Table 4.
Qualitative analytical condition for preservatives by LC/MS/MS

Preservatives1)	MRM2)	CV3)	CE4)
DHA	167.26 > 083.27	20	22
SA	111.13 > 067.40	20	12
BA	121.19 > 077.31	20	16
POBM	151.25 > 092.31	30	24
POBE	165.25 > 137.07	25	18
POBIP	179.26 > 137.11	30	20
POBP	179.26 > 092.37	30	28
POBIB	193.32 > 092.24	35	30
POBB	193.33 > 092.37	35	32

DHA : Sodium Dehydroacetate, SA : Sorbic acid, BA : Benzoic acid, POBM : Methyl p-Hydroxybenzoate, POBE : Ethyl p-Hydroxybenzoate, POBIP : Isopropyl p-Hydroxybenzoate, POBP : Propyl p-Hydroxybenzoate, POBIB : Isobutyl p-Hydroxybenzoate, POBB : Butyl p-Hydroxybenzoate
MRM : Mutiple Reaction Monitoring
CV : Collision Voltage
CE : Collision Energy