Abstract
The hop storage index (HSI) is used to estimate losses of α-acids and β-acids during storage and handling. HSI is determined from the ultraviolet absorbance measured in the spectrophotometric analysis of hops. Collaborative tests of the HSI measurement gave 1.3% within-laboratory and 2.8% between-laboratory coefficients of variation. The relationship between % (α +β) lost and HSI shows some year to year variation. The slope of the equation % (a +β) lost = slope X log(HSI/constant) was 101.8, 111.3, 114.5, and 114.6 for the 1969, 1975, 1976, and 1977 crop years, respectively. The HSI has been used in evaluating varietal differences in storage, measuring permeability and antioxidant levels in lupulin glands, determining hopping rates in breweries, and evaluating grower and dealer handling practices.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of the American Society of Brewing Chemists
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
