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Detection method of residual sodium thiocyanate in milk

A technology of sodium thiocyanate and milk, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc. problems such as the accuracy of test results, to achieve the effect of high accuracy and simple analysis process

Inactive Publication Date: 2017-01-04
四川新华西乳业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At the same time, in the existing sodium thiocyanate kit testing project, it is necessary to compare different test results with the color comparison card provided by the kit. Due to the use environment or printing quality problems, the accuracy of the color comparison card is low , thus affecting the accuracy of the test results of sodium thiocyanate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Prepare sodium thiocyanate standard solution for standard addition experiments. Marking points with different concentrations are made, and the color comparison between the sample detection results and the spiked experiment results can determine whether the content of sodium thiocyanate in milk is lower than the concentration of the marking point.

[0031] It has been verified through multiple experiments that this method can more accurately determine the content of sodium thiocyanate in milk than the colorimetric method of the kit itself.

Embodiment 2

[0033] Use the sodium thiocyanate standard solution prepared in Example 1. Take 1mL raw milk sample with a straw and place it in a 5mL centrifuge tube, prepare 5 replicate samples, and add 1ppm, 2ppm, 3ppm, 4ppm, 5ppm sodium thiocyanate to the remaining 5 sufficient samples respectively. Then, add 2 mL of sodium thiocyanate detection reagent A respectively, shake about 50 times, and centrifuge for 30 seconds to separate the liquid in the centrifuge tube. Aspirate 1mL of the supernatant in the centrifuge tube, transfer it to another 5mL centrifuge tube, add 2 drops of sodium thiocyanate detection reagent B, shake the centrifuge tube, and observe the results after 1 minute. According to the color concentration of the test sample and the grade difference level of the spiked sample, the content level range of sodium thiocyanate in the milk is determined.

Embodiment 3

[0035]The detection process is the same as in Example 2, but the amount of reagents and milk used in each step of the kit is halved, as follows. Use a straw to draw 0.5mL raw milk sample into a 5mL centrifuge tube, prepare 5 replicate samples, and add 1ppm, 2ppm, 3ppm, 4ppm, 5ppm sodium thiocyanate to the remaining 5 sufficient samples. Then, add 1 mL of sodium thiocyanate detection reagent A respectively, shake about 50 times, and centrifuge for 30 seconds to separate the liquid in the centrifuge tube. Aspirate 0.5mL of the supernatant in the centrifuge tube, transfer it to another 5mL centrifuge tube, add 1 drop of sodium thiocyanate detection reagent B, shake the centrifuge tube, and observe the results after 2 minutes. According to the color concentration of the test sample and the grade difference level of the spiked sample, the content level range of sodium thiocyanate in the milk is determined. While ensuring the accuracy of the test results, the kit that originally co...

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Abstract

The invention discloses a detection analysis method of sodium thiocyanate. The method comprises the following steps: (1) preparing a sodium thiocyanate standard solution; (2) dividing milk samples into a detection sample and a sample to be labeled, adding the sodium thiocyanate standard solution into the sample to be labeled to obtain a labeled sample; (3) respectively adding a sodium thiocyanate detection reagent A into the detection sample and the labeled sample, shaking for uniformly mixing, collecting supernatant, adding a sodium thiocyanate reagent B, and uniformly shaking; and (4) comparing the detection sample with the labeled sample, observing and analyzing the color of the detection sample relative to the labeled sample, and determining the content of the sodium thiocyanate in the detection sample by virtue of a labeling amount of the labeled sample. The monitoring analysis method integrates the high speed of an ordinary kit detection method and high precision of a chromatographic analysis method, and has good effect for improving the detection and analysis efficiency and detection and analysis precision.

Description

technical field [0001] The invention relates to a method for detecting chemical components, in particular to a method for detecting sodium thiocyanate in milk, belonging to the field of dairy products. Background technique [0002] In 2015, there was a food safety incident in which sodium thiocyanate was detected in milk exceeding the maximum limit value. Due to the bad influence of the "melamine" incident in previous years, this incident quickly became the focus of the society, dairy companies, relevant government departments, and media. hotspots. Ordinary consumers and social media did not know the name of the chemical, heard the word "cyanide" and quickly associated it with "melamine", which caused widespread panic among consumers and social shocks, and severely hit consumers for domestic chemical products. Dairy business confidence. [0003] Sodium thiocyanate was originally a common chemical raw material used in various industries such as medicine, printing and dyeing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 骆敏何桃廖雪梅
Owner 四川新华西乳业有限公司
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