Resveratrol content and antioxidant properties of underutilized fruits.

In the present study, resveratrol content and
antioxidant properties of underutilized fruits such as
Jamun (Syzygium cumini L.), Jackfruit (Artocarpus
heterophyllus) and Mulberry (Morus rubra) were investigated
keeping Grape (Vitis vinifera) as a reference.
Ethanol/water (80:20 v/v) extracts of different parts of fruit
samples including skin, pulp and seeds were analyzed by
HPLC and MS for the quantification of resveratrol. Total
polyphenols, flavonoids, DPPH scavenging activity and
total antioxidant capacity were also investigated. Among
the samples analyzed, mulberry fruit (whole) showed
highest resveratrol content (50.61 μg g−1 dry weight)
followed by jamun seed (34.87 μg g−1 dry weight), jamun
pulp (13.70 μg g−1 dry weight) and skin of jamun
(11.19 μg g−1 dry weight). Jamun seed extract exhibited
the highest polyphenol content (55.54 mg gallic acid
equivalent g−1 dry weight) and highest antioxidant property
(IC50 value-0.40 mg ml−1). The results suggest that
underutilized fruits high in resveratrol and other polyphenols
can be used as functional beverages.