Effect of Wort Boiling System and Hopping Regime on Wort and Beer Stale-Flavor Aldehydes.

The main factor responsible for the sensory aging of beer is the increase in off-flavor aldehydes during beer storage. In pilot brews (200 L) of pale lager beer with different hopping regimes and wort boiling systems, 15 carbonyls were monitored using the GC-MS method. Factor analysis revealed several groups of aldehydes with similar behavior during wort boiling.

Strong Antimicrobial and Healing Effects of Beta-Acids from Hops in Methicillin-Resistant -Infected External Wounds In Vivo.

() is an important causative agent of wound infections with increasing incidence in the past decades. Specifically, the emergence of methicillin-resistant (MRSA) causes serious problems, especially in nosocomial infections. Therefore, there is an urgent need to develop of alternative or supportive antimicrobial therapeutic modalities to meet these challenges.

Strong Antimicrobial Effects of Xanthohumol and Beta-Acids from Hops against Infection In Vivo.

() is an important causative pathogen of nosocomial gastrointestinal infections in humans with an increasing incidence, morbidity, and mortality. The available treatment options against this pathogen are limited. The standard antibiotics are expensive, can promote emerging resistance, and the recurrence rate of the infection is high.

Inhibitory effect of hop fractions against Gram-positive multi-resistant bacteria. A pilot study.

Aim: Our research focused on the antimicrobial effects of purified hop (Humulus lupulus L.) fractions including α-bitter acids (humulones), β-bitter acids (lupulones) and xanthohumol, and a commercial CO hop extract of bitter acids against reference and multi-resistant strains of Gram-positive and Gram-negative bacteria and against selected yeast strains.

Methods: In vitro testing of antimicrobial activity was performed according to standard testing protocols (EUCAST).

Strong antimicrobial activity of xanthohumol and other derivatives from hops (Humulus lupulus L.) on gut anaerobic bacteria.

Anaerobic bacteria, such as Bacteroides fragilis or Clostridium perfringens, are part of indigenous human flora. However, Clostridium difficile represents also an important causative agent of nosocomial infectious antibiotic-associated diarrhoea. Treatment of C.