Antimicrobial Activity of Grapefruit Seed and Pulp Ethanolic Extract

Acta Pharm. 2004 Sep;54(3):243-50.

Abstract

Antibacterial and antifungal activity of ethanolic extract of grapefruit (Citrus paradisi Macf., Rutaceae) seed and pulp was examined against 20 bacterial and 10 yeast strains. The level of antimicrobial effects was established using an in vitro agar assay and standard broth dilution susceptibility test. The contents of 3.92% of total polyphenols and 0.11% of flavonoids were determined spectrometrically in crude ethanolic extract. The presence of flavanones naringin and hesperidin in the extract was confirmed by TLC analysis. Ethanolic extract exibited the strongest antimicrobial effect against Salmonella enteritidis (MIC 2.06%, m/V). Other tested bacteria and yeasts were sensitive to extract concentrations ranging from 4.13% to 16.50% (m/V).

Publication types

  • Comparative Study

MeSH terms

  • Anti-Infective Agents / chemistry
  • Anti-Infective Agents / pharmacology*
  • Bacteria / drug effects
  • Chemistry, Pharmaceutical / methods
  • Citrus paradisi / chemistry*
  • Ethanol / chemistry
  • Flavonoids / chemistry
  • Flavonoids / isolation & purification
  • Microbial Sensitivity Tests / methods
  • Phenols / chemistry
  • Phenols / isolation & purification
  • Plant Extracts / chemistry*
  • Plant Extracts / pharmacology*
  • Polyphenols
  • Seeds / chemistry*
  • Solvents / chemistry
  • Technology, Pharmaceutical / methods
  • Yeasts / drug effects

Substances

  • Anti-Infective Agents
  • Flavonoids
  • Phenols
  • Plant Extracts
  • Polyphenols
  • Solvents
  • Ethanol