tailieunhanh - WORT & BEER CLARIFICATION MANUAL

Literature reports comparing Ethiopian Boran with other indigenous Ethiopian cattle breeds indicate better growth performance for Ethiopian Boran (Table 2). Additionally, through improvement in management and selection, performance of Boran has been substantially improved. For example, the improved Boran is heavier at birth averaging 30 kg (DAGRIS 2006) and at Abernossa ranch in Ethiopia the weaning weight was estimated at 158 kg (Banjaw and Haile-Mariam 1994). This variation indicates the potential that can be exploited by within breed selection and improvement in management. . | BREWERS SUPPLY GROUP WORT BEER CLARIFICATION MANUAL Ian L Ward Contents Introduction 1 Settlement of Solids 2 The Nature of Beer Particles 3 Origin and Control of Particles in the Brewing Process 4 Use of Fining Agents to Enhance NMP Separation 6 Kettle Fining 7 Kettle Fining Agents 7 Carrageenan Chemistry and Reaction Mechanism 8 Thermal Stability of k- Carrageenan 9 Factors Affecting Performance 11 Dose Rate 11 Time of Addition 12 Hot Wort Clarity 12 Wort pH 12 Malt Variety Quality Season 13 Wort Gravity 14 Wort Polyphenol Levels 14 Salt Concentrations 14 Mashing T emperature 15 Ensuring Optimum Kettle Fining Dose Rate 15 Isinglass Auxiliary Fining 16 Beer Fining Agents 16 Thernal Stability of Isinglass 17 Viscosity of Isinglass Finings 18 Isinglass Reaction Mechanism 19 Isinglass Concentration Nomenclature and Analysis 19 Isinglass Quality 19 Auxiliary Finings 20 Factors Affecting Isinglass Fining Performance 21 Isinglass Type 22 Finings Quality 23 Beer pH 23 Beer Particle Levels 23 Yeast Viability and Count 24 Microbiological Contamination 25 Beer Colour 26 Effect of T emperature 26 Finings Application 26 The Benefits of Finings Technology 28 Secondary Effects of Clarification Agents 31 Summary 33 References 34 Appendix Methods 35 Microscopic Examination of Beers 35 Cask Beer Finings Optimisation 36 Process Beer Finings Optimisation 37 Introduction It is widely acknowledged that visual appeal is a major factor in the mind of the consumer when selecting a beer. Given the amount of revenue spent upon advertising a product it is essential that the product lives up to the promotion claims in order to avoid customer disappointment. A vital part of the presentation is clarity. In the case of cask beer the brewer is totally reliant upon the use of finings to achieve optimum clarity. For brewery conditioned beers considerable process advantages may be gained from the application of finings. Against this background this manual aims to set out the principles behind the .