Photoacoustic technique applied to thermo-optical characterization of citrus essential oils


G. López Muñoz1, R. López González 2 and J. Balderas López3

1Unidad Profesional Interdisciplinaria en Ingeniería y Tecnologías Avanzadas UPIITA-IPN, México
2Química Aromática S.A. México
3Unidad Profesional Interdisciplinaria en Biotecnología UPIIBI-IPN, México

Keywords: photoacoustic
property: thermal diffusivity; optical absorption coefficient
material: citrus essential oils

Essential oils are complex mixtures of chemical substances which give their characteristic flavours and fragrances to plants and fruits. The most used in industry are obtained as by-product of citrus juice processing [1]. Although in natural way are used for flavours and fragrances their use is not restricted to this applications since several studies have proved their potential for medical applications as anti-microbial and anti-plasmid substances [2-4]. Their potential therapeutic application makes important the study of their thermo-optical properties and their relation with the matter and energy transfer originated by the transport phenomenons associated with drugs absorption. A photoacoustic methodology was used for thermal diffusivity and optical absorption coefficient measurement in various essential oils obtained from Mexican citrus fruits [5]. The samples consisted on essential oils obtained by centrifugation of orange (Citrus sinensis), pink grapefruit (Citrus paradisi), mandarin (Citrus reticulata blanco var. mandarin), and lime (Citrus aurantifolia) the last one also obtained by steam distillation. Even though the results don’t show meaningful differences between thermal diffusivity values for the diverse essential oils obtained by centrifugation they do it between the samples obtained by two different obtention mechanisms (centrifugation and steam distillation). In the other hand the optical absorption coefficients values obtained at a 405nm wavelength for the diverse samples show meaningful differences between essential oils; although there is remarkable difference between distilled and centrifuged essential oils.

References
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  5. J. A. Balderas-López, A. Mandelis, Rev. Sci. Instrum. 74, 700 (2003)

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