Analysis of chiral amphetamines using differential mobility separation (DMS)
Many compounds are challenging to analyze because they are isomers (have the same m/z) and also sometimes have the same HPLC retention time. And to make it even more complicated, sometimes there are two chiral forms that have different functions in biology, making it...
Separating cyclosporin isomers using differential mobility separation (DMS)
Cyclosporin A (CsA) has been a very successful immunosuppressant for preventing organ transplant rejection. It is a large cyclic peptide (11 residues, ~1200 Da) and there are numerous modifications of this drug, some of which are isomers. The challenge of analyzing...
Using Bio Tool Kit for interpreting peptide MS/MS data obtained using electron activated dissociation (EAD)
Peptide MS/MS spectra obtained using either collision induced dissociation (CID) or electron activated dissociation (EAD) can be analyzed using the Peptide Fragments pane in Bio Tool Kit in SCIEX OS Software. First, open the EAD MS/MS spectrum that you want to...