Determination of L-Ergothioneine in Cosmetics Based on Ultraperformance Liquid Chromatography-Tandem Mass Spectrometry

Table 1

MRM parameters of L-EGT.

Precursor ion (m/z)	Product ion (m/z)	Collision energy (eV)	Dwell time (ms)
230.07	186.06	18	200
	127.01	26	200

The product ion with () was used for quantification.