Note: Influence of different heating media on thermal resistance of Neosartorya fischeri isolated from papaya fruit |
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Authors: | E. Rajashekhara E.R. Suresh S. Ethiraj |
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Affiliation: | Division of Post Harvest Technology, Microbiology Laboratory, Indian Institute of Horticultural Research, Hessaraghatta Lake (Post), Bangalore, India |
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Abstract: | E. RAJASHEKHARA, E.R. SURESH AND S. ETHIRAJ. 1996. A heat-resistant mold identified as a strain of Neosartorya fischeri was isolated from microbiologically spoiled papaya fruits. The optimum heat activation temperature and time for the ascospores of the test mold was found to be 80°C for 15–30 min. The decimal reduction times ( D -values) at 85°, 87° and 89°C in phosphate buffer (pH 7·0) as heating medium were 35·25, 11·1 and 3·90 min respectively and hence the calculated z -value was 4·0°C. In grape and mango juices as heating media, the D 80°C and the D 85°C values were increased as the °Brix level raised from 10 to 45. In commercial fruit juices of mango, orange, pineapple and mango-pineapple blend as heating media D 85°C values were greater than those observed for phosphate buffer. |
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