Effects of Jiuqu inoculating Rhizopus oryzae Q303 and Saccharomyces cerevisiae on chemical components and microbiota during black glutinous rice wine fermentation.

ABSTRACT

In this study, the physicochemical properties, metabolites, sensory characteristics, and microbiota of black glutinous rice wine (BGRW) during traditional fermentation (TF) and inoculated fermentation (IF) were investigated, and their correlation relationships were revealed. Results indicated that IF promoted total sugar utilization and ethanol and esters synthesis in BGRW. Altogether 67 reliable metabolites were identified, 36 of which were labeled components, primarily esters (OAV > 1). Meanwhile, the concentrations of ethanol, esters, and total flavor on the 11th day of IF were close to those on the 22nd day of TF. Combined with the sensory description indicated that the IF could improve the quality of BGRW. Besides, TF contains vast unfavorable microorganisms, such as Chaetomium, Penicillium, Stachybotrys, and Trichocladium. Therefore, IF can accelerate the fermentation and enhance the flavor of BGRW, and inhibit the growth of pathogenic and spoilage organisms. Finally, Pearson's correlation analysis demonstrated that Saccharomyces, Rhizopus, Lactobacillus, Aspergillus, and Bacillus were the pivotal functional microorganisms in BGRW. The study provided scientific and effective basis for improving the quality, shortening the fermentation cycle, and controlling pathogenic and spoilage organisms of BGRW.