This paper investigates the in fl uence of green laser (532 nm) radiation on some physicochemical properties of sesame oil before and after storage period of 15 consecutive days. The samples of sesame oil were irradiated with diode laser beam with wavelength 532 nm and 1 W output power, to duration times of 10, 20, 30, 40, 50 and 60 minutes, and kept for a storage period of 15 consecutive days along with an untreated control at ambient conditions. Physicochemical properties like acid value, ester value, free fatty acids, peroxide value, density, refractive index, viscosity, and moisture of sesame oil were studied. Fourier transform infrared spectroscopy was used to evaluate the degree of oxidation after irradiation processes. Their properties were compared at the 1 st and 15 th day of storage. Study reveals that green laser irradiation increases ester value, saponification, acid value, free fatty acids, peroxide value, viscosity and moisture content of sesame oil; while, it slightly change s refractive index and density. Study also indicates that the storage period of 15 days decreases the ester value, saponif i cation value, and moisture content; while, it accelerate s acid value, free fatty acid, peroxide value, density viscosity, and slightly increases the refractive index. Meanwhile, FTIR spectra of the stored samples revealed a notable difference due to the green laser irradiation and storage. These results suggest that exposing sesame oil to the green laser irradiation in fl uences their oxidation stability and quality.
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