Physical and Chemical Changes During Steeping Flashcards
What changes occur in a dormant kernel as it germinates?
Changes in metabolism and structure occur.
The kernel transitions to an actively growing grain.
What is the primary function of respiration in the grain during germination?
To convert sugar from the endosperm into energy for plant growth.
The by-products are CO2, water, and heat.
What is the respiration equation for the grain?
C6H12O6 + 6O2 —-> 6CO2 + 6H2O + 36 ATP + Heat.
This equation summarizes the process of cellular respiration.
During the steeping process, what does the grain primarily use?
The oxygen dissolved in the water.
This is insufficient for sustained growth.
What must the maltster do to facilitate grain growth?
Remove CO2 and heat and provide oxygen.
These actions are essential during air rests.
What triggers germination in grains?
An increase in moisture.
Moisture levels are critical for initiating the germination process.
What happens if only a small section of the endosperm is hydrated?
Enzymes can only access that section, leading to uneven endosperm modification.
Proper hydration is crucial for uniform modification.
What is the ideal moisture level for germination in the whole kernel?
43-46%.
This moisture level ensures optimal conditions for germination.
How does water enter the grain during germination?
Through the micropyle.
This is the point where water absorption occurs.
What is the movement pattern of water in the grain?
From areas of high water concentration to areas of lower water concentration.
This is guided by osmotic principles.
What does the semipermeable membrane covering the embryo do?
Allows water to flow into the grain and prevents sugar molecules from leaving.
This membrane plays a crucial role in maintaining internal conditions.
