Abstract
Thermal analysis comprises a group of techniques to measure a physical property of a sample subjected to controlled temperature programming, including thermogravimetry (TGA), derivative thermogravimetry (DTG) and differential scanning calorimetry (DSC). The species Aniba duckei Kostermans, synonymous with Aniba rosaeodora Ducke, occurs in the Amazon and is also known as rosewood. Essential oils are complex oily aromatic liquids obtained by extraction from highly volatile aromatic plant materials as secondary metabolites. This research aimed to chemically and thermally characterize the essential oil of Aniba duckei. Gas chromatography was used for the quantification, by the external standard method, of the main component. The thermal study of the oil and the linalool standard was carried out using DSC and TG-DTG. The essential oil yield was 1.93% and the analysis by GC-MS confirmed the majority presence of linalool, with a concentration of 89.34% in the oil. The technical analysis revealed some similarity between the curves of pure linalool and essential oil, which is attributed to the high content of linalool in the oil. The differences between the boiling points and enthalpies of the linalool and oil pattern are justified by the presence of minor components, their concentrations in the oil and because they are substances of different polarities, molecular masses and intermolecular forces. The techniques proved to be efficient to characterize the oil. The results of the thermal analysis of the essential oil of the Aniba rosaeodora plant species are unprecedented, enabling the determination of linalool in by DSC.
Highlights
Essencial oils Brazilian biodiversity is one of the richest on the planet, with a high rate of biological endemism, dispersed in unique biomes (Maia et al, 2009; Barata, 2012; Joly et al, 2011)
This research was developed in the Laboratory of Fuels and Materials (LACOM) located at Federal University of Paraiba (UFPB) in partnership with Laboratory of Researches and Tests of Fuels (LAPEC) at Federal University of Amazonas (UFAM) and Sao Carlos Institute of Chemistry, from University of Sao Paulo (USP)
The substances identified from the chromatogram of the essential oil of Aniba rosaeodora Ducke showed that the major component is linalool, with 89.34%, which is in agreement with the literature
Summary
Essencial oils Brazilian biodiversity is one of the richest on the planet, with a high rate of biological endemism, dispersed in unique biomes (Maia et al, 2009; Barata, 2012; Joly et al, 2011). They produce certain chemicals called secondary metabolites, which are used as an attack and defense mechanism (Nazir et al, 2021). Among these secondary metabolites are essential oils, which are volatile, lipophilic, odorous and liquid products extracted from different parts of aromatic plants, which have different and complex chemical composition and guarantee adaptive advantages to the plants in the environment in which they are inserted (Oussalah et al, 2007; Hasani et al, 2018; Tuğçe et al, 2021). Essential oils from various plant species are used in perfumery, cosmetics, food and as adjuvants in medicines, being considered important in commercial and monetary aspects (Bizzo et al, 2009; Kreutz et al, 2021)
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