Available online at cienceDirect C. R. Chimie 12 (2009) 895 e 904 Full paper / Me ′ moire Chemical changes in virgin olive oils asa function of crushing systems: Stone mill and hammer crusher Se′ bastien Veillet a, Vale ′ rie Tomao a,*, Isabelle Bornard b, Karine Ruiz a, Farid Chemat a a UMR A408 Se ′ curite ′ et qualite ′ des produits d’ origine ve′ ge ′ tale, INRA, Universite ′d’ Avignon, 84000 Avignon, France b INRA e Unite ′ de pathologie ve′ ge ′ tale, domaine St Maurice, 84143 Montfavet, France Received 3 June 2008; accepted after revision 19 January 2009 Available online 21 March 2009 Abstract Olive oils were tested for their position in polyphenols, free fatty acids and pounds asa function of the crushing systems, . the stone mill and hammer crusher. The qualitative and quantitative HPLC/DAD analyses of the olive oils showed that luteolin and tyrosol were the most abundant identified pounds. The olive oil obtained by the hammer crusher had the highest concentration of pounds and ultimately the strongest antioxidant activity. Olives treated by the two crushing systems were observed by scanning electronic microscopy. Micrographs provide more evidence of the better cell cuts of olive fruits treated by hammer crushing, in contrast to stone mill where olive cell layers have been broken and damaged. To cite this article: S. Veillet et al., C. R. Chimie 12 (2009). _ 2009 A
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