The ABTS assay is commonly applied to determine antioxidant
activity in plants. It is based on the ability of antioxidants to scavenge
the long-life radical cation ABTS+. The antioxidant activity of
the fibre concentrates extracted with methanol:acetone ranged
(p < 0.05) from 5.5 lM TE/g for passion fruit to 38.0 lM TE/g for
mango. The antioxidant activity of ethanol extracts were lower
(p < 0.05) than those of the methanol:acetone extracts, with values
ranging from 1.7 lMTE/g for pineapple to 15.3 lM TE/g for mango,
with no statistically significant differences (p > 0.05) between passion
fruit, pineapple and guava.