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Low field nuclear magnetic resonance detection method of edible gelatin quality

A technology of low-field nuclear magnetic resonance and edible gelatin, which is applied in the direction of analysis by nuclear magnetic resonance, and can solve problems such as the quality identification of gelatin that has not been seen in low-field nuclear magnetic resonance

Inactive Publication Date: 2015-05-27
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

[0005] Low-field nuclear magnetic resonance (LF-NMR) is a new type of nondestructive testing technology, mainly through the longitudinal relaxation time (T 1 ), the transverse relaxation time (T 2 ), diffusion coefficient and CPMG (Carr-Purce1l-Meiboom-Gill) echo data for qualitative and quantitative analysis of substances. There is no report on the quality identification of gelatin by low-field NMR technology

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  • Low field nuclear magnetic resonance detection method of edible gelatin quality
  • Low field nuclear magnetic resonance detection method of edible gelatin quality
  • Low field nuclear magnetic resonance detection method of edible gelatin quality

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Embodiment Construction

[0029] (1) Preparation of gelatin solution

[0030] Weigh a certain quality of pure edible gelatin in a beaker, add a certain volume of distilled water, wherein the mass volume concentration of edible gelatin and distilled water is 25%, and make the edible gelatin swell in distilled water for 2 hours. Place the beaker in a constant temperature water bath at 65°C for 15 minutes, and stir during the water bath to ensure that the gelatin is completely dissolved. The preparation method of other gelatin solutions is the same as the preparation method of this edible gelatin solution. According to 1%-9% and 10%-90% adulterated mass fractions, the industrial gelatin is mixed into various edible gelatins respectively, and the preparation method of the adulterated sample solution is the same as that of the pure edible gelatin solution.

[0031] (2) Establishment of a database for the relaxation information of edible gelatin in low-field NMR

[0032] Take 3ml of the gelatin solution pr...

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Abstract

The invention discloses a low field nuclear magnetic resonance detection method of edible gelatin quality. The method comprises the following steps: a, after edible gelatin and technical gelatin are dissolved in distilled eater according to 25% of water massic volume concentration, low field nuclear magnetic resonance detection is carried out so as to obtain low field nuclear magnetic resonance relaxation spectrum information of pure gelatin; a series of edible gelatin adulteration samples doped with different mass percentages of technical gelatin are prepared and low field nuclear magnetic resonance detection is carried out to obtain low field nuclear magnetic resonance relaxation spectrum information of each adulteration sample, and a low field nuclear magnetic resonance relaxation spectrum information database of edible gelatin is established; and b, gelatin samples to be detected undergo low field nuclear magnetic resonance detection, and obtained relaxation spectrum information and the relaxation spectrum information in the low field nuclear magnetic resonance relaxation spectrum information database of edible gelatin are analyzed and compared, and whether technical gelatin is doped in the edible gelatin to be detected is determined. The method provided by the invention has advantages of high accuracy of measuring results, good repeatability, good stability, low time consumption and the like.

Description

technical field [0001] The invention relates to a method for detecting food additives, in particular to a method for using low-field nuclear magnetic resonance spectrum information to identify edible gelatin and industrial gelatin, and to detect the adulterated amount of industrial gelatin in edible gelatin. Background technique [0002] Edible gelatin is a hydrolyzed product of collagen, fat-free and high-protein, and is a legal food additive stipulated by the state. It is widely used in various food industries as gelling agent, stabilizer, thickener, etc. Industrial gelatin is the gelatin extracted from waste leather after tanning in the tanning industry or scraps cut from tanned leather. It is inevitably mixed with impurities such as heavy metals and chemicals, which are potentially harmful to human health. [0003] The exposure of the "poisonous capsule" incident and the "leather shoe yogurt" incident in 2012 shows that industrial gelatin has flowed to the pharmaceutical...

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Application Information

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IPC IPC(8): G01N24/08
Inventor 王欣黄远芬夏义苗刘宝林
Owner UNIV OF SHANGHAI FOR SCI & TECH
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