Discrimination of varietal olive oils of the portuguese cultivars Cobrançosa, M...

• Author(s): Pereira, J.A. ; Oliveira, M.B.P.P. ; Casal, Susana ; Alves, M.R.
• Date: 2002
• Persistent ID: http://hdl.handle.net/10198/859
• Origin: Biblioteca Digital do IPB
• Subject(s): Portuguese cultivars; Varietal olive oil; Fatty acids profile; Discriminant analysis
• Document Type: Article
• Language: English

Description

The fatty acid composition has been traditionally used to discriminate the different vegetable oils and confirm their authenticity. The aim of the present study was to check the possible use of the fatty acid profile to differentiate varietal olive oils of the three most important cultivars in Northeast Portugal (Cobrançosa, Madural and Verdeal). Fifteen varietal olive oils from each of the three cultivars were collected to achieve that goal. Fatty acids were determined, as methylesters, by HRGC. Methylesters were prepared by transesterefication with BF3/methanol after saponification with methanolic KOH. The fatty acid pattern was performed with a Chrompack CP9001 equipped with a split-splitless injector, a FID and a 50m x 0,25 mm i.d. fused silica capillary column coated with a 0.19µm film of CP-Sil88 (Chrompack). The temperatures of injector, detector and oven were 230, 250 and 185ºC, respectively. The results as shown by two-way Anova techniques and discriminant analysis demonstrate that C16:1c, C17:1, C18, C18:1c, C18:2cc and C18:3ccc can be used to discriminate the origin of each of the three olive oils.