Symposium « Les lipides de Plantes »

Poster (2001, July 10)

The heme synthesis is limiting factor in the expression of recombinant cytochrome P 450 hydroperoxide lyase in Escherichia coli

Poster (2001, June 06)

Study of divinyl ether synthase in potato tubers (Solanum tuberosum L.)

Poster (2001, April 18)

Modelling migration from high-density polyethylene containers into concentrated solutions used as food flavourings

in Food Additives & Contaminants (2001), 18(11), 1040-1045

Migration from high-density polyethylene into different liquids (hexane, ethanol, lemon terpenes and their emulsions) was modelled using the response surfaces method. Polynomial equations (z = A + Bx + Cy ... [more ▼]

Migration from high-density polyethylene into different liquids (hexane, ethanol, lemon terpenes and their emulsions) was modelled using the response surfaces method. Polynomial equations (z = A + Bx + Cy + Dx(2) + Ey(2) + Fxy) were established and parameters determined for each compound. Correlation coefficients were generally > 90%. Analysis indicated that 2,4-bis(1,1-dimethylethyl) phenol, probably due to the degradation of the antioxidant additive tris(2,4- bis(1,1-dimethylethyl) phenyl) phosphite, migrated into each liquid tested, whatever the temperature. Oligomers (10-30 carbons) terminated by a vinyl group were also detected. [less ▲]

The Homolytic And Heterolytic Fatty Acid Hydroperoxide Lyase-Like Activities Of Hematin

in Biochemical and Biophysical Research Communications (2001), 286(1),

Pentenols and pentene dimers are biosynthetized in plants by homolytic fatty acid hydroperoxide lyase (HPL) or HPL-like enzymes. It has been found that these compounds can modify the flavor of olive oil ... [more ▼]

Pentenols and pentene dimers are biosynthetized in plants by homolytic fatty acid hydroperoxide lyase (HPL) or HPL-like enzymes. It has been found that these compounds can modify the flavor of olive oil. Reactions between hematin and 13-hydroperoxyoctadecatrienoic acid resulted in the formation of the same compounds via a free radical reaction in which an alkoxyl radical derived from linolenic acid hydroperoxide undergoes a β-scission. (Z)-3-Hexenal has also been detected as a minor product of the reaction. It is bioconversed from the same substrate in plants by heterolytic HPL. Thanks to the redox cycle of its central iron, hematin has both homolytic and heterolytic HPL-like activities. [less ▲]

Mechanical properties of spread films from Acacia gums (Acacia senegale and Acacia seyal)

Poster (2000, June 07)

Potato tubers exhibit both homolytic and heterolytic hydroperoxide fatty acid-cleaving activities

in Biochemical Society Transactions (2000), 28(6), 853-855

Revue bibliographique : l’hydroperoxyde lyase

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2000), 4(3), 157-167

The hydroperoxide lyase belongs to the lipoxygenase pathway, pathway in which polyunsaturated fatty acids are transformed into a large spectrum of compounds with various chemical and biological functions ... [more ▼]

The hydroperoxide lyase belongs to the lipoxygenase pathway, pathway in which polyunsaturated fatty acids are transformed into a large spectrum of compounds with various chemical and biological functions. The hydroperoxide lyase acts on fatty acids hydroperoxides (mainly linoleic and linolenic). It cleaves the bond between carbon carrying the hydroperoxide function and a vicinal carbon giving an w-oxo-acid and also depending on the species, an aldehyde, a hydrocarbon or an alcohol. [less ▲]

Conversion of green note aldehydes into alcohols by yeast alcohol dehydrogenase

Poster (1999, July 11)

Control of Dioscorea alata microtubers dormancy and germination by jasmonic acid

in Plant Growth Regulation (1999), 27(2), 113-117

Effects of appling exogenous jasmonic acid (JA) on the germination of Dioscorea alata L. microtubers were examined on Murashige and Skoog (MS) medium. Microtuber germination was promoted by JA (0.1 and 1 ... [more ▼]

Effects of appling exogenous jasmonic acid (JA) on the germination of Dioscorea alata L. microtubers were examined on Murashige and Skoog (MS) medium. Microtuber germination was promoted by JA (0.1 and 1 µM) supplemented to the culture medium but higher concentrations (30 and 100 µM) completely inhibited germination. When these inhibited microtubers were transferred to hormone-free medium, germination resumed. After transfer to greenhouse conditions, almost all plants (95%) from tubers previously cultivated on MS medium with 100 µM JA survived and all acclimatized plants had produced tubers after 8 months. It is concluded that depending on JA concentration, both the germination and dormancy processes in D. alata microtubers were affected. The release from dormancy is easily obtained by transferring dormant microtubers to hormone-free medium. [less ▲]