01/24 Notes

How is beer evaluated quantitatively?

Color

Perceived Bitterness

Alcohol Content

Apparently Attenuation

What is the most common way to measure color?

Standard Reference Method

On the SRM, what is the range for straw?

2-4

On the SRM, what is the range for gold?

6-7

On the SRM, what is the range for amber?

10-18

On the SRM, what is the range for brown?

19-30

On the SRM, what is the range for black?

35-40

How do you obtain SRM?

Measure the attenuation of light at 430 nm. Then use the SRM equation

What is D if undiluted?

1

What are the units of SRM?

unitless

Which system can be used to measure color?

Lovibond

How does the Lovibond system work?

Compares the color of substance to a series of amber to brown glass slides.

What are some factors that will influence the color of beer?

Barley Roasting

pH levels

Boil Time

Yeast Strain

Filtering

How is perceived bitterness measured by?

International Bitterness Units

What compound’s concentration is measured for bitterness?

Isohumulones

What is alcohol content measured by?

Alcohol by Volume

What is ABV a function of?

Specific Gravity

How are original gravity and final gravity measured?

Hydrometer

Refractometer

What is Apparent Attenuation (AA)?

The effectiveness of the yeast in converting sugars into ethanol

What characteristics of water impact beer?

Sodium

Chlorine

pH

Calcium

Sulfate

Magnesium

Why does pH matter in mashing?

Helps convert starches to sugars

Improves yeast health

Fight bacteria growth

Aid in hop extraction

Better coagulation of proteins

What does chloride enhance?

Maltiness

What does sodium enhance?

Bitterness

What does calcium and magnesium determine?

water hardness

How to make changes to water profile?

Gypsum

Calcium chloride

Epsom salt

Baking soda

Lactic Acid

What is barley?

Grains that are used to brew western bear

What is the aleurone layer?

A layer in the endosperm. It has the breakdown of the endosperm and starches into sugars.