water uptake Flashcards
(9 cards)
What is the effect of temperature on water uptake in barley?
Water uptake is faster at higher temperatures.
After six hours of steeping, moisture increases from 12% to 25% at temperatures between 10°C and 20°C, with a further increase to about 36% at 20°C after 14 hours compared to around 30% at 10°C.
What happens to α-amylase production when using higher temperature steep water?
It can limit the production of α-amylase.
Higher temperature steeping can negatively impact enzyme production during grain hydration.
How does grain size affect water absorption?
Smaller grains absorb water faster than larger grains.
Smaller grains reach higher moisture levels more quickly due to less material to hydrate and shorter distances for water migration.
What is the difference between mealy and steely grains in terms of water uptake?
Steely grains draw water up more slowly than mealy grains.
The steely endosperm is denser, making it harder for water to penetrate, unlike the more absorbent mealy endosperm.
Why are grains with both mealy and steely areas difficult to malt?
Because steeping long enough to hydrate the steely area risks overhydrating the mealy area.
This uneven modification can lead to inconsistent malt quality.
What effect does rain during ear filling have on husk integrity?
Rain can lead to husk splitting due to a rapid increase in grain volume.
Grains with split husks hydrate faster than those with intact husks.
Fill in the blank: After six hours of steeping, moisture levels increase from _____ to _____ at 20°C.
12% to 25%
True or False: Larger grains reach higher moisture levels faster than smaller grains.
False
Fill in the blank: The steely endosperm is like a _____, while the mealy endosperm is more like a _____.
stone; bath sponge
