Abstract
Potential probiotic yeast strains isolated from fermented food need to meet safe and beneficial conditions for the host’s health. The Pichia kudriavzevii YGM091 strain isolated from fermented goat milk has outstanding probiotic characteristics, including: the high survival percentage in digestive system conditions (reaching up 247.13 ± 0.12 and 145.03 ± 0.06% at pH 3.0 and bile salt 0.5%, respectively); good tolerance to temperature, salt, phenol, ethanol; good surface properties such as high hydrophobicity percentage (> 60%), the high auto-aggregation percentage rate (66.56 ± 1.45% after 45 min of incubation) and the high co-aggregation percentage rate with pathogenic bacteria in a short time (> 40% after 2 h of incubation); biofilm forming after 24 h of incubation on abiotic surfaces; antioxidant activity reached excellent level after only 24 h of incubation (The percentage free radical scavenging and the Trolox equivalent reaching up 79.86 ± 0.70% and 92.09 ± 0.75 µg/mL after 72 h of incubation); extracellular enzymes production protease and cellulase with high activity, amylase and pectinase with moderate activity and non-lipase activity. Simultaneously, the YGM091 strain is the in vitro safety yeast: insensitive to antibiotics and fluconazole, negative for gelatinase, phospholipase, coagulase, and non-hemolysis activities. Furthermore, this strain is in vivo safety yeast with the dosages below 106 CFU/larva in the Galleria mellonella model with over 90% survival larvae and the yeast density reduced to just 102–103 CFU/larva after 72 h post-injection. Research results have demonstrated that the Pichia kudriavzevii YGM091 strain is a safe potential probiotic yeast and could become a candidate probiotic food to be used in the future.
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Acknowledgements
We are grateful to the Tay Nguyen Institute of Scientific Research, the Vietnam Academy of Science and Technology, and the Experiment Center-Practice, Yersin University for supporting this study.
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Kim-Diep Tran: designed the study, and wrote the first and final version of the article. Loan Le-Thi and Hoai-Hieu Vo: designed this part of the experiments, supported the study with microorganism strains and the invertebrate model, and reviewed the different versions of the manuscript. Thanh-Vy Dinh-Thi: designed this part of the experiments, supported the study with microorganism strains and the invertebrate model, and analyzed the data. Tam Nguyen-Thi: supported the study with microorganism strains. Nha-Hoa Phan: supported the study with yeast strains. Khanh-Uyen Nguyen: supported the study with the invertebrate model. All authors performed the experiments, read critically, and approved the manuscript.
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Tran, KD., Le-Thi, L., Vo, HH. et al. Probiotic Properties and Safety Evaluation in the Invertebrate Model Host Galleria mellonella of the Pichia kudriavzevii YGM091 Strain Isolated from Fermented Goat Milk. Probiotics & Antimicro. Prot. (2023). https://doi.org/10.1007/s12602-023-10114-1
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DOI: https://doi.org/10.1007/s12602-023-10114-1