ABSTRACT
This paper investigates the influence
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 1st and 15th 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 changes refractive index and density. Study also indicates that the storage period of
15 days decreases the ester value, saponification
value, and moisture content; while, it accelerates 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 influences
their oxidation stability and quality.