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Stan Hieronymus joins me this week to discuss cutting edge research in the use of certain hop oils in beer brewing. Stan has some interesting results regarding which oils provide key flavors in IPAs and pale ales.

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Topics in This Week’s Episode (43:20)

  • Today my guest is Stan Hieronymus. Stan is the author of several books including For The Love of Hops, Brewing Local, Brew Like a Monk and Brewing with Wheat (Amazon affiliate links). Stan also runs a blog and newsletter at
  • We discuss Stan’s upcoming trip to South Africa as well as some of the interesting hop growing going on now in South Africa.
  • We begin a discussion on hop oils including the three major groups: hydrocarbons, oxygenated hydrocarbons and sulfur compounds that together make up only 1-4% of the hop cone.
  • He starts with hydrocarbons such as myrcene which are both volatile and not very soluble in wort, so these are best used in dry hopping
  • We discuss oxygenated compounds like linalool and geraniol which are more soluble and also aromatic. These also have the interesting characteristic of often being transformed during fermentation, and are therefore well utilized in whirlpool or steeped hopping at the end of the boil.
  • Stan explains some of the biotransformations that take place during fermentation.
  • We talk about sulfur compounds which make up less than 1% of the weight but play an important role in tropical flavors that have become popular in many recent IPAs.
  • Stan also shares some recent research in hop blending where blending oils from several different hops can duplicate certain other hop combinations and even create new unique flavor compounds.
  • He shares his thoughts on upcoming hop research as well as aromatic hop oil extracts which have become popular.
  • Stan shares his closing thoughts, and we briefly discuss his books, website and newsletter on hops.


Thanks to Stan Hieronymus for appearing on the show and also to you for listening! iTunes Announcements: I launched a new video channel for the BeerSmith podcast on iTunes, so subscribe now! At the moment it will only feature the new widescreen episodes (#75 and up). Older episodes are available on my revamped Youtube channel. Also all of my audio episodes are on iTunes now – so grab the older episodes if you missed any.

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