Please note *all* samples for service analysis should be submitted to LSL S503 in the Life Science Laboratories (240 Thatcher Rd).
Use Adobe Reader/Acrobat to fill out the request form electronically as use of most of the web browsers will disable its fillable feature. Fill out submitter and sample information parts completely. Check all suitable solvents from the list and include others into the "other" box. Choose appropriate ionization method (EI, FAB, MALDI, ESI, LC-ESI) and mass measurement accuracy (Low-Res or High-Res). Measurement accuracy expected at Low-Res is about +-0.05 Da for EI, FAB, ESI methods. Mass accuracy at High-Res is better than 5ppm and needed in general for publication purposes.Print out the form and attach your labeled sample at the top-right corner of the form (within "attach your sample here" box).
Please mail or deliver samples to Dr. Eyles or Dr Graichen in the Life Science Laboratories (LSL) Room S503 or S505. LSL is located at 240 Thatcher Road, Amherst MA 01003. Campus maps can be found here.
- Users Service Request Form (this is a fillable PDF form).
- Please download the form and use Adobe Reader to fill it out electronically.
Samples for FAB or EI MS
Samples should be relatively pure, with no salts or buffers present.
Sample quantity requirements: 0.5 - 1 mg dry
Samples for ESI and MALDI MS
Water, methanol, acetonitrile, tetrahydrofuran, propanol, ethanol, toluene, dichloromethane, nitromethane are ESI and MALDI compatible solvents.
Non-volatile solvents (e.g., dimethylformamide (DMF) or dimethyl sulfoxide (DMSO)) are NOT MS friendly. Please avoid using them.
Protein samples for ESI or MALDI MS should be prepared using ultra-pure water (MilliQ 18MΩ cm, or LC-MS grade bottled water). Common buffers (Tris-HCl, HEPES, phosphate buffers) are NOT compatible with MS. They contain non-volatile electrolytes, which cause suppression of ESI/MALDI signal and/or extensive adduct formation. Protein solutions must be buffer exchanged to ESI-friendly solvent systems (e.g., denaturing solvent: 50%:47% water/methanol and 3% acetic acid; up to 100 mM ammonium acetate or ammonium bicarbonate buffers for native proteins or non-covalent complex measurements) prior to mass analysis. Both standard dialysis by diffusion across cellulose tubing/resin-based column and centrifugal ultra-filtration (using centrifugal micro-concentrators) are reliable techniques with regard to MS standards for desalting, concentration, buffer exchange and removal of low molecular weight impurities.