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The Effects of Sugar Content on Growth of Zygosaccharomyces bailii in Rice-syrup  

Lee, Hee-Seok (Department of Food Science and Technology, Chung-Ang University)
Choi, Jin-Won (Department of Food Science and Technology, Chung-Ang University)
Song, Hyuk-Hwan (Department of Food Science and Technology, Chung-Ang University)
Ha, Sang-Do (Department of Food Science and Technology, Chung-Ang University)
Park, Sung-Yong (OTTOGI Research Center)
Lee, Yong-Gab (OTTOGI Research Center)
Lee, Chan (Department of Food Science and Technology, Chung-Ang University)
Publication Information
Korean Journal of Food Science and Technology / v.37, no.6, 2005 , pp. 957-961 More about this Journal
Abstract
Spoilage yeast was isolated from spoiled rice-syrup and identified by Microbial Identification system (MIDI) as Zygosaccharomyces bailii based on composition of fatty acids exhibiting carbon skeleton of 16:0, 16.1 $({\Delta}cis\;7)$, 18:2 $({\Delta}cis\;9)$, 18:1 $({\Delta}cis\;9)$, and 18:1. Increase in sugar content $(1^{\circ}brix)$ resulted in decreased moisture concentration (1%), and water activity decreased from 0.72 to 0,63 when sugar concentration increased from 77 to $83^{\circ}brix$. Yeast showed very slow growth during three weeks post-inoculation in rice-syrup at 17 and $79^{\circ}brix$, and maximal level of Z. bailii was found at 6 and 10 weeks storage at 15 and $25^{\circ}C$, respectively. At over $81^{\circ}brix$ its growth slowly decreased at beginning of storage, indicating rice-syrup could be preserved safely at above $81^{\circ}brix$ sugar content without Z. bailii contamination.
Keywords
rice-syrup; Zygosaccharomyces bailii; sugar content; water activity;
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