Besides whole hops (hop cones), other hop products are used in brewing beer, which fall into three general categories:
Non-isomerized Hop Products
The alpha acids are unchanged during processing non-isomerized products. As a result, the products can only be added to the kettle only during wort boiling.
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Isomerized Hop Products
With isomerized hop products, the alpha acids have been isomerized to iso-alpha acids to improve alpha-acid utilization and minimize boil times, both of which reduces costs. As a result, they can be added to the kettle not only during wort boiling, but also—unlike non-isomerized products—during the conditioning phase.
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Hop Oil Products
Pure hop oils usually have a very pale green/yellow appearance. They have been on the market for many years, and give beer hop aroma without imparting any bitterness.
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