J Food Prot
Department of Food Science, Cornell University, Ithaca, New York 14853, USA.
Published: February 2022
Abstract: Black yeasts can survive extreme conditions in food production because of their polyextremotolerant character. However, significant strain-to-strain variation in black yeast thermoresistance has been observed. In this study, we assessed the variability in tolerance to nonthermal interventions among a collection of food-related black yeast strains. Variation in tolerance to UV light treatment, high pressure processing (HPP), sanitizers, and osmotic pressure was observed within each species. The two strains previously shown to possess high thermotolerance, Exophiala phaeomuriformis FSL-E2-0572 and Exophiala dermatitidis YB-734, were also the most HPP tolerant but were the least halotolerant. Meanwhile, Aureobasidium pullulans FSL-E2-0290 was the most UV and sanitizer tolerant but had been shown to have relatively low thermoresistance. Fisher's exact tests showed that thermoresistance in black yeasts was associated with HPP tolerance and inversely with halotolerance, but no association was found with UV tolerance or sanitizer tolerance. Collectively, the relative stress tolerance among strains varied across interventions. Given this variation, different food products are susceptible to black yeast spoilage. In addition, different strains should be selected in challenge studies specific to the intervention.
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http://dx.doi.org/10.4315/JFP-21-314 | DOI Listing |
Environ Sci Pollut Res Int
January 2025
Department of Textile Chemistry, Bandung Polytechnic of Textile Technology, Bandung, West Java, 40272, Indonesia.
Kombucha is a popular fermented beverage that involves fermentation using a symbiotic culture of bacteria and yeast (SCOBY) and produces bacterial cellulose (BC). Carbon and nitrogen sources are essential in kombucha processing and BC production. However, studies on cost-effective BC production as an alternative source of leather have remained scarce.
View Article and Find Full Text PDFSci Rep
January 2025
Department of Biology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia.
Aureobasidium melanogenum is a black yeast-like fungus that occurs frequently both in nature and in domestic environments. It is becoming increasingly important as an opportunistic pathogen. Nevertheless, its effect on human cells has not yet been studied.
View Article and Find Full Text PDFAntioxidants (Basel)
December 2024
University of Zagreb, Faculty of Food Technology and Biotechnology, Pierottijeva 6, 10000 Zagreb, Croatia.
To determine the optimal conditions of pressurized liquid extraction (PLE) and microwave-assisted extraction (MAE) of polyphenols from black chokeberry leaves (BCL), temperature, time and sample-to-solvent ratio (SSR) were varied to obtain maximum polyphenols yield. The extracts were analyzed for total polyphenols (TP) as well as individual ones (UPLC ESI MS) and antioxidant capacity (FRAP, DPPH and ORAC). Moreover, the biological activity of the selected extracts was additionally determined.
View Article and Find Full Text PDFJ Nutr
December 2024
Bioactive Compounds and Carbohydrates (BIOCARB) Research Group, Department of Food Science and Technology, Universidade Federal de Viçosa, Viçosa, MG, Brazil. Electronic address:
Background: Kombucha, a fermented beverage obtained from a Symbiotic Culture of Bacteria and Yeast, has shown potential in modulating gut microbiota, although no clinical trials have been done.
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Methods: A pre-post clinical intervention study was conducted lasting 8 wk.
IUBMB Life
January 2025
Senckenberg Biodiversity and Climate Research Centre (S-BiKF), Senckenberg Gesellschaft für Naturforschung, Frankfurt am Main, Germany.
Lichens are mutualistic associations consisting of a primary fungal host, and one to few primary phototrophic symbiont(s), usually a green alga and/or a cyanobacterium. They form complex thallus structures, which provide unique and stable habitats for many other microorganisms. Frequently isolated from lichens are the so-called black fungi, or black yeasts, which are mainly characterized by melanized cell walls and extremophilic lifestyles.
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