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8 pages, 1 figure, 6 tables.[EN] Conventional and high oleic sunflower oils as well as 50%\udmixture of both of them were heated at different temperatures\udunder well-controlled conditions. Total polar compounds, the\udmain groups of polar glycerides, total polar fatty acids, the main\udgroups of polar fatty acids and the loss of initial fatty acids were\udquantitated.\udThe most outstanding results demonstrated the primacy of\udthe formation of glyceridic polymerization compounds during\udheating at high temperatures. After transesterification of the\udsamples dimeric fatty acids was the most significant group of\udcompounds obtained. As expected, linoleic acid was preferentially involved in the formation of polar fatty acids, although the\udparticipation of oleic acid became very important at low\udconcentration of linoleic acid. Finally good statistical figures were\udobtained for the regression of polar fatty acids on polar\udcompounds[ES] Aceites de girasol convencional y alto oleico así como una\udmezcla al 50% de ambos fueron calentados a diferentes temperaturas\udbajo condiciones controladas. Se cuantificaron los compuestos\udpolares totales, los grupos principales de glicéridos, ácidos\udgrasos polares totales, los grupos principales de ácidos\udgrasos polares y la pérdida de ácidos grasos iniciales.\udLos resultados más relevantes demostraron la primacía de la\udformación de compuestos de polimerización glicerídicos durante\udel calentamiento a altas temperaturas. Después de la transesterificación\udde las muestras, los ácidos diméricos constituyeron el\udgrupo más significativo de compuestos obtenidos. Como era\udesperado, el ácido linoleico contribuyó preferentemente en la formación\udde los ácidos grasos polares, si bien la participación del\udácido oleico fue muy importante a bajas concentraciones de\udácido linoleico. Finalmente, se obtuvieron buenos resultados\udestadísticos para la regresión entre ácidos grasos polares y compuestos\udpolares.This study was supported by an EU grant (AIR1\udGT92-0687) and by GICYT (ALI 95-0736). Neuza Jorge\udwas supported by a fellowship from GNPg (Brasil).Peer reviewe

Influence of fatty acid composition on the formation of polar glycerides and polar fatty acids in sunflower oils heated at frying temperatures.