Ludwig Narziß Award for Brewing Science
The EUR 2,500 award is designed to formally recognize those BrewingScience publications in which the results are particularly relevant for application in the brewing industry. For further information please refer to this article.
International Hop Standards Committee
New International Calibration Standard (ICS-R3) for HPLC Analysis of Rho-iso-alpha-acids
The International Hop Standards Committee (IHSC) announces the release of a new calibration standard, ICS-R3, for the HPLC analysis of Rho-iso-alpha-acids.
In April 2001, the ASBC, EBC, IoB (now IBD), and BCOJ approved the release of a set of HPLC standards for use in the quantitative determination of isomerized and reduced-isomerized alpha-acids in hop products and in beer. Four standards were produced:
- DCHA-Iso, ICS-I1 (Iso-alpha-acids standard);
- DCHA-Rho, ICS-R1 (Rho-iso-alpha-acids standard);
- Tetra, ICS-T1 (Tetrahydroiso-alpha-acids standard);
- DCHA-Hexa, ICS-H1 (Hexahydroiso-alpha-acids standard).
The purity of each standard was determined using various HPLC procedures, elemental analysis and other methods. Over a period of several years, the committee monitored the stocks of the four standards via careful HPLC analysis, finally concluding that the standards had maintained their declared compositions and had not undergone significant chemical change. Following exhaustion of the original stocks, the "Iso", "Rho", "Tetra" and "Hexa" standards were replaced by new standards, ICS-I2 (now followed by ICS-I3), ICS-R2, ICS-T2 (now followed by ICS-T3) and ICS-H2.
Stocks of ICS-R2 are now almost exhausted. In anticipation of this, in 2015 the subcommittee initiated the preparation of a replacement standard. This new standard, ICS-R3, now becomes the recommended standard and should be used for commercial transactions as well as for quality control purposes. Read more...