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Zagazig J. Agric. Res.,
Zagazig J. Agric. Res.,
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Abstract: |
Fermented rice milk beverage fortified with cactus pear (Opuntia spp.) and physalis
(Physalis peruviana) fruit pulps were prepared and stored at 5°C for 12 days. The fruit pulps were
added at the rate of 10% and 20% (W/W) of probiotic rice milk. Physico-chemical of fermented rice
milk beverages including total solids, protein, fat, fiber and ash were determined along the storage
period. Acidity, pH, viscosity, microbiological and organoleptic properties were evaluated at zero
time, 4, 8, and 12 days of storage at 5°C. There were significant differences between control and
fermented rice milk beverages enriched with fruit pulps in terms of pH, total solids, protein, fiber, ash,
content and titratable acidity during storage. The results revealed that acidity increased all over the
storage time. The lowest value for viscosity was observed in fermented rice milk beverage containing
20% physalis pulps. A significant increase in both DPPH inhibition (%) and TPC as compared to
control sample, 20%physalis showed significantly higher values for both DPPH inhibition (%) and
TPC. The count of S. thermophilus, L. acidophilus, and Bifidobacterium BB-12 were above 7 log cfu
mL-1 at the end of storage period in all treatments. Sensory evaluation revealed significant differences
between control and fermented rice milk beverage samples. The fermented rice milk beverage
containing 20% cactus pear pulp had the highest overall acceptability score when compared to control
and other treatment samples. The results of the current investigation demonstrated that the addition of
cactus pear and physalis pulps to fermented rice milk beverage significantly improved the quality of
resultant fermented rice milk beverage.
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