Hops

Question 1

Are the male of female hops used for brewing?

Answer 1

Female

Question 2

Which part of the hop contains the resins and essential oils?

Answer 2

Lupulin

Question 3

Which latitudes do hops grow at?

Answer 3

Between 35 and 55 degrees either north or south

Question 4

Which state grows the most hops?

Answer 4

Washington

Question 5

What water content are hops harvested at?

What water content do they have to be dried to?

Answer 5

75-84%

9-11%

Question 6

Which hops have higher alpha acid content?

Aroma hops or Bittering hops?

Answer 6

Bittering hops

Question 7

4 factors to increase hop aroma effect

Answer 7

1. Volatilization
2. Late hopping
3. Dry hopping
4. Using fresh hops

Question 8

What are the 3 alpha acids in hops?

Answer 8

• Humulone
• Cohumulone
• Adhumulone

Question 9

What are the 3 beta acids in hops?

Answer 9

• Lupulone
• Colupulone
• Adlupulone

Question 10

How many different iso-alpha acids are present after isomerization?

Answer 10

6

There is a cis and trans verison of each alpha acid

Question 11

What is the bittering potential based on alpha acids and beta acids?

Answer 11

Bittering potential = alpha acids + beta acids/9

Question 12

What is the typical hop utilization rate of whole cone hops?

For hop pellets?

Answer 12

25%

30-40%

Question 13

What is the use of isomerised pellets and extracts?

Answer 13

They are added to increase the bittering but do not add aroma. They have much higher utilization rates

Question 14

An increase in cis-isomer alpha acids will increase or decrease bitterness?

Answer 14

Increase

Question 15

An increase in isocohumulone will increase or decrease bitterness?

Answer 15

decrease

Question 16

How do you quantify bitterness?

Answer 16

Measure the absorption of light at 275 nm and multiply by 50 to get the IBU value