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Rapid testing method of carbonates in fresh milk

A detection method, carbonate technology, which is applied in the direction of material analysis through observation of the influence of chemical indicators, and analysis through chemical reactions of materials, etc., which can solve the problem of low color discrimination and color development in the rose red acid method Inconspicuous, cumbersome and other problems, to achieve the effect of good visual effect, high color distinction and simple operation

Inactive Publication Date: 2012-05-23
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the bromothymol blue method has relatively strict requirements on the operation and needs to be slowly added along the wall. If the chromogenic agent is miscible with milk, it is difficult to distinguish the color circle and reduce the detection effect; Obviously; the electronic nose method requires the use of high-end instruments, the detection effect is closely related to the performance of the instrument, and a relatively complete model curve needs to be established before use, which is relatively cumbersome and not suitable for promotion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: 1) Take a group of clean colorimetric tubes, add 10mL blank milk sample to it respectively, and then add 0.1g of NaHCO to each blank milk sample 3 or Na 2 CO 3 Make a 1% adulterated sample, and then sequentially dilute into a series of gradient mixed carbonate concentration samples;

[0017] 2) Add a phenol red solution with a mass concentration of 0.05% to the sample with increasing concentration gradient, and observe the color change immediately after shaking well. The volume ratio of the sample to the phenol red solution is 5:1;

[0018] 3) According to the different colors that appear, the carbonate content in the milk sample is corresponding to the color, and prepared into a color comparison card;

[0019] 4) Take the milk sample to be tested, and add a phenol red solution with a mass concentration of 0.05% to the milk sample to be tested. The volume ratio of the milk sample to be tested and the phenol red solution is 5:1. Compare the color with the c...

Embodiment 2

[0020] Example 2: 1) Take a group of clean colorimetric tubes, add 10mL blank milk sample to it respectively, and then add 0.1g of NaHCO to each blank milk sample 3 or Na 2 CO 3 Make a 1% adulterated sample, and then sequentially dilute into a series of gradient mixed carbonate concentration samples;

[0021] 2) Add a phenol red solution with a mass concentration of 0.5% to the sample with an increasing concentration gradient, and observe the color change immediately after shaking well. The volume ratio of the sample to the phenol red solution is 5:1;

[0022] 3) According to the different colors that appear, the carbonate content in the milk sample is corresponding to the color, and prepared into a color comparison card;

[0023] 4) Take the milk sample to be tested, and add a phenol red solution with a mass concentration of 0.5% to the milk sample to be tested. The volume ratio of the milk sample to be tested to the phenol red solution is 5:1. Compare the color with the c...

Embodiment 3

[0024] Example 3: 1) Take a group of clean colorimetric tubes, add 10mL blank milk sample to it respectively, and then add 0.1g of NaHCO to each blank milk sample 3 or Na 2 CO 3 Make a 1% adulterated sample, and then sequentially dilute into a series of gradient mixed carbonate concentration samples;

[0025] 2) Add a phenol red solution with a mass concentration of 0.1% to the sample with increasing concentration gradient, observe the color change immediately after shaking well, the volume ratio of said sample to phenol red solution is 5:1;

[0026] 3) According to the different colors that appear, the carbonate content in the milk sample is corresponding to the color, and prepared into a color comparison card;

[0027] 4) Take the milk sample to be tested, add a phenol red solution with a mass concentration of 0.1% to the milk sample to be tested, the volume ratio of the milk sample to be tested and the phenol red solution is 5:1, and the Compare the color with the color ...

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Abstract

The invention discloses a rapid testing method of carbonates in fresh milk, belonging to the food rapid testing field. The method can be successfully used for the rapid testing of carbonates in fresh milk. The method is based on the phenol red developing principle, the indexing of the reaction developing areas of milk samples containing different contents of carbonates is good, and the sensitivity is high. The reagents used in the method are cheap, the operation procedures are simple, the developing effect is good and the detection lower limit is 0.05%. The prepared reagent of the invention can be stored for at least half a year while the detection sensitivity is not influenced and be applicable to the on-site qualitative and half-quantitative detection.

Description

technical field [0001] The invention belongs to the field of food testing and relates to a method for quickly detecting adulteration of fresh milk, in particular to a method for quickly detecting carbonate in fresh milk. Background technique [0002] At present, the quality and safety situation of the dairy market is not optimistic, and adulteration and fraud are intensifying, especially the melamine incident has brought great harm to consumers. After the Sanlu incident, industry insiders and consumers are very concerned about the quality of dairy products. The key issue of dairy quality is the purity of milk source. In fact, the problem of adulteration of fresh milk has a long history. As early as more than ten years ago, there was a case of Qingliangshan brand milk powder poisoning a baby because of raw milk mixed with nitrite. Protein powder (products obtained by acid hydrolysis of old leather shoes, belts, leather bags, etc.) is added to milk mixed with water to increas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78
Inventor 董文宾李卓曾桥杨津李娜王金子南雪梅
Owner SHAANXI UNIV OF SCI & TECH
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