2 research outputs found

    Wheat germ oil extracted by supercritical carbon dioxide with ethanol: Fatty acid composition

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    In this work, supercritical fluid extraction (SFE) using CO<sub>2</sub> with ethanol as entrainer was performed at a temperature of 40 oC under a pressure of 21 MPa. For comparison, a similar extraction without the entrainer was carried out. The extraction yield of wheat germ using supercritical CO<sub>2</sub> with ethanol was slightly higher (10.7 wt%) than that of extraction without the entrainer (9.9 wt%). Fractions of SFE extracts were collected separately during the experiments and the composition of fatty acids in each fraction was analyzed. The SFE extracted oils were rich (63.4-71.3%) in the most valuable polyunsaturated fatty acids (PUFA) and their content in all collected fractions was approximately constant. Similar PUFA contents were found in the reference samples of oils extracted by n-hexane (66.2-67.0%), while the commercial cold-pressed oil contained significantly less PUFA (60.2%). These results show a higher nutritional value of the oil obtained by extraction with supercritical CO<sub>2</sub> than cold pressed oil which is generally considered to be very valuable.<br><br>En este trabajo, la extracci贸n con fluidos supercr铆ticos (SFE) usando CO<sub>2</sub> con etanol como agente de arrastre se realiz贸 a 40 掳C bajo una presi贸n de 21 MPa. Se ha llevado a cabo la comparaci贸n con una extracci贸n similar sin agente de arrastre. El rendimiento de la extracci贸n de germen de trigo usando CO<sub>2</sub> supercr铆tico con etanol fue ligeramente mayor (10,7% en peso) que la de extracci贸n sin agente de arrastre (9,9% en peso). Se recogieron por separado fracciones de extractos SFE durante los experimentos y se analiz贸 la composici贸n de 谩cidos grasos en cada fracci贸n. Los aceites extra铆dos mediante SFE eran ricos en los 谩cidos grasos poliinsaturados m谩s valiosos (63,4-71,3%), (PUFA) y su contenido en todas las fracciones recogidas fue aproximadamente constante. Un contenido similar de PUFA fueron encontrados en muestras de referencia de los aceites extra铆dos con n-hexano (66,2-67,0%), mientras que el aceite prensado en fr铆o comercial conten铆a significativamente menos PUFA (60,2%). Estos resultados muestran un mayor valor nutritivo del aceite obtenido por extracci贸n con CO<sub>2</sub> supercr铆tico que el aceite prensado en fr铆o que generalmente se considera que es muy valioso

    Aceite de germen de trigo obtenido mediante extracci贸n con di贸xido de carbono supercr铆tico con etanol: Composici贸n en 谩cidos grasos

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    In this work, supercritical fluid extraction (SFE) using CO2 with ethanol as entrainer was performed at a temperature of 40 oC under a pressure of 21 MPa. For comparison, a similar extraction without the entrainer was carried out. The extraction yield of wheat germ using supercritical CO2 with ethanol was slightly higher (10.7 wt%) than that of extraction without the entrainer (9.9 wt%). Fractions of SFE extracts were collected separately during the experiments and the composition of fatty acids in each fraction was analyzed. The SFE extracted oils were rich (63.4-71.3%) in the most valuable polyunsaturated fatty acids (PUFA) and their content in all collected fractions was approximately constant. Similar PUFA contents were found in the reference samples of oils extracted by n-hexane (66.2-67.0%), while the commercial cold-pressed oil contained significantly less PUFA (60.2%). These results show a higher nutritional value of the oil obtained by extraction with supercritical CO2 than cold pressed oil which is generally considered to be very valuable.En este trabajo, la extracci贸n con fluidos supercr铆ticos (SFE) usando CO2 con etanol como agente de arrastre se realiz贸 a 40 掳C bajo una presi贸n de 21 MPa. Se ha llevado a cabo la comparaci贸n con una extracci贸n similar sin agente de arrastre. El rendimiento de la extracci贸n de germen de trigo usando CO2 supercr铆tico con etanol fue ligeramente mayor (10,7% en peso) que la de extracci贸n sin agente de arrastre (9,9% en peso). Se recogieron por separado fracciones de extractos SFE durante los experimentos y se analiz贸 la composici贸n de 谩cidos grasos en cada fracci贸n. Los aceites extra铆dos mediante SFE eran ricos en los 谩cidos grasos poliinsaturados m谩s valiosos (63,4-71,3%), (PUFA) y su contenido en todas las fracciones recogidas fue aproximadamente constante. Un contenido similar de PUFA fueron encontrados en muestras de referencia de los aceites extra铆dos con n-hexano (66,2-67,0%), mientras que el aceite prensado en fr铆o comercial conten铆a significativamente menos PUFA (60,2%). Estos resultados muestran un mayor valor nutritivo del aceite obtenido por extracci贸n con CO2 supercr铆tico que el aceite prensado en fr铆o que generalmente se considera que es muy valioso
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