Method for detecting 1,2-propanediol in liquid milk

Abstract

The invention provides a method for detecting 1,2-propanediol in liquid milk. The method includes the following steps. The method includes the following steps: a. The liquid milk sample is detected by proton nuclear magnetic resonance spectroscopy to obtain the liquid milk sample 1 H-NMR collection of illustrative plates; B, screen the liquid milk sample 1 The methyl proton signal of 1,2-propanediol in the H-NMR collection of spectra obtains a positive sample; c, the methyl proton signal in the positive sample is selectively excited to obtain a 1D-TOCSY collection of spectra, if the 1D ‑TOCSY spectrum data compared to 1,2‑propanediol standard 1 If the H-NMR spectrum data are consistent, then the liquid milk sample contains 1,2-propylene glycol. For the implementation of the above technical solution, the presence and content of 1,2-propylene glycol in liquid milk can be quickly and accurately detected. In particular, the detection method of the present invention has excellent detection precision, stability, reproducibility and recovery rate, which can provide technical support for formula development, product production, quality control and safety detection of liquid milk in the future.

Description

technical field [0001] The technical solution of the present invention belongs to the field of food detection, specifically to the field of detection of added components of dairy products, and in particular, relates to a method for detecting 1,2-propanediol in liquid milk. Background technique [0002] GB2760-2014 "National Food Safety Standard Food Additive Use Standard" stipulates that no spices and flavors should be added to pasteurized milk and sterilized milk. Therefore, testing institutions, etc. should test whether milk-flavored flavors and flavors are contained in liquid milk. However, there are various formulas of milk-flavored spices and flavors, and the ingredients contained range from a few to hundreds of kinds. Operability is not strong. [0003] 1,2-propanediol (1,2-propanediol) is an excellent solvent commonly used in food flavors and fragrances in the food industry, and it is also a food synthetic fragrance specified in the food additive standards. It is co...

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Problems solved by technology

[0018] In view of the technical problems existing in the prior art, for example: pretreatment requires steps such as vortexing and standing still, the process is time-consuming and labor-intensive; the sampling volume is large and the solvent consumption is high; environmental friendliness and economy are poor; the instrument detection time is long, At the same time, standard curve quantification is required, and the detection efficiency is low; the qualitative ability is poor, and false positive results are prone to occur; there will be a risk of interference from other structural analogues in the matrix, which will affect the accuracy of qualitative and quantitative results, etc.

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