Photometric determination of phenols in essential oils

A photometric procedure is described for determining terpene phenols in essential oils which is based on the formation of colored indophenols with p-quinone chloroimine in an alkaline medium. A comparative evaluation of the results obtained with those of the pharmacopoeial method shows the greater economy, sensitivity, and accuracy of the proposed procedure. Zaporozh'e Medical Institute. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 509–511, July–August, 1988.