Acacia suma Seed Oil-Characterization of a HBr-Reactive Acid

✍ Scribed by Ansari, M. H. ;Ahmad, M.

• Publisher: John Wiley and Sons
• Year: 1986
• Weight: 218 KB
• Volume: 88
• Category: Article
• ISSN: 0931-5985
• DOI: 10.1002/lipi.19860881008

✦ Synopsis

The seed oil of Acacia s u m (Leguminosae) was found to have a HBr-reactive fatty acid along with other usual fatty acids. On the basis of chemical, spectroscopic and chromatographic techniques the HBr-reactive acid was identified as ci-9,lO-epoxy-cis-12-octadecenoic (coronaric) acid. This acid makes up 10.6 O/n of the total oil triglycerides.

Seed oils rich in epoxy acids have attracted the attention of lipid chemists due to their versatile uses as stabilizers for plastic formulation and as starting material for the preparation of long-chain compounds ' . Epoxy compounds have also showed carcinogenic activity '.,In continuation of our earlier work on a number of Acacia seed oils containing coronaric acid reported from authors' laboratory 4,5, the present report discloses the presence of coronaric acid in another Acacia oil, Acacia s u m . Durbetaki titration of the oil"' at 3 O C indicated approximately 10.45ofo HBr-reactive acid (Table 2). The oil responded picric acid TLC test '.Negative Halphen test indicated the absence of cyclopropenoid acid. The oil triglycerides and methyl esters (prepared by transesterification) gave no information about conjugation in their ultraviolet (UV) spectra. But, however, they showed moderate absorptions at 848 and 826 cm-' for epoxy function in their infrared (IR) spectra. On the basis of these evidences, the characterization and estimation of the epoxy acid was done using oil FETTE . SEIFEN .