Linseed oil and mixture with maleic anhydride: 1 H and 13 C NMR

Autor:	Arlette Klein, Arlette Solladié-Cavallo, H. Senouci, J. Terrisse, Loïc Jierry, M. Bouquey
Rok vydání:	2003
Předmět:	food.ingredient Linolenic acid General Chemical Engineering Organic Chemistry Maleic anhydride Thermal treatment Carbon-13 NMR Solvent chemistry.chemical_compound food Vegetable oil Linseed oil chemistry Proton NMR Organic chemistry Nuclear chemistry
Zdroj:	Journal of the American Oil Chemists' Society. 80:311-314
ISSN:	0003-021X
DOI:	10.1007/s11746-003-0695-z
Popis:	It was shown that 1H NMR allowed a rapid determination of the ratio of the linolenic residues over all the others (linoleic + oleic + saturated) and 13C NMR allowed a rapid determination of the ratio of linolenic over (linoleic + oleic) residues as well as the linoleic/oleic ratio in a few minutes on less than 20 mg of crude LO. After thermal treatment (220°C for 2 h, followed by cooling to room temperature), a 1∶1 mixture of linseed oil (LO) and maleic anhydride (MA), which was a suspension, became limpid and remained limpid. Moreover, the viscosity of the mixture was higher than that of pure LO treated in the same way. It was shown by 13C NMR and quantitative recovery of the constituents (LO and MA) through solvent separation that no reaction occurred between LO and MA during this thermal treatment. This result is in accord with DSC analysis of such a 1∶1 LO/MA mixture that exhibited an exothermic effect too small (about 34 kcal/mol) to correspond to formation of a C−C bond.
Databáze:	OpenAIRE
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