Welcome to the New Restek.com! Take a tour of the new site and feel free to send us your feedback.

Your web browser will no longer be supported by Restek.com as of 30 June 2021.
To avoid any interruption in access or functionality, install a current-generation web browser now. Learn more.

Mesylate, Besylate, and Tosylate Genotoxic Impurities on Rxi-624Sil MS (extracted ion chromatograms)

PeakstR (min)Ions Monitored (m/z)
1.Methyl methanesulfonate (MMS)5.04379, 80, 95
2.Isopropyl methanesulfonate (iPMS)6.01059, 79, 123
3.Diethyl sulfate (DES)6.357111, 125, 139
4.di-isopropyl sulfate (DPS)6.97045, 87, 167
5.dibutyl sulfate (DBS)9.26029, 41, 56
6.Methyl benzenesulfonate (MBS)9.46377, 141, 172
PeakstR (min)Ions Monitored (m/z)
7.Ethyl benzenesulfonate (EBS)9.88377, 141, 186
8.Methyl toluenesulfonate (MTS)10.33791, 155, 186
9.Ethyl toluenesulfonate (ETS)10.71391, 155, 200
10.n-propyl toluenesulfonate (nPTS)10.82791, 155, 172
11.n-butyl benzenesulfonate (nBBS)11.0777, 141, 159
12.isopropyl p-toluenesulfonate (iPTS)11.24091, 155, 172
13.p-toluenesulfonic acid n-butyl ester (nBTS)11.82391, 155, 173
* ortho isomer of ETS
ColumnRxi-624Sil MS, 20 m, 0.18 mm ID, 1.00 µm (cat.# 13865)
Diluent:90:10 acetonitrile:water
Conc.:500 ng/mL
Inj. Vol.:1 µL splitless (hold 0.5 min)
Liner:3.5mm Single Gooseneck Liner with wool placed 3cm from top (middle) (cat.# 22286)
Inj. Temp.:220 °C
Purge Flow:3 mL/min
Oven Temp.:80 °C (hold 2 min) to 300 °C at 20 °C/min (hold 5 min)
Carrier GasHe, constant flow
Linear Velocity:45 cm/sec
Transfer Line Temp.:280 °C
Analyzer Type:Quadrupole
Source Temp.:280 °C
Solvent Delay Time:4 min
Ionization Mode:EI
InstrumentShimadzu 2010 GC & QP2010+ MS
AcknowledgementIn collaboration with Merck and Company