Five new (VibramicinH)(2)[PtX6] type complex salts of the solutions (doxycy
cline) have been isolated from hydrochloric acid solutions (X = Cl-, Br-, N
O2-, I-, SCN-). Some new gravimetric, oxidimetric and spectrometric methods
were described for the analytical determination of this antibiotic on the
basis of complex salts, insoluble in the water and soluble in acetone. Resu
lts were statistically interpreted.