In this paper we characterized samples of vegetable oil inajá (Maximiliana maripa (Aublet) Drude) and urucuri (Attalea phalerata) extracted from fruits harvested, respectively, in the cities of Abaetetuba and Alenquer. The samples were first analyzed by Gas Chromatography to determine its grease composition. Subsequently, the samples were subjected to analysis by means of optical spectroscopy. The technique used were Fourier Transform Infrared Spectroscopy (FTIR), UV-Vis Absorption Spectroscopy (200-700 nm) and Raman Spectroscopy. Were also used Thermal Lens techniques with experimental setup dual beam so mode mismatched (aberrant model developed by Shen) and Measurement of Dielectric Constant, only to oil urucuri. In the results of FTIR we observed bands very similar for both oils, due to its grease composition and esters, which is similar, being the oleic acid one of the major components in both oils. Already in Raman Spectroscopy was able to see major differences in the spectra mainly concerning the bands of carotenoids, which were identified in the spectrum of oil inajá and not appeared in the spectrum of oil urucuri. And in the absorption spectrum of UV-Vis observed bands associated with oleic acid in both oils and a band associated with β-carotene in oil inajá. In the experiment Dn/dt, we observed the formation of a diverging lens. The value obtained for the diffusivity is close to values obtained for other oils that have as major components, oleic acid and lauric acid oil major components urucuri, found by the analysis by gas chromatography. The result obtained for the dielectric constant of oil urucuri was approximately 3 and is in good agreement with data reported in the literature for the main components of the oil.
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