the direct determination of 2- ( 2-furoyl ) -4 ( 5 ) - ( 2-furanyl ) -1h-imidazole ( ffi ) , present in the acid hydrolysis products of b-poly ( l-lysine ) and b-albumin and which appears to be a key intermediate in the physicochemical changes occurring during the incubation of protein with glucose , has been carried out by collisional spectroscopy , using a commercial double-focusing , reverse-geometry mass spectrometer and without any sample derivatization and chromatographic separation procedures .
C0001924
albumin
C0033684
protein