Week+9-2 - Introductory Microbiology Week 9 Vijay Ramprasad...

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Introductory Microbiology Week 9 Vijay Ramprasad
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Tasks for today 1. Beer 1 2. Yogurt 1 3. Growth Curve 2 4. Azotobacter 5 5. Winogradsky Coloumn 5
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Beer Historically important. One of the ways ancient peoples obtained nutrition, purified consumable liquids, stored grains and cereals, and of course it’s the best edible escapism Any cereal grain can be used to make beer, examples: rice, potato, cane sugar based beers Most common grain is barley Malting is the process in which grain (or a mixture of various grains, depending on the brewer) is briefly allowed to germinate to promote breakdown of stored sugars Malting involves two steps: soaking (~ 48 hrs), roasting
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The roasted barley kernels are ground and mixed with water to form a ‘mash’. Enzymes in the grain convert the starches of the mashed grains into sugar –which is called wort Wort is boiled and Hops are added to create a ‘hopped wort’.
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Week+9-2 - Introductory Microbiology Week 9 Vijay Ramprasad...

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