Barbhaiya R H, Turner P
Br J Clin Pharmacol. 1977 Aug;4(4):427-31. doi: 10.1111/j.1365-2125.1977.tb00757.x.
1 A simple, rapid and reproducible fluorimetric assay for cephradine, cephalexin and cephaloglycin is described. 2 The method involves addition of formaldehyde which catalyses the formation of fluorescent derivatives. 3 The structural similarities between the side chains of these antibiotics and their identical excitation and emission spectra suggest that they may be forming similar fluorescent derivatives.