Near infrared spectrum qualitative identification method of pearl powder and shell powder

Abstract

The invention provides a near infrared spectrum qualitative identification method of pearl powder and shell powder. The near infrared spectrum qualitative identification method comprises the following steps of firstly, collecting near infrared spectrograms of a plurality of pearl powder samples and a plurality of shell powder samples as a pearl powder correction set and a shell powder correction set; then, establishing a discrimination analysis model by virtue of near infrared spectrum analysis software for setting model parameters according to the correction sets, wherein optical length types are selected for multi-element signal correction, spectrum pre-treatment is performed by virtue of a second derivative, smoothness is performed by virtue of Norris derivative filtering, a correction spectrum region is in a range of 4100-9800 cm<1> and the like; and finally, by virtue of the near infrared spectrograms of the samples to be detected and the established discrimination analysis model, analyzing the mahalanobis distance between the near infrared spectrograms of the samples to be detected and the pearl powder correction set, and the mahalanobis distance between the near infrared spectrograms of the samples to be detected and the shell powder correction set, and automatically giving an identification result by the near infrared spectrum software. The near infrared spectrum qualitative identification method provided by the invention is simple, convenient, fast and reliable.

Description

technical field [0001] The invention relates to a near-infrared spectrum qualitative identification method for pearl powder and shell powder. Background technique [0002] In recent years, pearl powder, which is a precious traditional Chinese medicine, has been favored in medicine, health food, beauty cosmetics and other industries. The types of products on the market have become more abundant, the application fields have been continuously expanded, and the economic value has been increasing. However, counterfeit and shoddy pearl powder has also emerged as the times require. Mother-of-pearl shells and pearls have the same root, and the microscopic morphology and chemical composition of mother-of-pearl shell powder are similar to pearl powder. They often pass off as pearl powder and flow into the market, seriously disrupting the order of the pearl powder market and hindering the healthy development of the pearl powder industry. [0003] Existing studies use methods such as th...

AI Technical Summary

Problems solved by technology

Mother-of-pearl shells and pearls have the same root. The microscopic appearance and chemical composition of mother-of-pearl shell powder are similar to those of pearl powder. They often pass off as pearl powder and flow into the market, seriously disrupting the order of the pearl powder market and hindering the healthy development of the pearl powder industry.

[0003] Existing studies use methods such as thermal analysis, X-ray diffraction, infrared spectroscopy, and scanning electron microscopy to identify differences in the crystal phase structure, microscopic morphology, and organic matter content of mother-of-pearl shell powder, that is, shell powder and pearl powder. It cannot effectively identify shell powder and pearl powder, and the analysis of crystal phase structure and organic matter usually requires high-temperature treatment of pearl powder and shell powder to study the transformation difference before and after treatment to achieve identification

These methods usually require sophisticated preprocessing equipment or accessories and large analytical instruments for analysis and data processing, while heat treatment and subsequent data processing take a certain amount of time, so these methods do not have the characteristics of quickness and simplicity.

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