基于定性培养基的非酿酒酵母产酯酶能力分析
A preliminary study on esterase production by non-Saccharomyces yeasts using qualitative screening media
微生物产酯酶能力的高低通过发酵过程直接影响酒类产品中酯类物质的形成,因此产酯微生物的筛选及相关方法的选用对促进酒类品质提升和多元化开发具有重要作用。通过产酯微生物的初筛定性培养基选用、配制和培养条件设置,采用商业酯酶比较2 种定性培养基的表征效果。结果表明:三丁酸甘油酯YPD培养基更适于产酯酶能力表征,最佳条件为采用玻璃培养皿、培养4 h后观察、酯酶浓度为3.75 U·mL-1作为阳性对照。进一步基于该定性培养基评价4 种野生非酿酒酵母(Wickerhamomyces anomalus异常威克汉姆酵母、Issatchenkia terricola土壤伊萨酵母、Schizosaccharomyces japonicus日本裂殖酵母和Hanseniaspora uvarum葡萄汁有孢汉逊酵母)产酯酶能力,共筛选出产酯酶能力较强的2 株异常威克汉姆酵母菌株和1 株日本裂殖酵母菌株,而1株葡萄汁有孢汉逊酵母和1 株土壤伊萨酵母未呈现明显产酯酶能力。菌株生长能力(菌落大小)几乎与透明圈大小呈正相关,这能够为产酯酶能力的定量表征提供辅助检测视角。本研究为产酯微生物的初筛和产酯酶能力评价提供定性培养基筛选方法,所筛选的高产酯酶酵母能够提升酯类物质含量,可为促进酒类多元化开发提供菌种参考。
Microbial esterase production directly affects the formation of ester compounds in alcoholic beverages during fermentation. Therefore, the screening of ester-producing microorganism and the selection of appropriate screening methods are important for improving the quality and promoting the diversified development of alcoholic beverages. In this study, two qualitative media were compared using commercial esterase by optimizing medium selection and preparation and establishing the culture conditions for the preliminary screening of ester-producing microorganisms. The results show that tributyrin-containing YPD medium was more suitable for characterizing esterase production capacity. The optimal conditions involved the use of glass Petri dishes, observation after 4 hours of incubation, and an esterase concentration of 3.75 U∙mL-1 as the positive control. Using this qualitative medium, the esterase production capacities of four wild non-Saccharomyces yeast species—Wickerhamomycesanomalus, Issatchenkia terricola, Schizosaccharomyces japonicus, and Hanseniaspora uvarum—were further evaluated. Two Wickerhamomyces anomalus strains, and one Schizosaccharomyces japonicus strain with relatively high esterase production capacities were identified, whereas one Issatchenkia terricola strain and one Hanseniaspora uvarum strain did not show obvious esterase production capacity. Colony size was generally positively correlated with clear-zone size, providing an additional indicator for the quantitative characterization of esterase production capacity. This study provides a qualitative medium-based screening method for the preliminary screening of ester-producing microorganisms and the evaluation of their esterase production capacity. The selected yeasts strains with high esterase production capacity can increase ester concentrations and may serve as candidate strains for promoting the diversified development of alcoholic beverages.
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国家自然科学基金项目(32572542)
国家自然科学基金项目(32160544)
贵州省科技计划项目(黔科合基础-ZK[2023]重点007号
黔科合支撑[2024]一般116
黔科合支撑[2025]一般034
黔科合人才KJZY[2025]093
贵州省生态特色食品新质化加工与贮藏全省重点实验室项目(ZSYS[2025]023)
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