Yeasts Associated with Fruit Juice Concentrates

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Abstract
Populations and frequency of occurrence of yeasts in frozen apple, cherry, grape, orange, and pineapple juice concentrates were determined. Total yeast populations ranged from log10 < 1.00 to 5.41 CFU/ml of diluted (1:4) concentrate and increased to 2.42–7.34 CFU/ml after 24 h of incubation at 25°C. One hundred fifty-four isolates from 33 samples of fruit juice concentrates represented 21 species and 12 genera. The most frequently isolated species were Saccharomyces cerevisiae (24.7% of isolates), Candida stellata (22.1%), and Zygosaccharomyces rouxii (14.3%), followed by, in decreasing order of frequency, Torulaspora delbrueckii, Rhodotorula mucilaginosa, Issatchenkia orientalis, Hanseniaspora occidentalis, Lodderomyces elongisporus, Kluyveromyces thermotolerans, Hanseniaspora guilliermondii, Candida glabrata, and Pichia anomala, each representing 3–8% of isolates. Candida magnoliae, Candida maltosa, Candida parapsilosis, Candida tropicalis, Clavispora lusitaniae, Cryptococcus humicolus, C. laurentii, Pi...

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