K 1510 (OTTO) Ketoprofen, ≥98% Cas 22071-15-4 used as sample to analyse the effects of long storage period by chromatographic and microscopic techniques.K 1510 (OTTO) Ketoprofen, ≥98% Cas 22071-15-4 used in phosphate buffer to study its ability to inhibit heat-induced denaturation of albumin.