Abstract
The physiology of noni (Morinda citrifolia) fruit ripening, as well as the chemical and microbial properties of its fermented juice, were determined. The ripening fruit had a nonclimacteric respiratory pattern (34 mg CO2·kg−1h−1) and no detectable ethylene production. The fungus, Mucor circinelloides, was consistently isolated from fermented juice, with peak populations at 14 d coincident with an increase in headspace CO2 and a decline in pH and soluble solids. Bacterial populations were greatest at 42 d, with Erwinia pyrifoliae and Gluconobacter frateurii isolated from fermented juice. Sugar concentration (64.8 mg·mL−1) decreased by 37% after 7 d, while organic acids (26.6 mg·mL−1) were the highest at 28 d. Major non-volatile acids present in the fermented juice included acetic, ascorbic, dehydroascorbic, galacturonic, malonic, succinic, and tartaric acids.