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TTC法在筛选西瓜果酒酵母中的应用 总被引:1,自引:0,他引:1
利用TTC(2,3,5-氯化三苯基四氮唑)作为显色剂对酵母的代谢产物发生呈色反应,可以判断酵母生长过程呼吸酶活力的大小,即酵母产酒精能力的高低,进行快速筛选西瓜酒酵母。筛选出的酵母XH1#在与酿酒酵母和安琪酵母的发酵对比中,其产品西瓜果酒在颜色、气味、口感等感官评定指标方面都比对照样好。 相似文献
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以葡萄酒1#酵母、葡萄酒6#生产酵母和啤酒酵母为研究对象,采用3,5-二硝基水杨酸光度法和比重瓶法分别测还原糖和酒精,对酒精以外的糖消耗进行研究.结果表明,酒类生产酵母在酒精发酵进入减速阶段初时达到峰值,对于控制压榨酒的风味具有指导意义. 相似文献
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酱香白酒堆积发酵过程酒醅中酵母菌的分析研究 总被引:1,自引:0,他引:1
采用WL培养基对酱香型白酒生产堆积发酵过程酒醅中的酵母菌进行分离、形态学初筛和PCR产物扩增及26S rDNA定性鉴定分析,并对其中所获取的部分优选菌株的发酵性能及其发酵代谢风味成分贡献进行研究.结果表明,从堆积酒醅中共分离鉴定出S.cerevisiae,Z.bailii,R.mucilaginosa,K.exigua,I.orientalis,Pmembranaciens,S.pombe,D.hansenii,G.geotrichum等属种酵母;1#、3#、4#、8#、9#菌株对温度的耐受性较强,l#、2#、3#和8#具有较好的耐酒精特性;6#、2#和4#对酸环境的耐受性比较强;1#、4#、6#、11#、12#和13#菌发酵启酵快,CO2释放总量大,发酵残糖低;S.cerevisiae、K.exigua,I.orientalis、Z.bailii、G.geotrichum、Sch.pombe,K.exigua的几类酵母对酒体风味的贡献大. 相似文献
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以"蜀椹1号"成熟果实为原料,通过单因素试验研究了酵母、发酵时间、发酵温度、含糖量、酵母添加量和初始pH对发酵后桑果酒黄酮类化合物含量的影响;进一步通过正交试验对发酵温度、酵母添加量和初始pH进行优化,结果表明影响桑果酒中黄酮类化合物含量的主次顺序为初始pH发酵温度酵母添加量,最佳的发酵条件为酵母France-K_1、发酵时间6 d,含糖量200 g/L,发酵温度22℃、酵母添加量0.2 g/L、发酵初始pH 4,此条件下桑果酒中黄酮类化合物含量为4.03 g/L。为开发功能性桑果酒提供了理论依据和技术参考。 相似文献
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为了获得生产性能优良的菌株,采用PDA固体培养基平板涂布法从腌鱼中分离、纯化酵母菌,研究优势耐盐酵母菌株的生长温度、耐酸能力、耐亚硝酸盐能力等生理生化特性及ITS rDNA分子生物学鉴定。结果表明,15种不同种类腌制海鱼中共分离出436株酵母菌,经纯化后获得9株不同种属的酵母菌,通过不同NaCl含量的YPD液体培养基对9株酵母菌进行筛选,最终筛选出7#季也蒙毕赤酵母和9#奥默柯达酵母两株耐盐性较好的优势耐盐酵母菌菌株,耐盐能力分别达到9%和12%,最适生长温度均在28~32 ℃之间,最适pH在5~6之间,耐亚硝酸盐含量可达100 mg/kg。腌鱼中获得优势菌株具有良好的生长性能,可为腌鱼制品发酵剂的开发奠定基础。 相似文献
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Characterization and quantification of folates produced by yeast strains isolated from kefir granules 总被引:1,自引:0,他引:1
Johan D. M. Patring Sofia B. Hjortmo Jelena A. Jastrebova Ulla K. Svensson Thomas A. Andlid I. Margaretha Jägerstad 《European Food Research and Technology》2006,223(5):633-637
For the first time to our knowledge, distribution and content of individual folate forms in kefir yeast strains were investigated. This was done using a validated method based on reversed-phase high performance liquid chromatography (HPLC) with fluorescence and diode array (DAD) detection. Eight kefir yeast strains, belonging to different Candida and Saccharomyces species, were isolated from Russian kefir granules. They were grown in synthetic media at standardized conditions before analysis. The average folate content for these yeast strains was 10,780±550 μg/100 g dry matter. In all yeast strains tested, the most abundant folate forms as percentages were 5-methyltetrahydrofolate (43–59%), and 5-formyltetrahydrofolate (23–38%), whereas tetrahydrafolate occurred in a lesser proportion (19–23%). 相似文献
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酿酒酵母发酵性能的比较 总被引:1,自引:0,他引:1
以从民间自制黄酒酒药、酒厂的酒曲和窖泥中分离筛选得到的4株酵母(1#、2#、3#、4#为出发菌株,对其进行耐受酒精能力、耐受酸能力、发酵速率及发酵液中尿素含量、残糖、酒精度、总酸及氨基酸态氮等生理性能综合比较,其结果显示为4#酵母较其他3株发酵力强,耐受酒精浓度为14%vol,耐酸浓度为2.5%,产尿素含量为37.23mg/L,且其产尿素含量比2#酵母少56.7%,残糖浓度为12.57g/L,产酒精度达到16.1%vol,总酸含量为2.99g/L,氨基酸态氮含量为0.48g/L,具有进一步开发利用的价值. 相似文献
