Total phenolic content and In vitro antioxidant activity of four indigenous Citrus fruits of North East India

The interest has increased in the consumption of Citrus fruits, it is not only due to their sweet refreshing properties but also because of their other important properties like medicinal, antioxidant and nutritional values . Four different indigenous varieties of Citrus namely Citrus grandis var Robab, Citrus grandis var Khaloi, Citrus sinensis var Valencia, and Citrus sinensis var Sohniangriang have been collected from native places of Assam and Meghalaya of North East India. Direct juices have been extracted from ripen citrus fruits for different biochemical estimations. Total phenolic content and antioxidant scavenging activity have been found to be in very good and significant amount. For scavenging activity of the juices different concentrations of juices were taken and the scavenging activity was found to be increasing in significant amount with increase in the juice concentration. Total acidity (in terms of citric acid content) and pH were also determined.