brewing yeast fermentation performance 2002

[...]... the fermentation performance of lager brewing yeast 24.3.4 Impact of fermentation on the replicative capacity of lager brewing yeast 24.3.5 Impact of serial repitching on the attenuation of lager brewing yeast 24.3.6 Impact of serial repitching on the flavour development of lager brewing yeast 24.3.7 Impact of serial repitching on the flocculation capacity and cell-surface characteristics of lager brewing. .. osmotic pressure on fermentation power 9.3 Results and discussion 9.3.1 Influence of yeast peptide complex on fermentation rate 9.3.2 Influence of yeast peptide complex on glucose metabolism 9.3.3 Influence of yeast peptide complex on anabolic enzyme activities 9.3.4 Influence of yeast peptide complex on yeast synthesis 9.3.5 Mode of action of yeast peptide complex 9.3.6 Influence of yeast peptide complex... Part 2 Brewing Yeast Stress Responses During Handling 3 The impact of ethanol stress on yeast physiology A Lentini, P Rogers, V Higgins, I Dawes, M Chandler, G Stanley and P Chambers 3.1 Introduction 3.2 Materials and methods 3.2.1 Yeast storage trials 3.2.1.1 Membrane lipid composition 3.2.1.2 Trehalose content 3.2.1.3 Yeast slurry pH 3.2.1.4 Yeast protease 3.2.1.5 Yeast viability 3.2.1.6 Yeast vitality... stationary-phase brewing yeast and its effects on growth and fermentation ability N Moonjai, K.J Verstrepen, F.R Delvaux, G Derdelinckx and H Verachtert 10.1 Introduction 10.2 Materials and methods 10.2.1 Yeast strain and maintenance 10.2.2 Growth medium 10.2.3 Yeast propagation 10.2.4 Preparation of stationary-phase cells and unsaturated fatty acid supplementation 10.2.5 Analysis of pitching yeast 10.2.6 Test fermentations... lager brewing yeast 26.3.2 Chronological lifespan of four strains of lager brewing yeast 26.3.3 Is there a correlation between replicative and chronological lifespan? 26.3.4 Do chronologically aged brewing yeast cells demonstrate a reduced replicative lifespan? 26.4 Conclusions Acknowledgements References xxiii 283 284 284 284 284 284 284 285 285 285 285 286 287 288 289 290 290 27 Continuous primary fermentation. .. fermentation performance through successive fermentations remain areas of active interest for the brewing industry To be able to control and perhaps even manipulate yeast activity, it is necessary to identify factors that affect its functionality during fermentation Genetic stability and integrity are crucial to maintaining predictable performance The brewing yeast genome is inherently unstable, leading... in both wort composition and yeast quality is reflected in final beer quality and in particular beer flavour The role of the yeast cell in flavour attributes is therefore dependent on both intrinsic and extrinsic factors It is not unreasonable to suggest that the physiological condition of brewing yeast influences fermentation performance, therefore brewers require consistent yeast quality and quantity Ensuring... observation that translocation occurred at a frequency of 10Ϫ5 during yeast cultivation 1.1 Introduction Genetic changes of bottom-fermenting yeast have been reported.1,2 Such changes may give rise to instabilities and, therefore, affect the performance of the bottomfermenting yeast during fermentation To control the quality of yeast for fermentation, it is important to know the environmental factors that... from the start of culture Moreover, bottom-fermenting yeasts have many more chromosomes than laboratory yeasts, preventing adequate separation of each chromosome Bottom-fermenting yeasts are known to have an unusual genomic background.5 Not only are they polyploid strains, but they have at least two different genomic sets 4 BREWING YEAST FERMENTATION PERFORMANCE One genomic set is structurally similar... 21.4 Parameters influencing the synthesis of beer esters 21.5 Influence of the yeast characteristics on the synthesis of esters 21.5.1 Yeast strain 21.5.2 Pitching rate 21.5.3 Genetic and physiological instability of brewing yeast 21.6 Physicochemical and technological parameters affecting the production of esters during brewing fermentation 21.6.1 Influence of lipids on ester synthesis 21.7 Influence of . Brewing Yeast Fermentation Performance Brewing Yeast Fermentation Performance Second edition Edited by KATHERINE SMART Oxford Brookes. 26 3.2.1 Yeast storage trials 26 3.2.1.1 Membrane lipid composition 26 3.2.1.2 Trehalose content 26 3.2.1.3 Yeast slurry pH 26 3.2.1.4 Yeast protease 26 3.2.1.5 Yeast viability 26 3.2.1.6 Yeast. of yeast peptide complex on anabolic enzyme activities 103 9.3.4 Influence of yeast peptide complex on yeast synthesis 105 9.3.5 Mode of action of yeast peptide complex 106 9.3.6 Influence of yeast