title: Natural variability of essential oil and antioxidants in the medicinal plant Turnera diffusa.
abstract: OBJECTIVE
  To evaluate differences in yield and composition of the essential oil and antioxidant contents in Turnera diffusa plants from localities in central region of Tamaulipas.
  
  
  METHODS
  Samples were collected in Tamaulipas, Mexico in the arid zone. Essential oil was obtained through steam distillation and analyzed using GC-MS. Polyphenol contents, antioxidant activities using ABTS and ferric reducing antioxidant power (FRAP) methods also were evaluated.
  
  
  RESULTS
  A total of 21 compounds were identified in the essential oils; nevertheless, only Eucalyptol, 1,4-Methanocycloocta[d]pyridazine, 1,4,4a,5,6,9,10,10a-octahydro-11,11-dimethyl-, (1à,4à,4aà,10aà) y Ethanone, 1-(1,3-dimethyl-3-cyclohexen-1-yl) were detected in the three sites. Highest contents were registered in the sample from Padrón y Juárez with phenolic content of 33.85 mg GAE/g of dry material and antioxidant activities with ABTS 72.32% and with FRAP 21.33 mg GAE/g of dry material. Statistical differences were observed in essential oil, phenolics and antioxidants contents between populations.
  
  
  CONCLUSIONS
  Results suggest that climatic differences and origin influence the phytochemicals in the medicinal plant Turnera diffusa, and thus, it is worth to consider such effects for industrial and medicinal purposes.
authors.affiliation: Universidad Autónoma de Tamaulipas, Instituto de Ecología Aplicada, División del Golfo 356, Col. Libertad, 87019, Ciudad Victoria, Tamaulipas, Mexico.
authors.forename: Ana Lucía
authors.initials: AL
authors.lastname: Urbizu-González
authors.affiliation: Universidad Autónoma de Tamaulipas, Unidad Académica Multidisciplinaria Reynosa Aztlán, Calle 16 y Lago de Chápala s/n Col. Aztlán, C.P. 88740, Reynosa, Tamaulipas, Mexico.
authors.forename: Octelina
authors.initials: O
authors.lastname: Castillo-Ruiz
authors.affiliation: Universidad Autónoma de Nuevo León, Facultad de Agronomía, Francisco Villa s/n. Col. Ex Hacienda El Canadá, 66050, General Escobedo, Nuevo León, Mexico.
authors.forename: Guillermo Cristian Guadalupe
authors.initials: GC
authors.lastname: Martínez-Ávila
authors.affiliation: Universidad Autónoma de Tamaulipas, Instituto de Ecología Aplicada, División del Golfo 356, Col. Libertad, 87019, Ciudad Victoria, Tamaulipas, Mexico. Electronic address: jorgearieltorres@hotmail.com.
authors.forename: Jorge Ariel
authors.initials: JA
authors.lastname: Torres-Castillo
keywords: Antioxidants; Chemical variation; Essential oil; Phytochemicals