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[Microflora in pasteurized fruit juices in Venezuela]
Abstract:
A total of 96 pasteurized fruit juice samples obtained at retail level and packed in pure-pak containers were analyzed, to determine their pH and mould yeasts counts. The isolated microflora were identified by macroscopic and microscopic techniques besides biochemical reactions. The pH rate values were the following: cocktail fruit, pH 2.3-4.3; orange, pH 2.8-3.7; passion fruit, pH 2.3-3.7; and tamarind, pH 2.5-3.7. The yeast and mould counts per ml were: cocktail fruit, 0-8.0 x 10(3), orange, 1.0 x 10(2)-4.5 x 10(3); passion fruit, 0-7.7 x 10(3), and tamarind, 0-6.0 x 10(2). The predominance of yeasts over the fungi in almost all the juices is evident; the only exception was tamarind juice. The genera of the yeasts commonly isolated were: Candida, Rhodotorula, Saccharomyces and Pichia, and among the fungi: Aspergillus, Penicillium and Cladosporium. Yeasts are probably the main cause of spoilage in these pasteurized fruit juices.
Insights
This study analyzed 96 pasteurized fruit juices, finding yeasts predominated microbial spoilage, except in tamarind juice. The research identified common yeast and mold genera, highlighting yeasts as the primary cause of spoilage in these products.
Area of Science:
- Food Microbiology
- Microbial Spoilage Analysis
- Fruit Juice Quality Assessment
Context:
- Pasteurized fruit juices are widely consumed, making their microbial safety and shelf-life crucial.
- Retail-level analysis provides insights into the microbiological quality of commercially available products.
- Understanding microbial contamination in fruit juices is essential for public health and industry standards.
Purpose:
- To determine the pH and yeast and mold counts in 96 pasteurized fruit juice samples.
- To identify the microflora present in these fruit juices using various microbiological techniques.
- To assess the primary microbial agents responsible for spoilage in pasteurized fruit juices.
Summary:
- Ninety-six pasteurized fruit juice samples (cocktail, orange, passion fruit, tamarind) were analyzed for pH and microbial counts.
- pH values ranged from 2.3 to 4.3, with yeast and mold counts varying significantly across juice types.
- Commonly isolated yeasts included Candida, Rhodotorula, Saccharomyces, and Pichia, while fungi included Aspergillus, Penicillium, and Cladosporium.
- Yeasts were the predominant microflora in most juices, with tamarind juice being an exception.
- The study suggests yeasts are the main cause of spoilage in these pasteurized fruit juices.
Impact:
- Provides critical data on the microbiological quality of pasteurized fruit juices available to consumers.
- Informs food safety protocols and quality control measures for fruit juice production.
- Highlights the role of specific yeast genera in the spoilage of fruit-based beverages.