In article <whc-3103961518330001 at macr3-20.welc.cam.ac.uk>,
whc at mole.bio.cam.ac.uk says...
>>Does anyone have a reliable method for measuring the concentration of
>short peptides (say 10-30 aa long). The standard Bradford assay to does
>not work on such shorties.
>University of Cambridge
>Cambridge CB2 3EG
One fairly reliable way is amino acid analysis. A protocol along these lines
Use an accuratly determined aliquot of the peptide. Either weighed or
pipetted from a specified stock solution.
Post hydrolysis dissolution of the sample should be with an accuratly
measured aliquot of the analysis buffer and standard solution.
The concentrations of the amino acid constituents is reported. So clearly
from the amount of the hydrolysis stable amino acid- ile, leu, val and the
like- an accurate peptide content can be found.
I hope this helps.