.

[0036] Preferably, the mass ratio of sodium chloride, sulfamic acid, p-aminobenzenesulfonic acid, naphthylethylenediamine hydrochloride and vanadium trichloride is 300-500:10-30:20-30:0.5-1.5:0.3-0.9 .

[0037] More preferably, the mass ratio of sodium chloride, sulfamic acid, p-aminobenzenesulfonic acid, naphthylethylenediamine hydrochloride and vanadium trichloride is 400:20:25:0.9:0.6.

Embodiment 2

[0038] Example 2 Method for rapid determination of nitrate content in fresh vegetables

[0039] 1. A method for rapid determination of nitrate content in fresh vegetables, comprising the following steps:

[0040] (1) Take 5~10g of vegetable homogenate, dilute to 250mL with 2% acetic acid solution, shake for 5min, filter and put 3mL of sample solution in a test tube for use;

[0041] (2) Sodium chloride, sulfamic acid, p-aminobenzenesulfonic acid, naphthylethylenediamine hydrochloride, and vanadium trichloride are uniformly mixed in a ratio of 400:20:25:0.9:0.6 to obtain a mixed powder;

[0042] (3) Weigh 0.3g of mixed powder into 3mL of sample solution, shake well, take a water bath at 80°C for 30min, cool, measure the absorbance value, and calculate the nitrate content according to the standard curve.

[0043] 2. The theoretical basis of the above method is as follows:

[0044]Under acidic conditions, using a compound with reducing activity - vanadium trichloride, the...

Embodiment 3

[0052] Example 3 Assay conditions optimization

[0053] 1. The effect of vanadium chloride dosage on absorbance value

[0054] (1) Take a set of 5 mL test tubes with stopper scale, add 3 mL of standard nitrate solution with a concentration of 1.5 mg / L in turn, and take 5 parts consisting of 0.5 g sodium chloride, 0.085 g sulfamic acid, 0.025 g p-aminobenzenesulfonic acid , 0.9mg mixed powder composed of naphthalene ethylenediamine hydrochloride, respectively add 0.3mg, 0.6mg, 0.9mg, 1.2mg, 1.5mg vanadium chloride to prepare 5 mixed powders containing different amounts of vanadium chloride, and then add In each test tube (with the sample solution in the test tube), shake until the powder is completely dissolved in the sample solution, take a water bath at 80°C for 30 minutes, take it out and cool it, and measure the absorbance value. The above steps are repeated 3 times.

[0055] (2) Replace the 1.5 mg / L nitrate standard solution in the above steps with a series of stand...

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Abstract

The invention discloses a vanadium trichloride mixed powder and the application thereof in quickly measuring the nitrate content in the food. The vanadium trichloride mixed powder is composed of sodium chloride, sulfamic acid, sulfanilic acid, naphthyl ethylenediamine hydrochloride and vanadium trichloride. When the vanadium trichloride mixed powder is applied to quickly measure the nitrate content in the food, firstly, the food is homogenized and then metered in volume by using the acetic acid solution. After that, the homogenized food is oscillated and filtered to obtain a sample solution. Secondly, the vanadium trichloride mixed powder is added into the sample solution, and the obtained product is shaken uniformly, subjected to water bath and cooled. The light absorption value of the obtained product is measured and then the nitrate content is calculated according to a standard curve. According to the technical scheme of the invention, the method is simple and easy to operate, fast, short in consumed time, sensitive, accurate, small in reagent consumption, and low in cost. Meanwhile, an operator can master the method without being specially trained. Moreover, reagents adopted in the method are not volatilized, free of odors and extremely small in toxicity to human bodies. The mixed power is good in stability. The detection reagent is harmless to the environment and human bodies. Therefore, the vanadium trichloride mixed powder has a wide application prospect in detecting the nitrate content in the rapid detection field of food especially the rapid detection field of fresh vegetables.

Description

technical field [0001] The invention belongs to the technical field of food safety detection. More specifically, it relates to a vanadium trichloride mixed powder and its application in the rapid determination of nitrate content in food. Background technique [0002] Nitrate widely exists in people's life, 81.2% of the nitrate ingested by the human body comes from vegetables, followed by water and beverages and cured meat products. The nitrate in fresh vegetables mainly comes from the excessive application of nitrogen fertilizer during the planting process, and excessive application of nitrogen fertilizer will pollute the water body, resulting in excessive nitrate content in the water body; nitrate itself is one of the natural components in the plant, the US Food and Drug Administration The Administration (FDA) lists nitrate as a safe food additive, which itself has no direct harm to the body, but bacteria in plants, human mouth and intestines can reduce nitrate to nitrite,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 吴青翁柔丹孙远明雷红涛卢慧茵刘琦
Owner SOUTH CHINA AGRI UNIV
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