Table 2.

LC-ESI-QqTOF-MS/MS analysis of the glycated peptide EK*VLTSSAR (Lys 211) at m/z 752.4233 (+2)

Molecular ion	Calculated	Experimental	Deviation
	m/z	m/z	Da
Y+	1242.6683	1242.6794	0.0111
Z+	1224.6577	1224.6785	0.0208
[y8 − B]+	1113.6252	1113.6384	0.0132
[b8 − B]+	1068.5572	1068.5932	0.0360
[b7 − B]+	997.5201	997.5436	0.0235
[b6 − B]+	910.4880	910.5089	0.0209
[b5 − B]+	823.4560	823.4703	0.0143
[b5 − B − H2O]+	805.4454	805.4549	0.0095
${\mathrm{y}}_7^{+}$	733.4197	733.4340	0.0143
[b4 − B]+	722.4083	722.4164	0.0081
[b4 − B − H2O]+	704.3977	704.4081	0.0104
${\mathrm{y}}_6^{+}$	634.3513	634.3576	0.0063
[b3 − B]+	609.3243	609.3292	0.0049
[b3 − B − H2O]+	591.3137	591.3171	0.0034
${\mathrm{y}}_5^{+}$	521.2673	521.2713	0.0040
[b2 − B]+	510.2558	510.2563	0.0005
[b2 − B − H2O]+	492.2452	492.2474	0.0022
${\mathrm{y}}_4^{+}$	420.2196	420.2190	−0.0006
${\mathrm{C}}_{17}{\mathrm{H}}_{26}{\mathrm{N}}_3{\mathrm{O}}_4^{+}$	336.1918	336.1918	0.0000
${\mathrm{y}}_3^{+}$	333.1875	333.1851	−0.0024
B+	262.1290	262.1265	−0.0025
[B − H2O]+	244.1179	244.1142	−0.0037
[B − 2H2O]+	226.1079	226.1047	−0.0032
${\mathrm{C}}_{11}{\mathrm{H}}_{16}{\mathrm{N}}_3{\mathrm{O}}_2^{+}$	222.1237	222.1187	−0.0050
${\mathrm{y}}_1^{+}$	175.1184	175.1162	−0.0022
[2,5A − 2H2O]+	152.0706	152.0663	−0.0043
[B − C4H6O3]+	142.0863	142.0815	−0.0048
[2,5A − CH4O3]+	124.0757	124.0708	−0.0049