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研究3株不同来源的酵母拮抗菌(Crytococcus laurentii)001#、010#和012#的种间亲缘关系、Biolog微生物鉴定系统中的不同碳源物质代谢指纹图谱以及对于不同果蔬的侵染病原菌的生防效力。结果表明:亲缘关系相近的菌株001#和010#间的碳源代谢指纹图谱中存在43种相同的最适碳源和13种相同的可利用碳源,菌株012#则与001#和010#利用碳源情况差异性较大,但是它们分别在梨、油桃和芦笋果实上的生防效力却有一些差别,这可能与不同菌株所特异利用的碳源种类以及果蔬中含有的特异的碳源种类和含量有关。发现不同果实的碳源成分和比例引起的拮抗菌生防效果差异的现象,并揭示亲缘关系能在一定程度上通过菌株的碳源代谢特征表现出来,为酵母拮抗菌在生防效力作用机理研究提供参考。 相似文献
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为探索啤酒生产废水综合利用的方法和途径,采用液体发酵的方法,从7个酵母菌株中筛选出既能产微生物油脂和菌体蛋白,又能有效降解COD的菌株。考察了优良酵母菌株的发酵周期,并对其所产油脂的脂肪酸组成和菌体蛋白的氨基酸组成进行分析。结果表明:6#菌株——Trichosporon porosum D02、1#菌株——斯达油脂酵母Lipomyces starkeyi 1809对废水的资源化利用程度最高,6#和1#2个优良酵母菌株在发酵120 h时的油脂产量、菌体粗蛋白产量、COD降解率分别达到8.93 g/L、6.1 g/L、89.09%和4.62 g/L、4.42 g/L、81.47%。2个优良酵母菌株所产油脂的脂肪酸组成均以C_(16)和C_(18)系为主,含量最高的为油酸(C_(18∶1))和棕榈酸(C_(16∶0)),不饱和脂肪酸指数(IUFA)分别达到80.33%和61.57%。除脯氨酸未检出外,2个优良酵母菌株菌体蛋白均含有17种氨基酸,其中8种必需氨基酸占氨基酸总量的比例分别为44.14%和44.23%,可完全充当动物蛋白饲料。 相似文献
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The effect of yeast concentration on ultraviolet (UV) inactivation of five strains of Escherichia coli O157:H7 from different sources, inoculated both individually and simultaneously in orange juice, was analyzed and mathematically
modeled. The presence of yeast cells in orange juice decreases the performance of UV radiation on E. coli inactivation. UV absorption coefficients in the juice increased with increasing yeast concentration, and higher UV doses
were necessary to inactivate bacterial strains. UV intensities of I = 3.00 ± 0.3 mW/cm2 and exposure times (t) between 0 and 10 min were applied; radiation doses (energy, E = I × t) ranging between 0 and 2 J/cm2 were measured using a UV digital radiometer. All the tested individual strains showed higher resistance to the treatment
when UV radiation was applied at 4 °C in comparison to 20 °C. UV inactivation of E. coli O157:H7 individual strain was satisfactory fitted with a first order kinetic model. A linear relationship was found between
UV absorptivities and D values (radiation doses required to decrease microbial population by 90%) for each strain. The dose required to reach 5-log
reduction for the most unfavorable conditions that is the most UV resistant strain, and maximum background yeast concentration
was 2.19 J/cm2 at 4 °C (corresponding to 11 min of UV treatment) and 2.09 J/cm2 at 20 °C (corresponding to 10.55 min of UV treatment). When a cocktail of strains was inoculated in orange juice, the logistic
equation was the best model that fits the experimental results due to the deviation from the log-linear kinetics. The UV resistance
between strain cocktail and single strain were mathematically compared. Slopes of the decline curves for strain cocktail at
high UV doses were lower than the slopes of the log-linear equation calculated for the individual strains, even for the most
resistant one. Therefore, microbial inactivation tests using a cocktail of strains are particularly important to determine
the performance of the UV inactivation treatment. 相似文献