lupulone/humulus

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Enabling Heterologous Synthesis of Lupulones in the Yeast Saccharomyces cerevisiae.

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Lupulones, naturally produced by glandular trichomes of hop (Humulus lupulus), are prenylated phloroglucinol derivatives that contribute the bitter flavor of beer and demonstrate antimicrobial and anticancer activities. It is appealing to develop microbial cell factories such that lupulones may be

Antimicrobial activity of lupulone against Clostridium perfringens in the chicken intestinal tract jejunum and caecum.

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OBJECTIVE Owing to the spread of antibiotic resistance among human infectious agents, there is a need to research antibiotic alternatives for use in animal agricultural systems. Antibiotic-free broiler chicken production systems are known to suffer from frequent outbreaks of necrotic enteritis due

Quantification of co-, n-, and ad-lupulone in hop-based dietary supplements and phytopharmaceuticals and modulation of their contents by the extraction method.

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Hop β-bitter acids (lupulones) are health-beneficial components of Humulus lupulus L. showing, for example, antidepressant-like effects in vitro. Despite of the widespread use of hops for medicinal purposes, the concentrations of lupulones in hop-based drugs have not been reported yet. The present

Chicken intestine microbiota following the administration of lupulone, a hop-based antimicrobial.

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The use of antibiotic growth promotants in poultry rearing is a public health concern due to antibiotic resistance in bacteria and the harborage of resistance genes. Lupulone, a hop β-acid from Humulus lupulus, has been considered as a potential feed additive growth promotant. Here, the effect of

Chemopreventive effects of lupulone, a hop {beta}-acid, on human colon cancer-derived metastatic SW620 cells and in a rat model of colon carcinogenesis.

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The bitter acids of hops (Humulus lupulus L.) mainly consist of humulones or alpha-acids and lupulones or beta-acids. We aimed to evaluate the antiproliferative mechanisms of lupulones on a human metastatic colon carcinoma-derived cell line (SW620 cells) and to assess their chemopreventive effects

Antibiofilm activity of bioactive hop compounds humulone, lupulone and xanthohumol toward susceptible and resistant staphylococci.

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Bacterial biofilms pose a serious medical problem due to their significant resistance to antimicrobials, and staphylococci are recognized as the most frequent cause of biofilm-associated infections. The hop plant (Humulus lupulus L.) contains substances that have been determined to act as

Anti-inflammatory and anti-tumor-promoting effects of 5-deprenyllupulonol C and other compounds from Hop (Humulus lupulus L.).

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A new phloroglucinol derivative, 5-deprenyllupulonol C (1), along with four other phloroglucinol derivatives, 2-5, five chalcones, 6-10, four flavanones, 11-14, two flavonol glycosides, 15 and 16, and five triterpenoids, 17-21, were isolated from the female inflorescence pellet extracts of hop

Positive antibacterial co-action between hop (Humulus lupulus) constituents and selected antibiotics.

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The research reported here deals with co-action of the hop (Humulus lupulus)-derived anti-bacterial compounds, lupulone and xanthohumol, with several antibiotics. Among the antibiotics investigated for their co-action, polymyxin B sulfate, tobramycin and ciprofloxacin had a positive co-action in

2-Methyloxolane as a Bio-Based Solvent for Green Extraction of Aromas from Hops (Humulus lupulus L.).

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The potential of using the bio-based solvent 2-methyloxolane, also known as 2-methyltetrahydrofuran or 2-MeTHF, as an alternative to petroleum solvents such as hexane, was investigated for the extraction of volatile compounds from hop cones (Humulus lupulus L.). Lab scale extractions were

Fractionation by SFE and microcolumn analysis of the essential oil and the bitter principles of hops.

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Supercritical fluid extraction (SFE) is evaluated and optimized for the enrichment and fractionation of the essential oil and the bitter principles of hops (Humulus lupulus), both of which contribute to the flavor of beer. Profiles of the essential oil of different hop varieties are compared. The

Inhibition of fructan-fermenting equine faecal bacteria and Streptococcus bovis by hops (Humulus lupulus L.) β-acid.

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OBJECTIVE The goals of this study were to determine if β-acid from hops (Humulus lupulus L.) could be used to control fructan fermentation by equine hindgut micro-organisms, and to verify the antimicrobial mode of action on Streptococcus bovis, which has been implicated in fructan fermentation,

Determination of xanthohumol in hops (Humulus lupulus L.) by nonaqueous CE.

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Xanthohumol (XN) is a prenylated chalcone with antimutagenic and anticancer activity from hops. A nonaqueous reverse polarity capillary electrophoretic method for the determination of XN in hop extract was developed and validated. The optimal parameters were a 64.5 cm long fused-silica capillary

Biotechnological production of hyperforin for pharmaceutical formulation.

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Hyperforin is a major active constituent of Hypericum perforatum (St. John's wort). It has amazing pharmacological activities, such as antidepressant properties, but it is labile and difficult to synthesize. Its sensitivity and lipophilicity are challenges for processing and formulation. Its

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

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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. difficile infection is problematic,

The antimicrobial effects of hops (Humulus lupulus L.) on ruminal hyper ammonia-producing bacteria.

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OBJECTIVE To assess the antimicrobial effects of hops (Humulus lupulus L.) on hyper ammonia producing-bacteria (HAB), which catabolize amino acids and peptides in the bovine rumen. RESULTS When media were amended with dried hops or hops extract (30.7% lupulone), ammonia production by mixed rumen

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