Yeasts that cannot ferment sugar do not become more resistant to sorbic acid in low-sugar environments, indicating that the ability to switch to fermentation is required for this resistance.
Evidence from Studies
No evidence studies found yet.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
Whether fermentative capacity is a consistent predictor of sorbic acid resistance in low-sugar food environments across fungal species.
A systematic review and meta-analysis of all published studies comparing sorbic acid MIC in fermentation-positive versus fermentation-negative yeast species under low-glucose conditions, including at least 30 species with standardized metabolic classification and MIC protocols.
Whether engineering fermentation capability into a non-fermentative yeast confers sorbic acid resistance under low glucose.
A double-blind RCT comparing sorbic acid resistance in a fermentation-negative yeast (e.g., Rhodotorula glutinis) engineered to express S. cerevisiae fermentation genes (PDC1, ADH1) versus unmodified controls, under low-glucose (0.1%) conditions with sorbic acid (200 mg/L), measuring growth over 72 hours.
Whether spoilage events in low-sugar beverages are more common in fermentation-positive than fermentation-negative yeast species.
A prospective cohort study tracking 500 low-sugar beverages for 12 months, identifying spoilage-causing yeast species and classifying them as fermentation-positive or -negative based on metabolic assays, with spoilage incidence as the primary outcome.
Whether yeast isolates from spoiled low-sugar beverages are more likely to be fermentation-positive than isolates from non-spoiled ones.
A case-control study comparing 40 yeast isolates from spoiled low-sugar beverages (cases) with 40 isolates from non-spoiled counterparts (controls), testing for fermentation capability via CO2 production under anaerobic conditions.
The proportion of fermentation-positive yeasts among isolates from commercial low-sugar beverages.
A cross-sectional survey of 150 yeast isolates from retail low-sugar beverages, classifying each as fermentation-positive or -negative via anaerobic CO2 production and correlating with preservative resistance (MIC).