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《食品科学》2020,(14)
为进一步解析酱香型白酒传统固态发酵过程中复杂的微生物体系,采用高通量测序等方法对酱香型白酒1轮次堆积发酵和窖池发酵酒醅中的细菌菌群结构进行研究,结果表明堆积发酵过程的细菌多样性和丰富度均高于窖池发酵,进入窖池发酵阶段,细菌的多样性和丰富度呈现急剧大幅下降。在门和属水平上,堆积发酵检出的总细菌、主要细菌和优势细菌种类均比窖池发酵同比数据多;进入窖池发酵后,微生态很快就由复杂的多菌属生态结构演替为单一的乳酸杆菌属(Lactobacillus)为主导的生态结构。堆积发酵过程优势细菌属有乳酸杆菌属等13个,其中乳酸杆菌属、埃希氏菌属(Escherichia-Shigella)和芽孢杆菌属(Bacillus)占主导地位。窖池发酵阶段乳酸杆菌属占绝对主导地位。堆积和窖池发酵细菌属水平总丰度前25的物种之间绝大多数呈显著正相关,堆积发酵过程乳酸杆菌属对其生态内的其他菌属的抑制作用强于窖池发酵。研究结果揭示了酱香型白酒1轮次堆积和窖池发酵过程中的细菌菌群结构,为传统白酒固态发酵机制及产业发展奠定了科学基础。 相似文献
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为探究酱香型白酒二轮次发酵过程中微生物群落结构的变化、微生物多样性以及物种与样品之间的关系,应用高通量测序技术对酱香型白酒第二轮次酒生产堆积及窖池发酵过程酒醅中微生物的多样性及其主要功能菌群进行研究。结果表明,在堆积过程中共检测到细菌138个属,真菌54个属;窖池发酵过程中共检测到细菌262个属,真菌267个属。酒醅中主要细菌类群为Firmicutes和Proteobacteria,主要真菌类群为Ascomycota和Basidiomycota。堆积过程中绝对优势细菌属有Bacillus、Enterococcus、Lactococcus、Lactobacillus;绝对优势真菌属有Thermoascus、Thermomyces、Candida、Aspergillus。在窖池发酵酒醅中其绝对优势细菌属为Lactobacillus;绝对优势真菌属为Saccharomyces、Candida、Penicillium、Fusarium。由于堆积、窖池发酵酒醅所处发酵环境、发酵物料物态及其工艺参数差异较大原因,使得两者之间生物物种存在较大差异。 相似文献
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不同窖龄窖泥微生态变化研究 总被引:1,自引:0,他引:1
对泸州老窖不同窖龄的窖底泥与窖壁泥中的微生物变化进行了研究.结果表明:窖壁泥的好氧细菌数量和窖底泥的好氧芽孢细菌数量均随着窖龄的增加呈逐渐降低趋势,而窖壁泥的好氧芽孢细菌数量和窖底泥的好氧细菌数量均随着窖龄的增加呈先降后升的趋势;窖底泥的厌氧细菌和厌氧芽孢细菌以及窖壁泥的厌氧芽袍细菌数量随着窖龄的增加呈逐渐增加的趋势,不同窖龄的窖壁泥的厌氧细菌数量没有明显差异;不同窖龄的窖泥的好氧细菌、好氧芽孢细菌、厌氧细菌以及厌氧芽孢细菌数量总趋势为窖底泥显著高于窖壁泥;不同窖龄的窖泥中的霉菌和酵母菌数量均较少. 相似文献
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浓香型白酒窖池糟醅原核微生物区系的分类研究 总被引:6,自引:3,他引:3
为了探讨中国传统白酒窖池糟醅中的原核微生物区系的构成及变化,运用PCR扩增技术和16SrDNA序列同源性分析等方法测定糟醅中原核微生物的16SrDNA基因全序列,根据与基因数据库中相似菌群16SrDNA序列的同源性,分析窖池糟醅中原核微生物的生理特性和区系分布。结果发现,发酵60d的浓香型白酒糟醅中,真细菌主要分为6个菌群:低GKmol%革兰氏阳性菌、高G Cmol%革兰氏阳性放线菌群、革兰氏阴性拟杆菌群、革兰氏阴性变形杆菌群、革兰氏阳性纤毛菌群和耵Ⅵ7门,其中β-变形杆菌群约占窖池糟醅中原核微生物的80%;古菌主要为产甲烷古细菌,包括Methanoculleus群和Methanospirillum群。通过不同窖池的比较分析得出,微生物的多样性与窖池微生态密切相关。 相似文献
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Objectives
To analyse trends in smoking prevalence in Ukraine from three surveys conducted in 2001–5, and to explore correlates of observed changes, in order to estimate the stage of tobacco epidemic in Ukraine.Design
Repeated national interview surveys in Ukraine in 2001, 2002 and 2005.Main outcome measure
Prevalence of current smoking among the population aged ⩾15 years.Results
The age‐standardised prevalence of current smoking in Ukrainian men was 54.8% in 2001 and 66.8% in 2005. Among Ukrainian women, prevalence increased from 11.5% in 2001 to 20.0% in 2005. ORs for yearly increase in prevalence were estimated as 1.164 (95% CI 1.111 to 1.220) for men and 1.187 (1.124 to 1.253) for women, which implies that, on average, 3–4% of men and 1.5–2% of women living in Ukraine join the smoking population each year.Conclusions
In Ukraine, smoking prevalence is increasing in most population groups. Among men, the medium deprivation group with secondary education has the highest smoking prevalence. Among women, while the most educated, young and those living in larger cities are the leading group for tobacco use, other groups are also increasing their tobacco use. Tobacco promotion efforts appear to have been significantly more effective in Ukraine than smoking control efforts. The decrease in real cigarette prices in Ukraine in 2001–5 could be the main factor explaining the recent growth in smoking prevalence.Ukraine is a large eastern European country with high smoking prevalence. Tobacco products are widely available at very low prices, and the transnational