Abstract
Olive oil doped Nanosilica is successfully prepared by wet chemical synthesis method. Samples were analyzed by a variety of techniques, including X-ray diffraction, FTIR, absorption and emission spectrometers to report the capability of Sol-Gel technology on preparing of silica monolith as a host material for Olive oil, and investigate the effect of converting Olive oil to a solid state on its optical properties. Some absorption bands of Olive oil are disappearing from absorption spectrum of doped silica. Only single strong fluorescence peak was appearing in fluorescence spectrum of pure Olive oil at wavelength around 678 nm which attributed to chlorophylls, while fluorescence spectrum to doped sample shows two strong fluorescence peaks at the wavelength 681 nm and 585 nm which attributed to chlorophylls and Vitamin E respectively. The doping process enhances fluorescence activity of Olive oil through enhancing intensity of the fluorescence peak corresponding to Vitamin E. Absorption and fluorescence spectrums to doped silica sample give a good indication in direction of using Sol-Gel technique to prepare for Olive oil doped SiO2 as an optical active material.
Highlights
Virgin olive oil, due to its high price, is a target for adulteration with low price/quality oils
Olive oil doped Nanosilica is successfully prepared by wet chemical synthesis method
Single strong fluorescence peak was appearing in fluorescence spectrum of pure Olive oil at wavelength around 678 nm which attributed to chlorophylls, while fluorescence spectrum to doped sample shows two strong fluorescence peaks at the wavelength 681 nm and 585 nm which attributed to chlorophylls and Vitamin E respectively
Summary
Due to its high price, is a target for adulteration with low price/quality oils. Virgin olive oils present two low peaks at 445 and 475 nm (related to conjugated hydroperoxides), one intense peak at 525 nm (due to Vitamin E) and another peak at 681 nm (due to chlorophylls) [8]. EEMs of virgin and pure olive oils in the range λex = 300 400 nm, λem = 400 - 695 nm He shows that emission peak at the range 600 - 695 nm is attributed to chlorophylls (Figure 1), while emission peak at the range 400 600 nm is attributed to oxidation products and Vitamin E (Figure 2). Major optical properties are determined from analysis of absorption and emission spectra to both of pure Olive oil and prepared doped silica sample
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