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Method for rapidly judging adulteration of milk by virtue of mid-infrared spectrum

A technology of infrared spectroscopy and infrared spectrometer, which is applied in the field of milk quality inspection, can solve the problems of costing a lot of time and cost, being unable to effectively reject, and not being able to monitor quickly, so as to save detection time, save detection cost, and enhance practical operability Effect

Inactive Publication Date: 2016-11-23
SHANGHAI MINHANG HIGH SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complex types of illegally added foreign matter, the quality inspection of milk has become a cumbersome, time-consuming and cost-intensive task
Due to the complicated pre-treatment, it is impossible to realize rapid on-site monitoring when purchasing milk, and it is also impossible to effectively reject unqualified milk or quickly detect whether foreign matter is mixed in the finished milk

Method used

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  • Method for rapidly judging adulteration of milk by virtue of mid-infrared spectrum
  • Method for rapidly judging adulteration of milk by virtue of mid-infrared spectrum
  • Method for rapidly judging adulteration of milk by virtue of mid-infrared spectrum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Contrast experiment between pure milk and milk mixed with different amounts of water

[0040] Deduction of background: The samples to be tested are: 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100% of the water added respectively pasteurized milk.

[0041] See figure 1 shown.

[0042] Spectrograms produced by comparing finely amplified water features from 1200-950 wavenumbers see figure 2 As shown, the amount of water added can be judged according to the trend of deviation from the straight line.

[0043] Summary of conclusions at this stage: This method can be used to identify milk with an amount as low as 5% water, and there are obvious differences in the spectra after subtracting the standard milk as the background.

Embodiment 2

[0045] Contrast experiment of pure milk with different proportions of water mixed with melamine

[0046] Let the mass percentage of water be X, and the mass of melamine to be added is y (g)

[0047] y=3 / 2[2.95%*(1+x)*10*16%-2.95%*10*16%]

[0048] That is, y=3 / 2*2.95%*10*16%*X

[0049] Percentage of water (in 10g milk)

The mass of melamine added (g)

10％

0.00708

20％

0.01416

30％

0.02124

40％

0.02832

50％

0.0354

60％

0.04248

70％

0.04956

75％

0.0531

80％

0.05664

90％

0.06372

100％

0.0708

[0050] Because melamine is slightly soluble in water, the solubility at room temperature is 3.1 g / L. That is to say, 10 milliliters of water can dissolve 0.031 grams of melamine, contain 0.02 grams of nitrogen, which is equivalent to 0.127 grams of protein. From this, it can be calculated that to meet the requirement of 10 milliliters ≥ 0.295 grams of protein, 10 milliliters of milk c...

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Abstract

The invention discloses a method for rapidly judging adulteration of milk by virtue of a mid-infrared spectrum. The method comprises the following steps: qualitatively analyzing a to-be-tested milk sample by virtue of the mid-infrared spectrum, performing spectrogram comparison on the to-be-tested sample and a set background, and rapidly judging whether the milk contains an adulterant or not according to a waveform difference of spectrograms. The judgment method is simple and rapid, whether the milk contains an abnormal additive or not can be rapidly identified within less than 1 minute, a raw milk purchasing link can be rapidly shortened, and a qualified milk source can be guaranteed to be timely and rapidly purchased in the dairy industry.

Description

technical field [0001] The invention belongs to milk quality detection technology, in particular to a method for quickly judging whether milk is adulterated by using mid-infrared spectrum. Background technique [0002] At present, due to the widespread fraud in the food industry, my country has established a relatively complete food supervision system, but there are still many bad cases in the dairy industry. The reason is that the ingredients of dairy products are relatively complex. Difficult to identify its own components and added foreign matter. Some lawbreakers take advantage of the current inability to quickly and qualitatively identify illegal additives to carry out counterfeiting, such as: mixing milk with water, goat milk, soybean milk, melamine, etc. Due to the complex types of illegally added foreign matter, the quality inspection of milk has become a tedious task that requires a lot of time and cost. Due to the complicated pre-treatment, it is impossible to rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3577
Inventor 顾秋辉吉啸宇
Owner SHANGHAI MINHANG HIGH SCHOOL
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