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Assessment of total phenolic content, anti-oxidant and anti-alphaamylase activities in B.fabellifer, S.pinnata, S.samrangense, C.carandus, A.chaplasha and A.carambolas

Sathi Paul, Dwaipayan Sikdar

To find out a cheap source of dietary phenols and antioxidants along with anti-alpha-amylase activities, ethanol extracts of sixBangladeshi fruitswere investigated. C.carandus had the highest total phenolic content (700.46± 2.26mg/100g), while A.chapalisha (76.27±7.02 mg/100mg) had the lowest phenolic content.All the sample extracts showed increasing reducing ability as the concentration of extracts increased. S.pinnata had the highest and, B.flabellifer and A.Chaplisha had lowest ability to reduce Fe (III), where as the remaining fruits had the intermediate values. All the tested fruits exhibited favorable concentration dependent radical scavenging and antioxidant activities and the IC50 values. S. pinnata [2.11 mg/ml] have the highest IC50 value whereas C.caradus has the lowest value[0.96 ìg/ml] with no significant difference (P<0.05) among them.We examined the correlation between the reciprocal values of IC50 values forDPPHand the amount of total phenolic content found in the extracts of the fruit and obtained a correlation of 0.85. In the present study, á-amylase was strongly inhibited by B.flabellifer, C.carandus. The highest inhibitory activity is found for C. carandus (94.28 ± 0.87%) where as the lowest activity is found for S. samrangense (9.00 ±1.37%).