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J. YANG, R. J. Paulino, and S. Janke-Stedronsky. College of Natural and Applied Sciences, Univ. of Guam, UOG Station, Mangilao, 96923, Guam Noni (Morinda Citrifolia) is a tropical plant that traditionally treats various diseases in pacific islands. Novel glycosides isolated from noni fruits exhibit free radical scavenging activity and demonstrate anti-cancer effects. Noni fruits are processed into juice and powders for disease prevention and therapies. Our objective was to determine the effect of processing and storage on the bioavailability of biological components of noni juice and powders. The bioavailability of biological components of noni products was evaluated by the Total Antioxidant Capacity (TAC) assayed by scavenging the free radical 1,1-diphenyl-2-pcrylhydrazyl (DPPH•). The fresh noni juice was prepared by centrifuging noni puree. The fermented noni juice was dripped from noni fruits in sealed pitchers. Noni powders were prepared by dehydration of noni puree with hot air. Noni juice and powders were stored at room temperature, refrigerator, and freezer. The fresh noni juice exhibited the TAC at 130-150 mg equivalent ascorbic acid (EVAA)/100 ml juice. Noni powders possessed the TAC at 700-900 mg EVAA/100g powder. After 3 months storage, the TAC of noni juice decreased to 13% at 30° C, 45% at 4°C, and 93% at -22° C, and the TAC of noni powders decreased to 60% at 30° C, 82% at 4° C, and 80% at -22° C. After 1 week, the inside fermented noni juice lost 70% of the TAC and the outside fermented juice lost 80% of the TAC. After 3 months, the inside and outside fermented noni juice retained only 11% and 7% of the original TAC, respectively. Hot air dehydration of noni puree lost 20% of the TAC at 50° C and 30% of the TAC at 60° C. Temperature negatively affects the bioavailability of bioactive components of noni products during processing and storage. Storage of noni juice in freezer retains much more bioactive components than in refrigerator and at room temperature.
Session 35, Nutraceutical & Functional Foods: General I
2005 IFT Annual Meeting, July 15-20 - New Orleans, Louisiana |