TOTAL PHENOLICS, TOTAL TANNINS AND ANTIOXIDANT ACTIVITY OF CASSIA FISTULA L. EXTRACTS OF BARK, STEM, LEAF AND ROOT UNDER DIFFERENT AGE CLASSES

摘要

Indian Laburnum (Cassia fistula L.) bark, stem, leaf and root under different age classes namely Class A (2-3years), Class B (5-10 years) and Class C (10-15 years) were analyzed for their total phenolic content (TPC),total tannin content (TTC) and antioxidant activity (AA). Both total phenolic content (TPC) and total tannincontent (TTC) were determined using Folin-Ciocalteau assays and antioxidant activity (AA) was carried out byFree Radical 2, 2-diphenyl-1-picrylhydrazyl (DPPH) assay. From the study, higher TPC, TTC and AA wereobserved in Cassia fistula bark extracts compare to otherportion extracts (stem, leaf and root). Bark extractsfrom three different age classes, showed total means of 16.67 % TPC and 3.12% TTC. In addition, bark extractsfrom three different age classes also showed high antioxidant activity (AA) with mean IC50 values of 0.04g/ml.