[Biological and physicochemical properties of the alpha- and beta-forms of cephaloridine]

Alfa- and delta forms of cephalosporin were compared. Biological activity, lantimicrobial spectrum and innocuousness of the forms and their physico-chemical properties were investigated with the methods of infrared and ultraviolet spectrophotometry and derivatography. No significant differences in the biological properties of alfa- and delta forms of cephalosporin were found. However, the ingrared spectrum of the delta-form was indicative of higher stability of its molecule, which was confirmed by higher thermostability of delta-cephalosporin.