共查询到20条相似文献，搜索用时 46 毫秒
2.
4.
5.
6.
7.
9.
10.
4-乙烯基愈创木酚(4-VG)是小麦啤酒中的重要风味物质.为促进4-VG的合成,以大麦芽和小麦芽为原料,上面啤酒酵母WA-04为发酵菌种,采用单因素试验结合响应面法优化小麦啤酒的酿造工艺,并通过研究发酵过程中4-VG的动态变化构建发酵动力学模型.结果表明:小麦啤酒酿造的最佳工艺条件为小麦芽添加量45.9％,酵母接种量1... 相似文献
11.
对啤酒中的成分进行研究,重点分析了引起啤酒“上头”的因素,结合啤酒厂的实际采取了适当提高糖化温度、减少麦汁充氧、提高酵母接种量以及降低主酵前期的发酵温度等四项工艺调整措施,有效的降低了引起“上头”物质的含量。并通过人群饮用试验,验证了工艺措施的可行性。 相似文献
12.
发酵条件对啤酒中乙醛及高级醇含量的影响 总被引：1，自引：0，他引：1
乙醛及高级醇的含量高是啤酒上头的主要原因.研究了啤酒发酵条件对两者的影响,实验结果表明,适当的提高发酵初期的发酵温度及减少酵母添加量可以有效地降低啤酒中乙醛的含量,而降低麦汁溶氧量和主酵温度可使高级醇含量显著降低. 相似文献
13.
ATF1过表达和BAT2敲除酿酒酵母发酵性能的研究 总被引：1，自引：0，他引：1
以啤酒酵母工业菌株S5为对照,对过表达醇乙酰基转移酶编码基因ATF1同时敲除氨基酸转氨酶编码基因BAT2酿酒酵母工程菌株S5-1进行发酵性能的研究。结果表明,与出发菌株相比,突变株生长状况、发酵速度、酒精度等基本发酵性能没有明显变化,而突变株发酵后的乙酸酯总量有较大程度的提升,为85.44mg/L,提高了6.96倍,高级醇总量有较大程度的下降,为79.25mg/L,降低了27.28%。研究结果为啤酒风味的改善奠定了良好的基础。 相似文献
14.
16.
Miha Ocvirk Nataša Kočar Mlinarič Iztok J Košir 《Journal of the science of food and agriculture》2018,98(10):3627-3635
17.
高级醇对啤酒风味的影响及其在啤酒生产中的控制措施 总被引：7，自引：1，他引：7
高级醇是构成啤酒酒体的重要物质 ,是啤酒酿造过程中不可避免的副产物。高级醇赋予啤酒醇厚感、泡沫细腻 ,使啤酒丰满 ,但含量太高会破坏啤酒酒体及风味。影响和控制啤酒酿造过程中高级醇含量的因素有啤酒酵母、麦芽质量、麦汁成分和发酵工艺 (如发酵温度、发酵方法、发酵度 )等。 相似文献
18.
Jan A. Delcour Pieter Dondeyne Eugene K. Trousdale Vernon L. Singleton 《Journal of the Institute of Brewing》1982,88(4):234-243
The reactions and interactions between proteins and polyphenols are, among other phenomena, responsible for haze formation in beer. The participation of aldehydes in the polymerisation of polyphenols is considered. The formation of phenolic Baeyer-type condensation products containing phenolic residues linked by CH3CH-bridges through reaction with acetaldehyde is possible at the pH of beer (4.0). These and other reactions with acetaldehyde in beer participate in beer haze formation. 相似文献
19.
A powerful technique was developed for the identification and quantification of 9 volatile compounds of beer, using headspace solid phase micro-extraction (HS/SPME) and gas chromatograph coupled to a mass spectrometer and a flame ionization detector (GC/MS/FID). Optimized parameters included type of fiber, desorption time, and exposure time. Optimization was achieved with standard solutions of the target compounds. All samples were analyzed in triplicate. An exposure time of 45 min with PDMS fiber in the sample headspace was enough to reach equilibrium of the phases. A desorption time of 15 min in the gas chromatograph injector was enough for the fiber to desorb the target compounds. It was found that less polar compounds were more readily absorbed by the fiber (for example, isoamyl acetate) than more polar compounds (for example, acetaldehyde), under the extraction conditions, due to the nature of the fiber. Extraction conditions are important criteria to perform a good quantification of volatile compounds. Concentrations found in sampled beer, for the compounds of interest, ranged between 0.32 and 41.7 ppm. Results show that the reproducibility of the technique depends on the compounds. Esters have higher values (RSD mean value 5.05%) than higher alcohols (RSD mean value 2.5%) and aldehydes (RSD 3.7%). The simplicity of the validated methodology enables its use as a regular quality control procedure for beer flavor analysis. PRACTICAL APPLICATION: This study describes a technique successfully used to identify and quantify volatiles of interest in beer that can be used for quality control purposes under normal brewery production conditions. The technique uses a gas chromatograph coupled to a mass spectrometer with a flame ionization detector. 相似文献
20.
H. Schneiderbanger J. Koob S. Poltinger F. Jacob M. Hutzler 《Journal of the Institute of Brewing》2016,122(3):403-411
The synthesis of aroma compounds represents one of the most important parameters in beer production. Although it has been a historical topic of research, exactly how aroma components are formed has yet to be fully explained. Moreover, all of the research that has been published on yeast strains is focused on lagers and ales. Wheat beer yeast strains have not been the focus of aroma and flavour research. In this study, five different wheat beer yeasts were analysed to determine their capacity for producing acetate esters. In this study, the most commonly used wheat beer yeast strains for the production of German‐style wheat beer were analysed. This involved measuring the level of expression of the alcohol acetyl transferase genes ATF1, ATF2 and IAH1 over a period of 4 days (during primary fermentation) and plotting the data to observe the development of expression of the genes over time. Results confirmed their capacity to form acetate esters and showed a distinct correlation with increasing expression of the gene ATF1. However, the findings also indicated that gene expression in different yeast strains can vary considerably during fermentation. Copyright © 2016 The Institute of Brewing & Distilling 相似文献