Iqbal Azhar, Farah Mazhar, Qazi Nawab Manzar, Iftekhar Hussain, Sumbul Shamim.
Colorimetric determination of Indolic drugs.
Pak J Pharm Sci Jan ;18(2):48-51.

A colorimetric method has been developed for the quantitative determination of the rescinnamine, reserpine upto (-10-4M), Yohimbine on complexation with bromothymol blue. The coloured complexes exhibit absorption maxima in the region 415-416 nm. The RSD (Relative Standard Deviation) of the method is 2.02%. The method is simple, easy, rapid and convenient for routine analysis of the indolic drugs.

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