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中国精品科技期刊2020

苗家传统酸肉中产香酵母的筛选及鉴定

Screening and Identifying Aroma-producing Yeasts from Miao Traditional Sour Meat

  • 摘要: 针对微生物接种发酵技术在酸肉生产中虽能有效提升产品安全性,但难以同步保障风味品质的瓶颈问题,本研究以筛选兼具产香特性与安全性的酵母菌株为目标,采用微生物培养技术从传统苗家酸肉中定向分离菌株,通过嗅闻感官评价、肉用发酵剂安全性验证、肉糜发酵模型模拟及顶空固相微萃取-气相色谱-质谱联用(HS-SPME-GC-MS)技术等进行系统性筛选,最终确定最优菌株,并辅以DNA分子鉴定技术进行种属确认。结果共分离出198株菌株,其中11株表现出显著产香特征,经综合评估筛选出3株(Y6、Y7、Y8)性状优良。HS-SPME-GC-MS分析显示,Y8接种组中检测出23种挥发性物质,涵盖7类化合物,其中异戊醇、1-辛烯-3-醇、甲酸异戊酯、异佛尔酮、乙偶姻为关键性风味物质。定量分析表明,Y8组酯类物质相对丰度达13%、酸类物质的相对丰度达21.7%;嗅闻感官评定中,该菌株发酵样品呈现突出酸味与丰富风味特征。进一步通过气味活性值(OAV)分析发现,Y8组中1-辛烯-3-醇、甲酸异戊酯、乙偶姻的OAV均明显高于Y6组和Y7组,证实其产香优势。经鉴定,菌株Y8与酿酒酵母NRRL Y-12632的相似性为100%,最终鉴定为酿酒酵母。本研究为酸肉工业化生产提供了兼具安全性与风味的优良发酵剂菌种资源。

     

    Abstract: There existed the bottleneck of traditional microbial inoculation fermentation technology in sour meat production, where product safety enhancement is often accompanied by compromised flavor quality. We aimed to screen yeast strains with dual properties of aroma production and safety assurance. Strains were directionally isolated from traditional Miao sour meat using microbial culture techniques, followed by systematic screening through odor sensory evaluation, safety validation of meat fermentation starters, minced meat fermentation modeling, and headspace solid-phase microextraction-gas chromatography-mass spectrometry (HS-SPME-GC-MS). DNA molecular identification was employed for species confirmation. A total of 198 strains were isolated, with 11 exhibiting significant aroma-producing characteristics. Comprehensive evaluation identified three superior strains (Y6, Y7 and Y8). HS-SPME-GC-MS analysis of the Y8 inoculation group detected 23 volatile substances across seven compound classes, including the key flavor compounds such as isoamyl alcohol, 1-octen-3-ol, isoamyl formate, isophorone, and acetoin. Quantitative analysis revealed that esters and acids in the Y8 group accounted for 13% and 21.7% of relative abundance, respectively. Sensory evaluation highlighted its pronounced sour taste and rich flavor profile. Odor activity value (OAV) analysis further demonstrated that 1-octen-3-ol, isoamyl formate, and acetoin in Y8 group exhibited significantly higher OAVs than those in Y6 and Y7 groups, confirming its aroma-producing superiority. Strain Y8 was identified as Saccharomyces cerevisiae with 100% similarity to NRRL Y-12632. This work provides a high-quality fermentation starter resource for industrial sour meat production, integrating safety and flavor enhancement.

     

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