Method for identifying and quantitatively analyzing adulteration in Chinese prickly ash by using nuclear magnetic resonance hydrogen spectrum

Abstract

The invention relates to the technical field of food detection, in particular to a method for identifying and quantitatively analyzing adulteration in zanthoxylum bungeanum by using nuclear magnetic resonance hydrogen spectrum.The method comprises the steps that after a zanthoxylum bungeanum sample is subjected to deuterated chloroform extraction, a hydrogen spectrum signal is tested; the obtained hydrogen spectrum data is subjected to peak displacement correction, data binning and normalization processing, a random forest model is established, and a test standard for judging oil doping or pepper doping is formed. And according to a random forest model discrimination result, respectively finding oil-doped and Shandong pepper-doped difference marker signals. Linear fitting is carried out on the pepper difference marker signals of different oil doping amounts or pepper doping amounts and the oil doping amounts or the pepper doping amounts to obtain the relation between the peak area and the oil doping amounts or the pepper doping amounts, and the relation can be used for quantitatively analyzing the oil doping amounts or the pepper doping amounts in the peppers; the problems that an existing sensory evaluation method adopted for pepper adulteration identification has high professional requirements for reviews, the evaluation result is easily interfered by external factors, and adulteration cannot be accurately quantified are solved.

Description

technical field [0001] The invention relates to the technical field of food detection, in particular to a method for identifying and quantitatively analyzing adulteration in prickly ash by using hydrogen nuclear magnetic resonance spectrum. Background technique [0002] Zanthoxylum bungeanum is a plant of the genus Zanthoxylum bungeanum in Rutaceae, which has a wide planting area and a long history of planting in my country. As a unique food spice, Zanthoxylum bungeanum is widely used in food processing. There are many active ingredients in Zanthoxylum bungeanum, including volatile oil, numb substances, alkaloids and flavonoids. Because of its rich metabolites, Zanthoxylum bungeanum not only has a unique flavor, but also has the effects of improving skin, lowering blood fat, inhibiting bacteria, and anti-inflammation. [0003] Due to the increase in market demand for peppercorns, adulteration has become profitable. Unscrupulous merchants have mixed salad oil into peppercor...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the existing sensory evaluation method used for the identification of pepper mixed with oil and Shandong peppercorns has high professional requirements for the reviewers, and the evaluation results are easily interfered by external factors, and it is impossible to determine the false oil. , providing a method for identification and quantitative analysis of adulteration in pepper by using proton nuclear magnetic resonance spectroscopy

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