  Intersterification of rapessed oil with anhydrous milk fat and its stearin fraciton. I. Modifications of compositionAguedo, Mario  ; Giet, Jean-Michel ; Hanon, Emilien et alin GCIRC Bulletin (2009), 25 Milk fat in human diet is associated with cardiovascular diseases due to its high content in saturated fatty acids and cholesterol. Most vegetable oils are much healthier as they are rich in unsaturated ... [more ▼] Milk fat in human diet is associated with cardiovascular diseases due to its high content in saturated fatty acids and cholesterol. Most vegetable oils are much healthier as they are rich in unsaturated fatty acids (1,2). Lipase-catalysed interesterification of oils and fats has arisen as an alternative to hydrogenation or chemical processes to produce margarine and shortenings (3), notably because they do not give rise to undesirable trans fatty acids (4). The enzyme exchanges fatty acids from one triglyceride to another, resulting in a redistribution of fatty acids species. For such a reaction, the lipase of Thermomyces lanuginosa was shown to be an efficient tool in solvent-free fat blends batches and micro-aqueous conditions (5). Enzymatic interesterification can thus be used to enrich “hard” fats with unsaturated fatty acids (6,7). As an illustration, rapeseed oil (RO) (a choice source of unsaturation-rich residues) was used in the present study to enrich anhydrous milk fat (AMF) with unsaturated C18 fatty acids (FA) (oleic, linoleic and linolenic acids). Comparatively, one “harder” fraction of AMF underwent the same reaction. The physico-chemical properties modifications induced by the reaction were followed. The compositional changes are reported in this first part and the consequent physical modifications are presented in a second part. [less ▲] Detailed reference viewed: 118 (44 ULg)Differences in glucosinolate degradation products related to aphid and Brassicaceae host plant myrosinasesFrancis, Frédéric ; Wathelet, Jean-Paul ; Lognay, Georges in GCIRC Bulletin (2001) Studies on chemical ecology of host plant selection by herbivores were largely carried out to orplain the diversity of secondary plant chemicals and host specialisation of herbivores. The glucosinolate ... [more ▼] Studies on chemical ecology of host plant selection by herbivores were largely carried out to orplain the diversity of secondary plant chemicals and host specialisation of herbivores. The glucosinolate - isothiocyanate system in Brassicaceae plants was considered as a plant defence and was known to influence the feeding behaviour of phytophagous insects such as the cabbage aphid, Brevicoryre brassicae. Purified m5nosinases from the latter and from white mustard, Sinqis alba, were used to hydrolyse two glucosinolate compounds. Identification of the degradation products, mainly isothiocyanates, was perficrmed by gas chromatography - mass spectromeûy. While sinigdn hydrolysis gave identical isothiocyanates for insect and plant enzymes, B. brassicae myrosinase showed a particular activity toward sinalbin A lost of an hydrory group was obsen'red for the two latter substrates related products when compared to the S. alba enzymatic specificity. Aphid and plant myrosinases have different properties and specificities which can be discussed in relation to a co-evolution approach. [less ▲] Detailed reference viewed: 38 (7 ULg)Effect of feeding lambs with fat rapessed meal on the quality of their depot fat.Wathelet, Jean-Paul ; ; in GCIRC Bulletin (1999) Detailed reference viewed: 5 (0 ULg)Production et utilisation du colza en Belgique.; ; Wathelet, Jean-Paul in GCIRC Bulletin (1991) Detailed reference viewed: 19 (2 ULg)Determination of total glucosinolate in rapeseed (colza). Activities of BCR-programme Community Bureau of Reference .Wathelet, Jean-Paul ; ; in GCIRC Bulletin (1990) Detailed reference viewed: 19 (1 ULg)Le renouveau de colza d'hiver en Belgique.; ; Wathelet, Jean-Paul in GCIRC Bulletin (1989) Detailed reference viewed: 12 (1 ULg) |
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