title: Phenolic characterization and antimicrobial activity of folk medicinal plant extracts for their applications in olive production.
abstract: Phytophthora spp is important in plant pathology due to the importance of the diseases it causes. In olive trees, severe damages are caused by the disease known as "dry branch" occasioned by Phytophthora nicotianae, P. citrophthora and P. palmivora. Much effort has been made to find efficient methods of control, with a low negative impact on environment. In this regard, treatment with plant extracts is a valid strategy. The aims of the present study are (i) to determine the polyphenol composition of extracts of Thymus vulgaris, Origanum vulgare, Matricaria recutita, and Larrea divaricata by CZE, (ii) correlate the analytical composition of these extracts with the inhibition on the mycelial growth, and (iii) determine the individual antimicrobial activity of the most active ingredients. A simple methodology was developed for the determination of catechin, naringenin, cinnamic acid, syringic acid, chlorogenic acid, apigenin, vanillic acid, luteolin, quercetin, and caffeic acid in plant extracts by CZE. The extraction of phenolic compounds in extract was performed by a miniaturized solid phase extraction using a home-made minicolumn packed with suitable filtering material (C18 , 50 mg). The optimized analyses conditions were: 30 mM boric acid buffer, pH 9.50; capillary, 57 cm full length, 50 cm effective length, 75 μm id, hydrodynamic injection 30 mbar, 2 s; 25 kV; 25°C, detection by UV absorbance at 290 nm. Sample results suggest that phenolic composition seems to have a great influence on inhibition of pathogens. The highest inhibitions of mycelial growth were observed for cinnamic acid and naringenin.
authors.affiliation: Instituto de Biología Agrícola de Mendoza (IBAM-CONICET), Facultad de Ciencias Agrarias, Universidad Nacional de Cuyo, Mendoza, Argentina.
authors.forename: Joana
authors.initials: J
authors.lastname: Boiteux
authors.forename: Carolina
authors.initials: C
authors.lastname: Soto Vargas
authors.forename: Pablo
authors.initials: P
authors.lastname: Pizzuolo
authors.forename: Gabriela
authors.initials: G
authors.lastname: Lucero
authors.forename: María Fernanda
authors.initials: MF
authors.lastname: Silva
mesh_terms: D000890:Anti-Infective Agents / Q000032:analysis* / Q000494:pharmacology; D019075:Electrophoresis, Capillary; D031658:Olea / Q000382:microbiology*; D010636:Phenols / Q000032:analysis*; D010935:Plant Diseases / Q000382:microbiology / Q000517:prevention & control*; D010936:Plant Extracts / Q000032:analysis* / Q000494:pharmacology; D010946:Plants, Medicinal / Q000737:chemistry*; D059808:Polyphenols / Q000032:analysis* / Q000494:pharmacology; D052616:Solid Phase Extraction
chemical_list: D000890:Anti-Infective Agents; D010636:Phenols; D010936:Plant Extracts; D059808:Polyphenols
keywords: Capillary Electrophoresis; Medicinal Plant Extracts; Olive; Phenolic Compounds; Phytophthora