The stability of hop (Humulus lupulus L.) resins during long-period storage

Rutnik, Ksenija (author), Ocvirk, Miha (author), Košir, Iztok Jože (author)

The stability of alpha-acids, beta-acids and hop storage index (HSI) values under different conditions (aerobic/anaerobic, 4 °C/room temperature) was studied in a two-year trial. Six different varieties (Celeia, Aurora, Bobek, Styrian Gold, Savinjski Golding and Styrian Wolf) were used in the form of cones and pellets. Alpha- and beta-acids were determined by HPLC and HSI by spectrophotometry. Anaerobic conditions at 4 °C were best for alpha-acids, beta-acids and HSI values; however, 10–35% of the alpha-acids were still lost after two years. The decline was greater (63–99%) under aerobic conditions and at room temperature. Alpha-/beta-acid ratios increased in hop cones and decreased in hop pellets, whereas HSI values increased in all storage conditions. Overall, the performance was better for pellets than for hop cones. Storage conditions, storage form and hop variety had significant effects on the stability of hop resins.

• Language: English
• Keywords: alpha-acids, beta-acids, hop storage index, stability, hop storage
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: BF - Biotechnical Faculty
• Publication status: Published
• Publication version: Version of Record
• Year: 2023
• Number of pages: 16 str.
• Numbering: Vol. 12, iss. 4, art. 936
• PID: 20.500.12556/RUL-155621
• UDC: 633.791
• ISSN on article: 2223-7747
• DOI: 10.3390/plants12040936
• COBISS.SI-ID: 142465283
• Publication date in RUL: 08.04.2024

Record is a part of a journal

• Title: Plants
• Shortened title: Plants
• Publisher: MDPI
• ISSN: 2223-7747
• COBISS.SI-ID: 523345433

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: alfa-kisline, beta-kisline, indeks staranja hmelja, stabilnost, Humulus lupulus, hmelj, skladiščenje