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Yeasts Associated with Fruit Juice Concentrates.
1Center for Food Safety and Quality Enhancement Department of Food Science and Technology, University of Georgia, Griffin, Georgia 30223-1797.
Journal of Food Protection
|May 23, 2019
Summary
This study identified yeast populations in frozen fruit juice concentrates, finding Saccharomyces cerevisiae, Candida stellata, and Zygosaccharomyces rouxii as the most common species. These yeasts are prevalent across various fruit juice types.
Area of Science:
- Food microbiology
- Mycology
- Food safety
Background:
- Yeasts are common contaminants in food products, including fruit juice concentrates.
- Understanding yeast populations is crucial for maintaining product quality and safety.
Purpose of the Study:
- To determine the populations and frequency of occurrence of yeasts in frozen apple, cherry, grape, orange, and pineapple juice concentrates.
- To identify the predominant yeast species in these concentrates.
Main Methods:
- Collected 33 samples of frozen fruit juice concentrates.
- Diluted samples (1:4) and incubated at 25°C for 24 hours.
- Isolated and identified yeasts using standard microbiological techniques.
Main Results:
- Total yeast populations ranged from <1.00 to 5.41 CFU/ml, increasing to 2.42-7.34 CFU/ml after incubation.
- 154 isolates represented 21 species and 12 genera.
- Saccharomyces cerevisiae (24.7%), Candida stellata (22.1%), and Zygosaccharomyces rouxii (14.3%) were the most frequent species.
- C. stellata was observed at a high frequency, potentially for the first time in juice concentrates.
Conclusions:
- Frozen fruit juice concentrates harbor diverse yeast populations.
- Saccharomyces cerevisiae, Candida stellata, and Zygosaccharomyces rouxii are key species to monitor in these products.
- The high prevalence of C. stellata warrants further investigation.
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