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9. Incidence of fungal contamination in fresh ginseng samples and mycotoxigenic potential of representative fungal isolates.

Author

Choi, Jang Nam, Kim, So Soo, Baek, Ji Seon, Park, Jin Ju, Choi, Jung Hye, Lee, Mi Jeong, Jang, Ja Yeong, Kim, Jeom Soon, and Lee, Theresa

Subjects
APPLE blue mold, FUSARIUM solani, BEAUVERICIN, FUSARIUM oxysporum, GINSENG, PENICILLIUM, ASPERGILLUS
Abstract

BACKGROUND: Fresh ginseng is typically accompanied by soil after harvest, leading to contamination with harmful fungi during storage and distribution. In this study, we investigated the incidence of fungal contamination in fresh ginseng (5–6 years old) purchased from 22 different stores in Geumsan, Korea. RESULTS: The incidence of fungal contamination in the samples was 67.4–111.5%. Fusarium solani was the most abundant species in the head (38.5%) and fine root (19.3%) parts of the ginseng samples, whereas F. oxysporum was the most abundant in the main root (22.0%) part. We isolated Aspergillus, Fusarium and Penicillium spp. (total number of isolates: 395) from the ginseng samples, and 138 isolates were identified using phylogenetic analysis. Polymerase chain reaction‐based screening of 65 mycotoxin‐producing species revealed that two P. expansum isolates were positive for citrinin and/or patulin, and five F. oxysporum isolates were positive for fumonisin biosynthesis gene. One P. expansum isolate produced 738.0 mg kg−1 patulin, and the other produced 10.4 mg kg−1 citrinin and 12.0 mg kg−1 patulin on potato dextrose agar (PDA) medium. Among the 47 representative F. oxysporum isolates, 43 (91.5%) produced beauvericin (0.1–15.4 mg kg−1) and four of them (8.5%) produced enniatin B and enniatin B1 (0.1–1.8 mg kg−1) as well. However, none of these toxins was detected in fresh ginseng samples. CONCLUSION: Fusarium solani and F. oxysporum were the most abundant species in fresh ginseng samples. Most F. oxysporum (43) and P. expansum (2) strains isolated from fresh ginseng produced beauvericin and enniatins (B and B1), and patulin or citrinin, respectively, on PDA medium. This is the first report of the mycotoxigenic potential of P. expansum and F. oxysporum strains isolated from fresh ginseng. © 2024 Society of Chemical Industry. [ABSTRACT FROM AUTHOR]

Published
2024
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14. Antibiotic Resistance in Acetic Acid Bacteria Originating from Vinegar.

Author

Kim, Sun-Hee, Jang, Hyun-Wook, Park, Jin-Ju, Nam, Dong-Geon, Lee, Su-Jeong, Yeo, Soo-Hwan, and Kim, So-Young

Subjects
ACETOBACTER, DRUG resistance in bacteria, GENOMICS, EFFLUX (Microbiology), FOOD safety, ERYTHROMYCIN
Abstract

Acetic acid bacteria (AAB) are major contributors to the production of fermented vinegar, offering various cultural, culinary, and health benefits. Although the residual unpasteurized AAB after vinegar production are not pathogens, these are necessary and require safety evaluations, including antibiotic resistance, before use as a starter. In this research, we investigated the antibiotic resistance profiles of 26 AAB strains, including various species of Komagataeibacter and Acetobacter, against 10 different antibiotics using the E-test method. All strains exhibited resistance to aztreonam and clindamycin. Komagataeibacter species demonstrated a 50% resistance rate to ciprofloxacin, analogous to Acetobacter species, but showed twice the resistance rates to chloramphenicol and erythromycin. Genomic analysis of K. saccharivorans CV1 identified intrinsic resistance mechanisms, such as multidrug efflux pumps, thereby enhancing our understanding of antibiotic resistance in acetic acid-producing bacteria. These findings enhance understanding of antibiotic resistance in AAB for food safety and new antimicrobial strategies, suggesting the need for standardized testing methods and molecular genetic study. [ABSTRACT FROM AUTHOR]

Published
2024
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