Isothermal Mashing Flashcards
(20 cards)
What does the term isothermal mean?
Maintained at a single temperature
Derived from Greek ‘isos’ meaning the same, and ‘thermal’ meaning temperature.
What is isothermal mashing primarily used for?
Ale production in the UK and by smaller brewers worldwide
What equipment is used for isothermal mashing?
Mash tun
The mash tun also serves as a wort separation device.
What is a limitation of a mash tun?
It cannot heat or mix the mash
What determines the temperature used in isothermal mashing?
The strike temperature of the mashing water
What is the minimum temperature required to gelatinise starch in an isothermal mash?
Above 62℃
What happens to β-amylase activity at 63℃?
It is at its optimum temperature
What is the effect of selecting 63℃ for mashing?
High proportion of maltose but low extract recovery
What is the impact of 63℃ on limit dextrinase?
It is above the optimum temperature, resulting in low debranching rate
What kind of beers result from mashing at 63℃?
Beers with low levels of residual carbohydrate and good biological stability
What is considered a compromise temperature for mashing?
66℃
What is the advantage of mashing at 66℃?
Best compromise between extract yield and fermentability
How does the fermentability of wort at 66℃ compare to that at 63℃?
Lower than at 63℃ but still biologically stable
What happens to fermentability with temperatures above 67℃?
It declines rapidly
What must be true about the malt used in isothermal mashing?
It must be well-modified
What is a good mashing temperature for well-modified malt?
Around 66℃
What are some advantages of isothermal mashing?
Quick, simple, and low equipment cost
What are some disadvantages of isothermal mashing?
Low extracts, expensive malt, and limited adjunct options
Fill in the blank: The malt required for isothermal mashing is _______.
Expensive
What is the next mashing method discussed after isothermal mashing?
Temperature-programmed mashing
