Inhibition of adherence of multi-drug resistant E. coli by proanthocyanidin


Proanthocyanidin is commonly used for inhibiting urinary tract infection (UTI) of sensitive strains of Escherichia coli. The aim of this study was to investigate the effect of proanthocyanidin on adherence of uropathogenic multi-drug resistant E. coli to uroepithelial cells, which has not yet been investigated so far. Extracts of the purified proanthocyanidin were prepared from dried cranberry juice. Purity and structural assignment of proanthocyanidin was assessed using high performance liquid chromatography and 13C nuclear magnetic resonance spectroscopy, respectively. Subsequently, its affect on multi-drug resistant bacteria as well as quantification of anti-adherence bioactivity on human vaginal and bladder epithelial cells was appraised. Inhibition of adherence to an extent of about 70% with multi-drug resistant E. coli strains was observed on uroepithelial cell. The anti-adherence bioactivity of the proanthocyanidin was detected at concentrations of 10–50 µg/ml with significant bacteriuria. Probable proanthocyanidin through A-type linkages either combines to P-fimbriae of bacterial cells or modifies the structural entity of P-fimbriae and inhibits bacterial adherence to uroepithelial cells. The proanthocyanidin exhibited anti-adherence property with multi-drug resistant strains of uropathogenic P-fimbriated E. coli with in vitro study. Hence proanthocyanidin may be considered as an inhibitory agent for multi-drug resistant strains of E. coli adherence to uroepithelial cells.

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Nuclear magnetic resonance


High performance liquid chromatography


Red blood cells

E. coli :

Escherichia coli


Vaginal epithelial cells


Bladder epithelial cells




Colonization factor agar


Amoxicillin–Clavulanic Acid


Urinary tract infection


Phosphate buffer saline solution


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We gratefully acknowledge the financial support from the Department of Science and Technology and council of scientific and industrial research, New Delhi, India.

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Correspondence to Ashish Gupta.

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Gupta, A., Dwivedi, M., Mahdi, A.A. et al. Inhibition of adherence of multi-drug resistant E. coli by proanthocyanidin. Urol Res 40, 143–150 (2012).

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  • Proanthocyanidin
  • Bacterial adherence
  • Multi-drug resistance E. coli