La composición en hidrocarburos lineales saturados del aceite de la pulpa de aguacate (variedad Hass) se ha analizado. Tres muestras han sido recolectadas: el 3 de marzo 2003, el 18 de marzo 2003 y el 2 de abril 2003. La separación de los hidrocarburos lineales saturados se ha realizado mediante fraccionamiento del insaponificable por cromatografía gravimétrica de adsorción en columna y la determinación de los mismos hidrocarburos por cromatografía gaseosa. 14 compuestos fueron detectados del n-C21 al n-C34. El n-C24 es el mayoritario, seguido del n-C25 y el n-C23. El porcentaje de n-C21, n-C22, n-C23, n-C27 y n-C28, aumentó durante la maduración, en vez el porcentaje de n-C24, n-C25, n-C26, n-C29, n-C30 y C34 disminuyó desde el 3 de marzo 2003 hasta el 2 de abril 2003. Mientras que los hidrocarburos lineales saturados con número impar de carbono aumentan (52.38%, 52.85% y 53.06% por las tres muestras respectivamente) así mismo, hidrocarburos lineales saturados con número par de carbono disminuyen (47.62%, 47.15% y 46.94%). El contenido total en hidrocarburos lineales saturados disminuyó durante la maduración desde 25.20 mg/kg (3 de marzo 2003) hasta 16.77 mg/kg (2 de abril 2003). Para reducir el contenido total en hidrocarburos lineales saturados en el aceite de aguacate (variedad Hass) es necesario retardar la cosecha del fruto.
n-Alkane composition of Avocado pulp oil (cv. Hass) was investigated during fruit ripening. Three samples of fruit were harvested on 3 March 2003, 18 March 2003 and 2 April 2003. Glass gravity column chromatography was employed to separate n-alkanes from other minor components contained in the unsaponifiable fraction.Gas chromatography was used to analyze the eluate. Fourteen compounds were detected ranging from n-C21 to n-C34; mainly n-C24, followed by n-C25 and then by n-C23. Quantities of n-C21, n-C22, n-C23, n-C27 and n-C28 progressively increased during ripening, whereas n-C24, n-C25, n-C26, n-C29, n-C30 and n-C34 decreased from first harvest date to third harvest date. While odd-numbered carbon n-alkanes increased (52.38%, 52.85% and 53.06% for the three samples respectively), even-numbered carbon n-alkanes decreased as the fruit ripened (47.62%, 47.15% and 46.94%). The total n-alkane content decreased during ripening, from 25.20 mg/Kg (first harvest date) to 16.77 mg/Kg (third harvest date). In order to minimize the n-alkane content in the avocado pulp oil it is necessary to delay the fruit harvest date.
Changes in the n-alkane composition of avocado pulp oil (Persea americana, Miller) during fruit ripening / Giuffre', Angelo Maria. - In: GRASAS Y ACEITES. - ISSN 0017-3495. - 56:4(2005), pp. 75-78.
Changes in the n-alkane composition of avocado pulp oil (Persea americana, Miller) during fruit ripening
Giuffrè Angelo Maria
2005-01-01
Abstract
n-Alkane composition of Avocado pulp oil (cv. Hass) was investigated during fruit ripening. Three samples of fruit were harvested on 3 March 2003, 18 March 2003 and 2 April 2003. Glass gravity column chromatography was employed to separate n-alkanes from other minor components contained in the unsaponifiable fraction.Gas chromatography was used to analyze the eluate. Fourteen compounds were detected ranging from n-C21 to n-C34; mainly n-C24, followed by n-C25 and then by n-C23. Quantities of n-C21, n-C22, n-C23, n-C27 and n-C28 progressively increased during ripening, whereas n-C24, n-C25, n-C26, n-C29, n-C30 and n-C34 decreased from first harvest date to third harvest date. While odd-numbered carbon n-alkanes increased (52.38%, 52.85% and 53.06% for the three samples respectively), even-numbered carbon n-alkanes decreased as the fruit ripened (47.62%, 47.15% and 46.94%). The total n-alkane content decreased during ripening, from 25.20 mg/Kg (first harvest date) to 16.77 mg/Kg (third harvest date). In order to minimize the n-alkane content in the avocado pulp oil it is necessary to delay the fruit harvest date.File | Dimensione | Formato | |
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