1924
ZENKEVICH, PUSHKAREVA
Table 2. (Contd.)
Amino acid (М) RI(BPX-1)/RI(RTX-5)
Reaction product: m/z ≥ 40 (Irel ≥ 2%)
Lysine (146→270)
1961±2/1994±13
Lys-bis-N-DMAM-Me: 270 [M], 226 (3), 211 (3) [M – CO2CH3], 200 (3), 199
(8), 198 (4), 166 (5), 165 (4), 157 (6), 156 (2), 154 (2), 144 (3), 143 (6), 140
(4), 139 (19), 137 (2), 129 (2), 128 (31), 127 (17), 125 (4), 114 (4), 113 (4),
112 (18), 111 (9), 100 (3), 99 (15), 98 (4), 97 (6), 96 (3), 94 (3), 86 (13), 85
(29), 84 (11), 83 (5), 82 (3), 73 (15), 72 (10), 71 (11), 70 (100) [Me2N–CN],
69 (7), 68 (4), 67 (3), 59 (2), 58 (7), 57 (14), 56 (6), 55 (3), 54 (2), 46 (34), 45
(8), 44 (82) [NMe2], 43 (7), 42 (28), 41 (7)
Glutamic acid
(147→230)
1578±2/1637±2
1581±2/1638±2
Glu-N-DMAM-Me2: 230 (11) [M], 199 (10), 198 (4), 172 (4), 171 (48) [M –
CO2CH3], 170 (20), 169 (4), 158 (2), 157 (29), 155 (11), 143 (12), 141 (2),
139 (8), 128 (2), 112 (9), 111 (100) [M – CO2CH3 – HCO2CH3], 100 (2), 99
(4), 98 (3), 97 (10), 96 (2), 95 (2), 85 (7), 84 (7), 83 (5), 82 (2), 74 (2), 73
(16), 72 (6), 71 (8), 70 (9), 69 (2), 68 (5), 59 (6), 58 (3), 57 (18), 56 (6), 55 (4),
54 (3), 46 (21), 45 (8), 44 (88) [NMe2], 43 (7), 42 (38), 41 (12), 40 (2), 39 (3)
Methionine
(149→218)
Met-N-DMAM-Me: 218 (5) [M], 203 (3), 186 (2), 174 (2), 171 (2), 160 (2),
159 (15) [M – CO2CH3], 158 (7), 157 (81) [M – CH3SCH2], 145 (3), 144 (40),
143 (21) [M – (CH2)2SCH3], 128 (5), 115 (2), 113 (4), 112 (61), 111 (60) [M –
CO2CH3 – CH3SH], 104 (3), 100 (2), 99 (10), 98 (3), 97 (23), 87 (3), 85 (9),
84 (36), 83 (5), 75 (2), 74 (2), 73 (4), 72 (6), 71 (6), 70 (5), 69 (2), 68 (4), 63
(2), 62 (2), 61 (43) [CH3SCH2], 59 (3), 58 (4), 57 (18), 56 (5), 55 (3), 54 (4),
47 (3), 46 (9), 45 (11), 44 (100) [NMe2], 43 (4), 42 (36), 41 (11),
40 (2), 39 (3)
Histidine
–
(155→224)
Phenylalanine
(165→234)
1692±2/1732±2
Phe-N-DMAM-Me: 235 (4), 234 (27) [M], 176 (3), 175 (20) [M – CO2CH3],
162 (11), 161 (100) [M – PhCH2], 134 (8), 132 (2), 131 (3), 121 (12), 120
(15), 119 (4), 118 (3), 117 (3), 105 (3), 104 (12), 103 (11), 102 (3), 99 (29), 92
(2), 91 (36), 90 (4), 89 (4), 80 (9), 79 (2), 78 (6), 77 (12), 76 (2), 73 (3), 72
(22), 51 (5), 46 (4), 45 (6), 44 (90) [NMe2], 43 (4), 42 (27), 41 (2), 39 (2)
Arg-bis-N-DMAM-Me: 298 [M], 250 (1), 248 (1), 212 (5), 211 (2), 197 (2),
187 (2), 186 (13), 185 (4), 184 (32), 168 (2), 157 (6), 153 (2), 152 (5), 168 (2),
157 (6), 153 (2), 152 (5), 151 (4), 143 (6), 142 (7), 141 (8), 140 (4), 129 (3),
128 (28), 126 (6), 125 (28), 124 (6), 114 (3), 113 (3), 111 (5), 109 (3), 101 (3),
100 (36), 99 (46), 98 (63), 97 (17), 96 (6), 85 (22), 84 (6), 83 (11), 82 (7), 81
(2), 80 (6), 75 (2), 73 (23), 72 (41), 71 (27) [(Me2NCHN], 70 (13), 69 (3), 68
(8), 67 (2), 59 (3), 58 (6), 57 (15), 56 (8), 55 (6), 54 (4), 53 (2), 46 (21), 45
(12), 44 (100) [NMe2], 43 (22), 42 (37), 41 (9), 40 (8)
Arginine
(174→298)
1842±2/1909±2
Tyrosine
(181→250)
–/1987±4
Tyr-N-DMAM-Me: 250 [M], 191 (9) [M – CO2CH3], 144 (6), 143 (53)
[Me2NCHNCHCO2CH3], 107 (2), 96 (6), 91 (4), 84 (3), 83 (7), 79 (2), 72 (7),
71 (2), 68 (2), 58 (2), 57 (10), 56 (3), 53 (3), 46 (6), 45 (4), 44 (100) [NMe2],
43 (3), 42 (22), 41 (3), 39 (3)
1994±2/2038±5
Tyr-N-DMAM-Me2: 264 [M], 205 (5) [M – CO2CH3], 144 (8), 143 (72)
[Me2NCHNCHCO2CH3], 133 (2), 122 (2), 121 (9), 103 (11), 100 (2), 91 (2), 84
(2), 79 (2), 78 (6), 77 (4), 76 (2), 74 (2), 73 (5), 72 (5), 71 (6), 64 (2), 57 (11),
56 (2), 53 (2), 51 (2), 46 (9), 45 (7), 44 (100) [NMe2], 42 (21), 41 (3), 40 (2)
RUSSIAN JOURNAL OF GENERAL CHEMISTRY Vol. 85 No. 8 2015