title: Application and analysis of the folin ciocalteu method for the determination of the total phenolic content from Limonium brasiliense L.
abstract: Limonium brasiliense is a common plant on the southern coast of Brazil. The roots are traditionally used for treatment of premenstrual syndrome, menstrual disturbances and genito-urinary infections. Pharmaceutical preparations obtained from its roots and used for these purposes were marketed in Brazil in the 1980s and 1990s. Currently, the Brazilian Drug Agency (National Health Surveillance Agency, ANVISA) has canceled the registration of these products, and their use was discontinued because of a lack of studies to characterize the plant raw material and ensure the effectiveness and safety of its use. The aim of the present study was to develop and validate an analytical method to determine the content of total polyphenols (TP) in an extract from L. brasiliense roots, by the UV/Vis spectrophotometric method. L. brasiliense roots were extracted in acetone:water (7:3, v/v-10% w/v). The crude extract was used to develop a method for TP assay. The method was validated according to national and international guidelines. The optimum conditions for analysis time, wavelength, and standard substance were 30 min, 760 nm, and pyrogallol, respectively. Under these conditions, validation by UV/Vis spectrophotometry proved the method to be linear, specific, precise, accurate, reproducible, robust, and easy to perform. This methodology complies with the requirements for analytical application and to ensure the reliability of the results.
authors.affiliation: Programa de Pós Graduação em Ciências Farmacêuticas, Universidade Estadual de Maringá, Av. Colombo 5790, BR-87020-900 Paraná, Brazil.
authors.forename: Andressa
authors.initials: A
authors.lastname: Blainski
authors.forename: Gisely Cristiny
authors.initials: GC
authors.lastname: Lopes
authors.forename: João Carlos Palazzo
authors.initials: JC
authors.lastname: de Mello
mesh_terms: D015394:Molecular Structure; D008982:Molybdenum / Q000737:chemistry; D010636:Phenols / Q000032:analysis* / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry; D018517:Plant Roots / Q000737:chemistry; D029606:Plumbaginaceae / Q000737:chemistry*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D017973:Tungsten Compounds / Q000737:chemistry
chemical_list: C029556:Folin's phenol reagent; D010636:Phenols; D010936:Plant Extracts; D017973:Tungsten Compounds; D008982:Molybdenum