Objective: To study the jelly formulation produced by Musa acuminata Colla (AAA
Group) peels and evaluate its antioxidant properties which are related to the product
quality.
Methods: The formulations of peel jelly were established under two-level full factorial
designs within two blocks and one center point. Regarding response optimizer, the
amount of sugar and citric acid was obtained; hence, the peel jellies were produced. The
evaluation of antioxidant properties was conducted by using total phenolic content (TPC)
assay and 1,1 diphenyl-2-picrylhydrazyl (DPPH) free radical assay.
Results: The TPC of peel powder varied from 91.8 to 602.26 mg gallic acid equivalents/
100 g dry weight, and 5%–7% peel jellies had phenolic content ranging from 29.38 to
48.31 mg gallic acid equivalents/100 g dry weight. The results of DPPH test indicated
that at 10 mg/mL, the peel powder showed 89% DPPH inhibition, while 7% peel jelly
prominently exhibited 84% DPPH inhibition. The correlation between DPPH IC50 value
and TPC of peel powder as well as peel jelly was quite reasonably high with correlation
coefficient ranging from 0.843 7 to 0.995.
Conclusions: TPC can be used as an indicator in assessing the antioxidant activity of
fruits and vegetables. The present investigation reveals that TPC is mainly responsible for
DPPH free radical scavenging capacity.