Abstract
This study presents the refractive index and FTIR spectra of virgin coconut oil and virgin olive oil that have been measured in the wavelength range from 491.0-667.8 nm. The measurement of refractive index was carried out using a minimum deviation method while the IR transmission ranging from 600-4000 cm-1 was measured using FTIR spectrometer respectively. The measurements were done at room temperature and the dispersion equations for the studied samples were verified and the Cauchy constants were obtained by fitting the experimental data to the Cauchy formula. For both, refractive index and Cauchy constants, the value obtained are higher in virgin olive oil as compared to virgin coconut oil. A similar result for FTIR absorption spectrum was also observed where the five important peaks explaining the stretching absorption due to aldehyde (C = O) and esters (C-O), bending absorption (methylene (CH2) and methyl (CH3) groups and double bond absorptions (C = O) were strong in virgin olive oil.
Highlights
Refractive index plays an important role in many branches of physics, biology and chemistry
This study reports the refractive index and FTIR spectra for both, virgin coconut oil and virgin olive oil, measured at room temperature 25°C
This peak virgin coconut oil is slightly higher than virgin olive oil (i.e. 0.893 and 0.863 g cm−3)
Summary
Refractive index plays an important role in many branches of physics, biology and chemistry. Knowledge of the refractive index of aqueous solutions and oil is of crucial importance in applications of adulteration of oils and purity. Different methods have been developed to measure the refractive index of liquids, such as the Brewster angle[1,2], ellipsometry[3], attenuated internal reflection (ATR)[4,5] and minimum deviation method[6,7]. The most common and easiest method is the minimum deviation method. The index of refraction can be obtained using the well known equation: n
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