Fructus lycii pretreatment method during stable isotope measurement of fructus lycii dried fruits

Abstract

The invention relates to the technical field of traceability detection, in particular to a fructus lycii pretreatment method during stable isotope measurement of fructus lycii dried fruits. The methodcomprises the following steps: 1): flatly paving multiple fructus lycii dried fruit samples in a glass culture dish; 2): vacuum drying the fructus lycii dried fruit samples obtained in the step 1 for24-30h at a temperature of 65-75 DEG C and a vacuum degree of 100 KPa; 3): placing the fructus lycii dried fruit samples obtained in the step 2 in a dryer for 30min to cool the same to the room temperature; 4): performing a milling treatment on the fructus lycii dried fruit samples obtained in the step 3 by using a micromill at a milling time length of 2-5s; 5): packaging fructus lycii powder obtained in the step 4 in a valve bag, and continuing to place the fructus lycii powder in the dryer for drying; and 6): sieving the fructus lycii powder obtained in the step 5 with a 60-mesh sieve, packaging the fructus lycii powder in the valve bag, storing the valve bag in the dryer, and directly sampling for measurement during the isotope measurement. The fructus lycii dried fruit powder treatedby the technical scheme provided by the invention can meet the requirements of a stable isotope mass spectrometer, and the measurement result is stable and accurate.

Description

technical field [0001] The invention relates to the technical field of traceability detection, in particular to a pretreatment method for stable isotope determination of dried wolfberry. Background technique [0002] Traceability detection technology is to identify the authenticity of the product through some physical, chemical and biological methods, and at the same time trace the product's variety, breeding system and geographical origin. information in storage. At present, a series of methods have been established abroad to trace the source of products, including plant labeling method, DNA labeling method, near-infrared reflectance spectroscopy, stable isotope method, etc. Among them, the stable isotope method is non-radioactive, will not cause secondary pollution, and is traceable. It is widely used in the traceability system of agricultural products for reasons such as remarkable effect. Due to the fact that various stable isotopes in organisms are affected by climate...

AI Technical Summary

Problems solved by technology

The current goji berry market cannot be stored for a long time due to the perishability and mildew of fresh goji berries. It is basically sold and circulated in the form of dried fruits, and there are phenomena such as unclear origin of origin and doubts about the authenticity of geographical labels. Therefore, the stabilization of dried goji berries is carried out. Isotope traceability research is of great research significance, in order to achieve the goal of determining the origin of wolfberry and verifying the authenticity of label declarations

[0003] Due to the high precision and sensitivity of the instruments for measuring stable isotopes, the solid samples must be dry and homogeneous before being tested. However, since Chinese wolfberry is a product with high sugar content, it should be dried in the shade below 60°C in a conventional way. After air-drying or hot air treatment, there will be agglomeration and agglomeration in the powder after grinding, so it cannot meet the requirements of stable isotope sampling. This phenomenon is more obvious in the summer and autumn of the wolfberry production season. Research on pre-processing methods