Abstract
In order to separate and identify functional groups of molecules responsible for fluorescence compounds present in biodiesel, a column chromatography coupled with infrared spectroscopy and multivariate analysis was performed. A biodiesel sample was packed in a chromatographic column and the fractions obtained were used to perform the analyses. Before undergoing the separation process, the biodiesel sample was analyzed by light emitting diode (LED)-induced fluorescence and compared its spectrum with β-carotene and soybean oil patterns. The low cost and speed of analysis suggest that this technique can be used in the separation of biodiesel substances. The fluorescence emission spectra allowed identifying molecules such as β-carotene, in which the spectrum of its pattern exhibited fluorescence within a region ranging from 500 to 700 nm and chlorophyll molecules. When soybean oil is excited at around 405 nm, it features a fluorescent emission band within the region of 670 nm, which reveals the presence of chlorophyll. Infrared spectroscopy coupled with principal component analysis allowed to discriminate the fractions and to identify the functional groups of compounds present in the sample.
Highlights
Researchers and scientists have begun to evaluate new sources of renewable energy in order to reduce crude oil consumption, since it is classified as a great polluter of the environment
Biodiesel combustion in engines leads to reduction of smoke, suspended particulates, carbon monoxide (CO) and hydrocarbon emissions (HC)
Refined soybean oil was purchased from a local supermarket, which owned the trademark of the product
Summary
Researchers and scientists have begun to evaluate new sources of renewable energy in order to reduce crude oil consumption, since it is classified as a great polluter of the environment. Due to the increasing cost of barrels of crude oil and the reduction of reserves, interest in biofuels have emerged as alternative clean and renewable energy. Biodiesel combustion in engines leads to reduction of smoke, suspended particulates, carbon monoxide (CO) and hydrocarbon emissions (HC). It increases emissions of nitrogen oxide (NO2), improving or maintaining motor efficiency.[2,3,4,5] The kinematic, viscosity, density, and calorific value properties of biodiesel are the
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