Table 2.

MS/MS ions and parameters.

Analyte	Mass transition	Fragmentation Voltage	Collision Energy
GSH-mBrB	498.2>435.1	185 V	21 V
	498.2>192.1	185V	45 V
GSH-mBrB (13C 15N)	501.2>438.1	185 V	21 V
	501.2>192.1	185 V	45 V
GSSG	613>355	190 V	22 V
	613>484	190 V	15 V
GSSG (13C 15N)	619>361	190 V	22 V
	619>490	190 V	15 V