title: Levels of tannins and flavonoids in medicinal plants: evaluating bioprospecting strategies.
abstract: There are several species of plants used by traditional communities in the Brazilian semiarid. An approach used in the search for natural substances that possess therapeutic value is ethnobotany or ethnopharmacology. Active substances that have phenolic groups in their structure have great pharmacological potential. To establish a quantitative relationship between the species popularly considered to be antimicrobial, antidiabetic, and antidiarrheal, the contents of tannins and flavonoids were determined. The plant selection was based on an ethnobotanical survey conducted in a community located in the municipality of Altinho, northeastern Brazil. For determination of tannin content was utilized the technique of radial diffusion, and for flavonoids, an assay based on the complexation of aluminum chloride. The group of plants with antimicrobial indications showed a higher content of tannins compared to the control groups. The results evidence suggests a possible relationship between these compounds and the observed activity.
authors.affiliation: Natural Products Laboratory, Pharmacy Department, Federal University of Pernambuco, 50670-901 Recife, PE, Brazil.
authors.forename: Clarissa Fernanda de Queiroz
authors.initials: CF
authors.lastname: Siqueira
authors.forename: Daniela Lyra Vasconcelos
authors.initials: DL
authors.lastname: Cabral
authors.forename: Tadeu José da Silva
authors.initials: TJ
authors.lastname: Peixoto Sobrinho
authors.forename: Elba Lúcia Cavalcanti
authors.initials: EL
authors.lastname: de Amorim
authors.forename: Joabe Gomes
authors.initials: JG
authors.lastname: de Melo
authors.forename: Thiago Antônio de Sousa
authors.initials: TA
authors.lastname: Araújo
authors.forename: Ulysses Paulino
authors.initials: UP
authors.lastname: de Albuquerque