Using the Doubly Charged Selected Ion Coupled with MS/MS Fragments Monitoring (DCSI-MS/MS) Mode for the Identification of Gelatin Species

Table 1

Retention times and fragments of characterized species-specific peptides from each gelatin.

m/z observed	Retention times	Fragments	Sequence	Originated from
765.8	17.9	1084.7, 991.7, 823.6, 609.3	GEAGPAGPAGPIGPVGAR	Donkey-hide gelatin
641.8	7.1	1107.6, 967.6, 783.6, 726.5, 632.4, 548.3	GEAGPSGPAGPTGAR	Bovine-hide gelatin
924.5	11.3	1122.5, 1011.5, 832.6, 747.9,	GEPGPTGVQGPPGPAGEEGK	Pig-hide gelatin
758.8	18.0	1133.7, 954.4, 849.4, 748.7, 615.5, 544.3	GDGGPP(OH)GITGFPGASGR	Glue of tortoise shell
733.4	10.4	1090.5, 962.5, 875.5, 818.5, 723.9, 629.3	SGETGASGPP(OH)GFAGEK	Deerhorn glue