tobacco industry is extremely successful in promoting its products and lobbying for its interests in the legislative field. Advocacy of tobacco control has only recently achieved some success in the legislative field, with the first tobacco control law being adopted in late 2005. Ukraine ratified the Framework Convention on Tobacco Control in 2006, but there is still much cause for concern regarding the enforcement and effectiveness of the adopted legislative measures. Unfortunately, the government is not yet involved in nationwide surveillance of the tobacco problem, and the available data have mostly been gathered with funding from foreign donors. Several attempts have been made to measure the extent of the tobacco epidemic in the countries of the former Soviet Union (FSU).1,2,3,4,5,6,7 Most of these studies have shown rather high smoking prevalence among men (50–70%) and comparatively low prevalence among women (5–20%). Most countries in the FSU have similar smoking rates, while certain trends are shown to be related to the differences in how the transnational tobacco industry succeeds in every national tobacco market.6 Unfortunately, few studies have been published showing trends in smoking prevalence in the FSU.7 In Ukraine, two studies3,4 provided point estimates of smoking prevalence.The aim of this study was to analyse trends in smoking prevalence in Ukraine, on the basis of three surveys conducted in 2001–5, and to explore correlates of observed changes in order to estimate the stage of the tobacco epidemic in Ukraine. 相似文献16.
了解河南省部分食品中重金属污染的现状。方法 在河南省18个省辖市采集8大类3 657份食品样品,按照国家标准检测食品中铅、镉和汞的含量,检测结果按照GB 2762—2012《食品安全国家标准食品中污染物限量》进行评价。结果 河南省部分食品中铅含量的平均值为0.34 mg/kg,总体超标率为8.8%(320/3 656),其中粮食、肉类和蔬菜中超标率较高,分别为17.2%(95/552)、14.5%(85/587)和10.7%(57/534);部分食品中镉含量的平均值为0.054 mg/kg,总体超标率为3.9%(143/3 657),其中食用菌和蛋类中超标率较高,分别为9.6%(49/508)和8.1%(42/518);部分食品中汞含量的平均值为0.077 mg/kg,总体超标率为8.3%(303/3 657),其中蔬菜和粮食中超标率较高,分别为25.3%(135/534)和12.3%(68/551)。结论 河南省部分食品中铅、汞污染情况较为严重,其中粮食、蔬菜和肉类食品中污染情况尤为突出,需要加强监管。 相似文献
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R. B. Sashidhar Y. Ramakrishna Ramesh V. Bhat 《Journal of Stored Products Research》1992,28(4):257-260
Various traditional containers have been used in India for storage of sorghum grains. Sorghum is susceptible to fungal infestation and toxin elaboration. The present study relates to the mould and mycotoxin contamination (aflatoxin B1 and T-2 toxin) in stored sorghum in different storage containers viz. “Kotlu” (Storage rooms), earthenware pots, gunny bags and reed baskets. Aspergillus sp. and Fusarium sp. were the prominent genera and the “Kotlu” form of storage was most susceptible to fungal attack. Storage treatment had little effect on fungal contamination, but despite the fungal infestation, the mycotoxin contamination was found to be very low. 相似文献
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目的 了解山西省食源性致病菌的污染现状.方法 按照2010年度《全国食源性致病菌监测工作手册》进行.结果 1 576份样品中共检出阳性菌株149株,检出率为9.45%,其中单核细胞增生李斯特氏菌、副溶血性弧菌污染比较严重,总检出率为9.50%和8.22%,金黄色葡萄球菌、阪崎肠杆菌和沙门氏菌的总检出率分别为3.02%、1.11%和0.87%.不同类别食品中致病菌的检出率差异较大,生肉中致病菌的检出率高居榜首为49.33%,主要污染菌为沙门氏菌、单核细胞增生李斯特氏菌;沙拉中致病菌的检出率为17.39%,主要污染菌为单核细胞增生李斯特氏菌、金黄色葡萄球菌;生食水产品中致病菌的检出率为16.94%,主要污染菌为单核细胞增生李斯特氏菌、副溶血性孤菌;熟肉制品中致病菌的检出率为9.84%,主要污染菌为单核细胞增生李斯特氏菌、金黄色葡萄球菌、沙门氏菌;中式凉拌菜中致病菌的检出率为8.89%,主要污染菌为金黄色葡萄球菌;鲜榨果汁中致病菌的检出率为6.67%,主要污染菌为金黄色葡萄球菌;鲜冻水产品中致病菌的检出率为5.00%,主要污染菌为副溶血性弧菌;婴幼儿配方粉/米粉/谷粉/豆奶粉中阪崎杆菌的检出率为1.11%.结论 山西省多种食品均存在食源性致病菌不同程度的污染,应加大对散装食品、即食食品和生食水产品的监管. 相似文献