Microbial diversities and potential hazards of Korean turbid rice wines (makgeolli): Multivariate analyses

Nam Hee Kim, Se Hui Jun, Soon Ho Lee, In Gyun Hwang, Min-Suk Rhee

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A number of makgeolli (Korean traditional turbid rice wine) products are commercially available in various forms. To date, there has been no comprehensive investigation of these products. Here, we collected samples of almost all of the makgeolli products that are currently commercially available (n = 167), recorded their manufacturing variables, and examined physiochemical parameters and microbial communities, using quantitative and qualitative methods. The aerobic plate count (APC) and counts of lactic acid bacteria (LAB), acetic acid bacteria (AAB), fungi, total coliforms, and Bacillus cereus were obtained, and the presence of Escherichia coli and eight foodborne pathogens was also examined. The data obtained were segmented and analyzed based on multiple variables associated with the manufacturing characteristics. Despite high ethanol contents (up to 16.0%) and high acidities (pH 3.3–4.5), the rice wine products examined here had diverse and abundant microbiotas (mean values: APC, 5.3; LAB,4.4; AAB,1.5; fungi, 3.8 log CFU/ml). In particular, LAB and fungi, which are used as co-starter cultures during rice wine manufacturing, accounted for the majority of the microbiotas. Bivariate analyses revealed significant positive correlations between the individual micro-organism counts (Pearson correlation coefficient = 0.668–0.947). Among the manufacturing variables considered in this study, only the pasteurization status had a significant effect on the microbial communities of rice wine products (p < 0.05). When examining the presence of foodborne pathogens, B. cereus was isolated from some of the rice wine products (58.1%) at low levels (<100 CFU/ml), and its detection rate was not significantly lower in the pasteurized products than the raw products. Overall, the results presented here provide a comprehensive overview of the microbiotas of commercially available turbid rice wines and their relationships to manufacturing variables. These data will help to direct future studies focusing on rice wine quality and safety control measures.

Original languageEnglish
Pages (from-to)466-472
Number of pages7
JournalFood Microbiology
Volume76
DOIs
Publication statusPublished - 2018 Dec 1

Fingerprint

rice wines
Wine
Multivariate Analysis
manufacturing
Microbiota
Bacteria
acetic acid bacteria
lactic acid bacteria
Lactic Acid
Fungi
Bacillus cereus
food pathogens
Acetic Acid
plate count
fungi
microbial communities
Pasteurization
wine quality
Enterobacteriaceae
starter cultures

Keywords

  • Bacillus cereus
  • Correlation
  • Makgeolli
  • Microbial community
  • Pasteurization
  • Turbid rice wine

ASJC Scopus subject areas

  • Food Science
  • Microbiology

Cite this

Microbial diversities and potential hazards of Korean turbid rice wines (makgeolli) : Multivariate analyses. / Kim, Nam Hee; Jun, Se Hui; Lee, Soon Ho; Hwang, In Gyun; Rhee, Min-Suk.

In: Food Microbiology, Vol. 76, 01.12.2018, p. 466-472.

Research output: Contribution to journalArticle

Kim, Nam Hee ; Jun, Se Hui ; Lee, Soon Ho ; Hwang, In Gyun ; Rhee, Min-Suk. / Microbial diversities and potential hazards of Korean turbid rice wines (makgeolli) : Multivariate analyses. In: Food Microbiology. 2018 ; Vol. 76. pp. 466-472.
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