Ch. 28 - Applied and Industrial Microbiology

Tortora - Microbiology: An Introduction 14th Edition

Tortora14th EditionMicrobiology: An IntroductionISBN: 9780138200398Not the one you use?Change textbook

Tortora 14th Edition

Ch. 28 - Applied and Industrial Microbiology

Problem 5

Chapter 28, Problem 5

Beer is made with water, malt, and yeast; hops are added for flavor. What is the purpose of the water, malt, and yeast? What is malt?

Verified step by step guidance

Understand the role of water in beer production: Water acts as the main solvent and medium in which all other ingredients are mixed and processed. It influences the taste, clarity, and chemical reactions during brewing.

Identify the purpose of malt: Malt provides the fermentable sugars needed for yeast to produce alcohol and carbon dioxide. It also contributes to the beer's color, flavor, and body.

Explain what malt is: Malt is germinated cereal grains, usually barley, that have been dried in a process called malting. This process develops enzymes that convert starches into fermentable sugars.

Describe the role of yeast: Yeast is a microorganism that ferments the sugars extracted from malt, producing alcohol and carbon dioxide, which are essential for beer's alcoholic content and carbonation.

Summarize the combined roles: Water serves as the brewing medium, malt supplies fermentable sugars and flavor components, and yeast ferments those sugars to create alcohol and carbonation.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Role of Water in Beer Brewing

Water is the main ingredient in beer, acting as the solvent that dissolves malt sugars and other components. It influences the beer's flavor, mouthfeel, and chemical reactions during brewing, making its quality and mineral content crucial.

Function of Malt in Beer Production

Malt is germinated and dried cereal grains, usually barley, that provide fermentable sugars for yeast. It contributes to the beer's color, flavor, and body by supplying starches that are converted into sugars during mashing.

Role of Yeast in Fermentation

Yeast is a microorganism that ferments the sugars extracted from malt, producing alcohol and carbon dioxide. This fermentation process is essential for creating beer's alcohol content and carbonation, as well as influencing flavor profiles.

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Related Practice

Textbook Question

The term 12D treatment refers to

a. Heat treatment sufficient to kill 12 bacteria.

b. The use of 12 different treatments to preserve food.

c. A 10¹² reduction in C. botulinum endospores.

d. Any process that destroys thermophilic bacteria.

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Textbook Question

The manufacture of paper includes the use of bleach and formaldehyde-based glue. The microbial enzyme xylanase whitens paper by digesting dark lignins. Oxidase causes the fibers to stick together, and cellulase will remove ink. List three advantages of using these microbial enzymes over traditional chemical methods for making paper.

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Textbook Question

Use the following choices to answer the following question:

a. Bacillus coagulans

b. Byssochlamys

c. Flat sour spoilage

d. Lactobacillus

e. Thermophilic anaerobic spoilage

The spoilage of canned foods due to inadequate processing, accompanied by gas production.

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