Total Antioxidant Capacity of Noni (Morinda citrifolia) Products as Affected by Processing and Storage

The Worldnutra, 2004 Conference. Poster Session #30
Total Antioxidant Capacity of Noni (Morinda citrifolia) Products as Affected by Processing and Storage
Yang, J., Paulino, R.J., Janke-Stedronsky, S.

Tropical noni (Morinda citrifolia L) fruits are commercially processed into juice and powders for disease prevention and therapies. The total antioxidant capacity (TAC) of fresh squeezed noni juice is equivalent to 127 mg ascorbic acid (vitamin C)/100 ml assayed by scavenging the free radical 1,1 -diphenyl-2-picrylhydrazy. Two month traditional fermentation decreased the TAC of noni juice by 70%. Noni juice stored at 24°C for 2 months reduced TAC by 80%. Fresh noni juice stored at -18°C for 2 months exhibited no significant changes of TAC. The TAC of Noni powders dehydrated by hot air or freeze drying was reduced by 45% and 20%, respectively.