title: Determination of the phytoalexin resveratrol (3,5,4'-trihydroxystilbene) in peanuts and pistachios by high-performance liquid chromatographic diode array (HPLC-DAD) and gas chromatography-mass spectrometry (GC-MS).
abstract: The phytoalexin resveratrol (3,5,4'-trihydroxystilbene) in edible peanut (Arachis hypogaea L.) and pistachio (Pistacia vera L.) varieties grown in Turkey was analyzed by high-performance liquid chromatographic diode array and gas chromatography-mass spectrometric detection. trans-Resveratrol in six peanut varieties, five pistachio varieties, and four market samples ranged between 0.03 and 1.92 microg/g. The Cerezlik 5025 peanut (1.92 +/- 0.01 microg/g) and Ohadi pistachio genotype (1.67 +/- 0.01 microg/g) had significantly higher trans-resveratrol contents. Peanuts contained 0.03-1.92 microg/g (av = 0.84 microg/g) of trans-resveratrol, whereas pistachio contained 0.09-1.67 microg/g (av = 1.15 microg/g). With exposure to UV light for 1 min, trans-resveratrol concentrations of samples ranged from 0.02 to 1.47 microg/g and those of cis-resveratrol from 0.008 to 0.32 microg/g. The occurrence of resveratrol in peanut and pistachio was confirmed by total ion chromatograms (TIC) of bis[trimethylsilyl]trifluoroacetamide derivatives of resveratrol isomers and comparison of the mass spectral fragmentation data with those of a resveratrol standard. Formation of the cis-isomer in pistachios was higher than in peanuts.
authors.affiliation: Celal Bayar University, Akhisar M.Y.O., 45200 Akhisar, Manisa, Turkey.
authors.forename: Ozlem
authors.initials: O
authors.lastname: Tokuşoglu
authors.forename: Mustafa Kemal
authors.initials: MK
authors.lastname: Unal
authors.forename: Fadim
authors.initials: F
authors.lastname: Yemiş
mesh_terms: D010367:Arachis / Q000737:chemistry* / Q000235:genetics; D002851:Chromatography, High Pressure Liquid; D008401:Gas Chromatography-Mass Spectrometry; D005838:Genotype; D027927:Pistacia / Q000737:chemistry* / Q000235:genetics; D010936:Plant Extracts / Q000032:analysis*; D000077185:Resveratrol; D012639:Seeds / Q000737:chemistry*; D012717:Sesquiterpenes; D013267:Stilbenes / Q000032:analysis*; D013729:Terpenes; D000094162:Phytoalexins
chemical_list: D010936:Plant Extracts; D012717:Sesquiterpenes; D013267:Stilbenes; D013729:Terpenes; D000077185:Resveratrol; D000094162:Phytoalexins