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Zanthoxylum piperitum (Rutaceae) is used as a spice and a natural medicine in Japan. Our study found that ZP-CT-A, a polymeric proanthocyanidin purified from the fruit of this species, noticeably decreased the minimum inhibitory concentrations of beta-lactam antibiotics for methicillin-resistant Staphylococcus aureus (MRSA). The structure of ZP-CT-A was characterized on the basis of (13)C NMR and size exclusion chromatographic data and the results of thiolytic degradation. A mechanistic study of the effects of ZP-CT-A indicated that it suppressed the activity of beta-lactamase and largely decreased the stability of the bacterial cell membrane of MRSA, as shown by a reduction in the tolerance of MRSA to low osmotic pressure and high ionic strength solutions.

bioscience, biotechnology, and biochemistry

Polyphenolic Constituent Structures of<i>Zanthoxylum piperitum</i>Fruit and the Antibacterial Effects of Its Polymeric Procyanidin on Methicillin-Resistant<i>Staphylococcus aureus</i>

Polyphenolic Constituent Structures ofZanthoxylum piperitumFruit and the Antibacterial Effects of Its Polymeric Procyanidin on Methicillin-ResistantStaphylococcus aureus