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- W2016644902 abstract "Twenty-six hop bitter resins, some hitherto not investigated, were tested for antimicrobial activities. Gram-positive bacteria were much more sensitive than Gram-negative ones. The inhibitory effect against Bacillus subtilis 168 was measured by several methods and the general rule could be established that the antibiotic properties are mainly dependent on the hydrophobic parts of the molecules. Thus the acyl-lupuphenones (2-acyl-3,5-4,4',6-tri(3-methyl-2-butenyl)-cyclohexane-triones (1, 3, 5) having three prenyl and one acyl side chain are the most active substances. Their minimum inhibitory concentration (MIC) increases from the capro (0.5 muM) to the aceto derivative (11 muM). Any substitution with hydrophilic functions or loss of hydrophobic groups causes reductions in biological activity. This is most evident with the corresponding acyl-phloroglucine precursors (2-acyl-1,3,5-trihydroxybenzenes) which lack the three prenyl side chains (MIC, 110 to 5050 muM respectively). Conversion of the central six-membered ring structure into a five-membered one results in additional losses of antimicrobial activity. These findings support the proposal that the lipophilic region of the cell membrane represents the target site for the hop bitter resins." @default.
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- W2016644902 date "1975-02-01" @default.
- W2016644902 modified "2023-10-10" @default.
- W2016644902 title "Structural features determining the antibiotic potencies of natural and synthetic hop bitter resins, their precursors and derivatives" @default.
- W2016644902 doi "https://doi.org/10.1139/m75-029" @default.
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