MS
RLNiece@aol.com
Wed, 7 Oct 1998 11:54:08 EDT
We are looking for calibration standards for masses up to about 1000 on the
LCT (ESI-TOF). Our idea is to use a set of amino acid polymers; they should
be stable and singly charged. A series of phenylalanine homopolymers up to
about 6-mers, perhaps with C-terminal amide appears attractive. The same
series with a C-terminal (for synthesis reasons) glycine or alanine would make
a companion set for cases where the mass of interest overlaps the calibrants.
Homopolymer series I find in catalogues are too big. Does someone know where
to get this kind of mixture in small amounts or are there suggestions for a
better set of standards for calibration?