Ascorbic acid and tannins from Emblica officinalis Gaertn. Fruits--a revisit

J Agric Food Chem. 2009 Jan 14;57(1):220-5. doi: 10.1021/jf802900b.

Abstract

The fruits of Emblica officinalis Gaertn. (Euphorbiaceae), also known as amla in Ayurveda, are considered to be a rich source of ascorbic acid. However, the antioxidant activities exhibited by E. officinalis extract are superior to those of ascorbic acid itself. Low molecular hydrolyzable tannins emblicanins A and B have been suggested in the earlier literature to be the contributory antioxidant molecules in the extract. This work finds no evidence for the presence of emblicanins A and B in the extract. In addition, the high content of ascorbic acid is also questionable due to previous nonidentification of coeluting mucic acid gallates. This paper reports a new HPLC method to detect even trace amounts of ascorbic acid in E. officinalis fruit juice or extract.

MeSH terms

  • Ascorbic Acid / analysis*
  • Chromatography, High Pressure Liquid / methods
  • Fruit / chemistry*
  • Glycosides / analysis
  • Phyllanthus emblica / chemistry*
  • Plant Extracts / chemistry
  • Tannins / analysis*

Substances

  • Glycosides
  • Plant Extracts
  • Tannins
  • emblicanin A
  • emblicanin B
  • Ascorbic Acid