Digital repository of Slovenian research organisations

Show document
A+ | A- | Help | SLO | ENG

Title:Možnost ponovne uporabe hmelja po hladnem hmeljenju
Authors:ID Kočevar Baloh, Ana (Author)
ID Obrovnik, Ksenija (Author)
ID Ocvirk, Miha (Author)
ID Košir, Iztok Jože (Author)
Files:URL URL - Source URL, visit https://www.dlib.si/details/URN:NBN:SI:spr-OS4I5CDJ
 
.pdf PDF - Presentation file, download (270,76 KB)
MD5: B39AA924A4145E0D066B851CD7836FC2
 
Language:Slovenian
Typology:1.04 - Professional Article
Organization:Logo IHPS - Slovenian Institute of Hop Research and Brewing
Abstract:Študija preučuje možnost ponovne uporabe hmelja po uporabi v postopku hladnega hmeljenja (dry hopping), kjer zaradi nizkih temperatur ne pride do znatne izomerizacije alfa-kislin. Namen raziskave je bil oceniti, ali tak hmelj po sušenju ohrani zadostno vsebnost grenčičnih spojin za učinkovito ponovno uporabo pri klasičnem vretju pivine. V raziskavi so bili uporabljeni briketi sort hmelja Styrian Dragon in Aurora, ki so bili vključeni v tri- oziroma petdnevno hladno hmeljenje, nato posušeni in ponovno uporabljeni pri varjenju piva. Grenčico v pivu smo določali spektrofotometrično (IBU) in s tekočinsko kromatografijo visoke ločljivosti (HPLC). Rezultati so pokazali, da se je po hladnem hmeljenju vsebnost alfa-kislin v hmelju zmanjšala za 29 % pri sorti Aurora in za 36 % pri sorti Styrian Dragon. Kljub temu je ponovno uporabljen hmelj omogočil tvorbo primerljivih ali celo višjih koncentracij izo-alfa-kislin v pivu kot svež hmelj, zlasti pri 60-minutnem vretju. Najvišje izmerjene vrednosti grenčice so presegale 90 IBU, kar potrjuje, da hmelj po hladnem hmeljenju ohrani zadosten grenčični potencial. Rezultati potrjujejo, da je ponovna uporaba hmelja po hladnem hmeljenju tehnološko izvedljiva in predstavlja trajnostno možnost za zmanjšanje odpadkov in stroškov surovin v pivovarski industriji.
Keywords:hmelj, hladno hmeljenje, ponovna uporaba, grenčica, izo-alfa-kisline
Publication date:19.12.2025
Year of publishing:2025
Number of pages:str. 39-44
Numbering:Št 32
PID:20.500.12556/DiRROS-27861 New window
UDC:582.630.2
ISSN on article:2536-1988
COBISS.SI-ID:262337283 New window
Copyright:Inštitut za hmeljarstvo in pivovarstvo Slovenije
Note:Nasl. z nasl. zaslona; Opis vira z dne 19. 12. 2025;
Publication date in DiRROS:26.02.2026
Views:110
Downloads:70
Metadata:XML DC-XML DC-RDF
:
Copy citation
  
Share:Bookmark and Share


Hover the mouse pointer over a document title to show the abstract or click on the title to get all document metadata.

Record is a part of a journal

Title:Hmeljarski bilten
Publisher:Inštitut za hmeljarstvo in pivovarstvo Slovenije (IHPS), = Slovenian Institute of Hop Research and Brewing (IHPS)
ISSN:2536-1988
COBISS.SI-ID:287262720 New window

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.
Licensing start date:01.01.2025

Secondary language

Language:English
Title:Possibility of reusing hops after dry hopping
Abstract:This study investigates the potential for reusing hops after the use in dry hopping process, during which low temperatures prevent the extend isomerization of alpha-acids. The aim was to evaluate whether such hops, once dried, retain sufficient quantity of bitter compounds for effective reuse in conventional kettle hopping. Two hop varieties, Styrian Dragon and Aurora, were used in three- and five-day dry hopping treatments, then dried and reused in kettle hopping. Bitterness was determined spectrophotometrically (IBU) and by high-performance liquid chromatography (HPLC). The results showed that alpha-acid content decreased by 29% in Aurora and by 36% in Styrian Dragon after dry hopping. Nevertheless, reused hops produced comparable or even higher concentrations of iso-alpha-acids than fresh hops, particularly after 60 minutes of wort boiling. The highest measured bitterness values exceeded 90 IBU, confirming that hops retain a sufficient bitterness potential after dry hopping. These findings demonstrate that reusing hops after dry hopping is technologically feasible and represents a sustainable approach to reducing waste and raw material costs in the brewing industry.
Keywords:hops, dry hopping, reuse, bitterness, iso-alpha-acids


Collection

This document is a part of these collections:
  1. Hmeljarski bilten

Back