国产和进口蜂蜜中嗜渗酵母的检出调查和菌种鉴定
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1.河北科技师范学院 食品科技学院;2.秦皇岛海关技术中心

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海关总署科研项目(2022HK023)


Detection and strain identification of osmophilic yeast in domestic and imported honey
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Affiliation:

1.College of Food Science and Technology, Hebei Normal University of Science and Technology;2.Qinhuangdao Customs Technical Center

Fund Project:

Research Project of General Administration of Customs (2022HK023)

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    摘要:

    目的 对国内外蜂蜜中嗜渗酵母进行检测,并对其中部分样品中分离菌株进行种属鉴定和特性试验。方法 选取916批国产和进口蜂蜜,根据GB 14963—2011《食品安全国家标准 蜂蜜》和GB 4789.2—2022《食品安全国家标准 食品微生物学检验 菌落总数测定》对蜂蜜样品进行嗜渗酵母计数,并计算出嗜渗酵母检出率。对分离菌株经26S rDNA PCR扩增,进行测序和序列比对分析,确定属种。通过吸光度法和重铬酸钾比色法对部分分离酵母菌株耐高糖和产酒精能力进行检测。结果 在916批次蜂蜜中,共检出嗜渗酵母36批,检出率为3.93%;其中国产蜜786批,共检出嗜渗酵母33批,检出率为4.20%,嗜渗酵母计数为2.5×102?7×104 CFU/g;进口蜜130批,共检出嗜渗酵母3批,检出率为2.31%,嗜渗酵母计数为1×101?7×101 CFU/g。分离得到5株嗜渗酵母,1株为假霉蚜虫酵母(Moesziomyces aphidis/Pseudozyma sp., M.aphidis),3株为蜂蜜接合酵母(Zygosaccharomyces mellis, Z. mellis),1株为木兰假丝酵母(Candida magnoliae, C.magnoliae),所试验菌株对高浓度糖耐受性良好并且全都有一定的产酒精能力。结论 蜂蜜存在着被嗜渗酵母污染的可能,需要加强控制和管理;蜂蜜可以作为筛选耐渗透压菌种的来源,选育蜂蜜嗜渗酵母有助于蜂蜜食品发酵工业的发展和优秀产品的研发。

    Abstract:

    Osmophilic yeast in honey at home and abroad was detected, and the strains isolated from some samples were identified and their characteristics tested. Methods A total of 916 batches of domestic and imported honey were selected, and osmophilic yeast was counted according to GB 14963-2011 "National Standard Honey for Food Safety" and GB 4789.2-2022 "Determination of the total number of colonies for microbial Inspection of National Standard Food Safety", and the detection rate of osmophilic yeast was calculated. The isolated strains were amplified by 26S rDNA PCR, and the sequences were sequenced and compared to determine the species. The ability of some yeast strains to tolerate high sugar and produce alcohol was tested by absorbance and potassium bichromate colorimetry. Results In 916 batches of honey, 36 batches of osmophilic yeast were detected, and the detection rate was 3.93%. Among 786 batches of domestic honey, 33 batches of osmophilic yeast were detected, the detection rate was 4.20%, and the osmophilic yeast count was 2.5×102 ~ 7×104 CFU/g. Three osmophilic yeasts were detected in 130 batches of imported honey, the detection rate was 2.31%, and the osmophilic yeast count was 1×101 ~ 7×101 CFU/g. Five osmophilic yeast strains were isolated, one was Moesziomyces aphidis/Pseudozyma sp., and three were Zygosaccharomyces mellis. One was Candida magnoliae , and all of the tested strains were well tolerant to high glucose concentrations and had some capacity to produce alcohol. Conclusion Honey may be contaminated by osmophilic yeast, so it is necessary to strengthen its control and management. Honey can be used as a source for screening osmolal-resistant strains, and the selection of osmophilic yeast is helpful to the development of honey food fermentation industry and the research and development of excellent products.

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  • 收稿日期:2024-01-17
  • 最后修改日期:2024-04-30
  • 录用日期:2024-05-22
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