iridoids and protocatechuic-acid

The antimicrobial potential of eight phenolic compounds isolated from olive cake was tested against the growth of Escherichia coli, Klebsiella pneumoniae, Bacillus cereus, Aspergillus flavus and Aspergillus parasiticus. The phenolic compounds included p-hydroxy benzoic, vanillic, caffeic, protocatechuic, syringic, and p-coumaric acids, oleuropein and quercetin. Caffeic and protocatechuic acids (0.3 mg/ml) inhibited the growth of E. coli and K. pneumoniae. The same compounds apart from syringic acid (0.5 mg/ml) completely inhibited the growth of B. cereus. Oleuropein, and p-hydroxy benzoic, vanillic and p-coumaric acids (0.4 mg/ml) completely inhibited the growth of E. coli, K. pneumoniae and B. cereus. Vanillic and caffeic acids (0.2 mg/ml) completely inhibited the growth and aflatoxin production by both A. flavus and A. parasiticus, whereas the complete inhibition of the moulds was attained with 0.3 mg/ml p-hydroxy benzoic, protocatechuic, syringic, and p-coumaric acids and quercetin.

Topics: Aflatoxin B1; Anti-Bacterial Agents; Anti-Infective Agents; Antifungal Agents; Antioxidants; Aspergillus; Aspergillus flavus; Bacillus cereus; Bacteria; Caffeic Acids; Chromatography, High Pressure Liquid; Coumaric Acids; Escherichia coli; Fruit; Gallic Acid; Hydroxybenzoates; Iridoid Glucosides; Iridoids; Klebsiella pneumoniae; Parabens; Phenols; Propionates; Pyrans; Quercetin; Vanillic Acid