title: Characterization of pomegranate juice and whey based novel beverage fermented by kefir grains.
abstract: Mixture of pomegranate juice and whey was evaluated as a potential substrate for production of a novel probiotic beverage by kefir grains. Different fermentation conditions were used as viz: two fermentation temperature (19 ºC and 25 ºC) and two levels of kefir grains inoculum (5 % and 8%w/v). pH, acidity, lactose consumption as well as organic acids formation were determined during 32 hours of fermentation. Results showed that kefir grains were able to utilize lactose and decrease pH, increase acidity, produce lactic acid and acetic acid, while the level of citric acid decreased. It was observed these change depended on temperature and level of kefir grains with the highest changes at the temperature of 25 ºC and kefir grains inoculum of 8%w/v. Pomegranate juice and whey mixture therefore may serve as a suitable substrate for the production of novel probiotic dairy-fruit juice beverage by kefir grains and the sensory characteristics of this beverage were shown desirable results.
authors.affiliation: Department of Food Science and Technology, School of Agriculture, Shiraz University, Shiraz, Islamic Republic of Iran.
authors.forename: Nayereh
authors.initials: N
authors.lastname: Sabokbar
authors.affiliation: Bioprocessing and Biodetection Laboratory, Department of Food Science, Engeneering and Technology, Faculty of Agricultural Engineering and Technology, Campus of Agriculture and Natural Resource, University of Tehran, Karaj, Islamic Republic of Iran.
authors.forename: Faramarz
authors.initials: F
authors.lastname: Khodaiyan
keywords: Fermentation; Kefir; Pomegranate juice; Whey