Chemical and structural variations in hazelnut and soybean oils after ozone treatments

H. Uzun; E. G. Kaynak; E. Ibanoglu; S. Ibanoglu

doi:10.3989/gya.1098171

Autores/as

H. Uzun Gaziantep University, Department of Food Engineering https://orcid.org/0000-0003-1098-3197
E. G. Kaynak Gaziantep University, Department of Food Engineering https://orcid.org/0000-0003-1805-1984
E. Ibanoglu Gaziantep University, Department of Food Engineering https://orcid.org/0000-0003-2665-7919
S. Ibanoglu Gaziantep University, Department of Food Engineering https://orcid.org/0000-0002-0727-4747

DOI:

https://doi.org/10.3989/gya.1098171

Palabras clave:

Aceite de avellana, Aceite de soja, FTIR, GC, NMR, Ozono, Viscosidad

Resumen

En el presente trabajo se investigó el efecto de tratamientos con ozono sobre las propiedades estructurales de aceites de soja (SBO) y avellana (HO). El estudio muestra hallazgos y resultados sobre la oxidación de HO y SBO con ozono que no se habían presentado previamente. Los aceites HO y SBO son tratados con ozono gaseoso durante 1, 5, 15, 30, 60, 180 y 360 min. La reactividad del ozono con SBO y HO durante el tratamiento se analizó mediante ¹H, ¹³C NMR, FTIR y GC. Se midieron las variables: índice de yodo, viscosidad y color (L *, a * y b *) de los aceites no tratados y tratados con ozono. Los productos de reacción se identificaron de acuerdo con el mecanismo de Criegee. Se asignaron nuevas señales a 5,15 y 104,35 ppm a los anillos protónicos de 1,2,4-trioxolano (ozónido secundario) en aceites ozonizados en ¹H y ¹³C RMN, respectivamente. Los aceites ozonizados también mostraron picos a 9,75 y 2,43 ppm en ¹H NMR correspondientes al protón aldehídico y al grupo α-metileno, respectivamente. El pico a 43,9 ppm en ¹³C RMN se relacionó con el C carbonilo del grupo α-metileno. Las nuevas señales formadas en el proceso de ozonización aumentaron gradualmente con respecto al tiempo de tratamiento con ozono. Después de un tratamiento de 360 minutos con ozono, la señal del doble enlace C=C que pertenece a los ácidos grasos insaturados desapareció por completo en el espectro. Se observó un aumento en la viscosidad, una disminución en el índice de yodo, una reducción drástica en b* de muestras de aceite en el eje (+) con el aumento del tiempo de tratamiento con ozono.

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Citas

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