a Photostability studies of pure ellagic acid, ellagic acid (EA) loaded nanosponge fabricated via melt method (EANS1) and ellagic acid loaded nanosponges fabricated via microwave synthesis (EANS3). The data were statistically analyzed by two-way ANOVA followed by Bonferroni posttests. Each value represents (mean ± SD) from triplicate measurements (n = 3). *p < 0.05, **p < 0.01 and *** p < 0.001 represents significant difference between pure drug vs. EANS at same time. b DPPH inhibition activity of ascorbic acid, ellagic acid, (EANS1) ellagic acid loaded nanosponge fabricated via melt method and (EANS3) ellagic acid loaded nanosponges fabricated via microwave synthesis. Each value represents (mean ± SD) from triplicate measurements (n = 3). ***p < 0.0001 indicates a significant difference between pure bioactive vs. EANS at the same concentrations, two-way ANOVA, followed Bonferroni posttests