• Chemical composition ofCalotropis gigantea - Part II. Wax and resin components of the stem bark

    • Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/seca/021/01/0008-0018

    • Keywords

       

      Triterpene; Stem Bark; Unsaponifiable Matter; Mixed Melting Point; Triterpene Alcohol

    • Abstract

       

      A study of the wax and resin components of the stem bark ofCalotropis gigantea is described. They were separated into fractions by means of alcohol. The most sparingly soluble fraction consisted of esters of resinols with long chain (saturated and unsaturated) fatty acids. From the unsaponifiable matter by fractionating the acetates and the benzoates, α-and β-calotropeols and β-amyrin were obtained. Small quantities of a mixture of possibly tetracyclic triterpene compounds and traces of sterols were also found to be present. A subsequent fraction was aliphatic being made up of 90% of fatty acids (C30 and near homologues) and 10% of hydrocarbons (C31+C33, etc). The most soluble fraction contained esters of triterpene alcohols with steam volatile fatty acids. By a process of direct crystallisation applied repeatedly a new substance, Giganteol acetate, could be obtained from this fraction. It yielded a new dihydric alcohol, Giganteol, having the formula C30H50O2.

      An alcoholic extract of the wax-free stem bark yielded mineral matter consisting of citrates, chlorides and tartrates of sodium and potassium.

    • Author Affiliations

       

      P Bhaskara Rama Murti1 T R Seshadri1

      1. Departments of Chemistry and Chemical Technology, Andhra University, India
    • Dates

       
  •  

© 2021-2022 Indian Academy of Sciences, Bengaluru.