Analyses of Spinosad and Its Degradates from Light Irradiation

Abstract

Abstract: In this paper we report 5-stage mass spectrum fragmentations of spinosad A and D. Degrading rate of spinosad under ultraviolet light irradiation was also investigated with selection reaction monitoring(SRM) mode. Degradates of spinosad were analyzed with liquid chromatography coupling with mass spectrometry, and the chemical structures of main degradates were also assigned. It can be concluded that (1) forosamine on 17-carbon can be easily lost, but difficult for rhamnose sugar; (2) spinosad concentration decreased when irradiation time increased, degrading rate was up to about 70% for irradiating 484 min, and 11 degradates were produced. These degradates were products of the oxidation, reduction, and hydrolytic reactions.

Key words: Spinosad, Liquid chromatography-mass spectrometry, Light irradiation, Degradation

CLC Number:

O657.63

TrendMD:

YANG Cheng-Dui*, SONG Li-Hui. Analyses of Spinosad and Its Degradates from Light Irradiation[J]. Chem. J. Chinese Universities, doi: .

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Analyses of Spinosad and Its Degradates from Light Irradiation

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