Soft Independent Modeling of Class Analogy (SIMCA) e Regressão por Mínimos Quadrados Parciais foram usados nesse trabalho para a identificação e quantificação de tiamina, riboflavina, nicotinamida e piridoxina, por espectrofotometria UV-Vis, sem realizar os procedimentos analíticos de separação e pré-concentração. Para a quantificação, os intervalos de trabalho estabelecidos foram 1-14 mg L par...

Photoreactivation was observed in airborne Mycobacterium parafortuitum exposed concurrently to UV radiation (254 nm) and visible light. Photoreactivation rates of airborne cells increased with increasing relative humidity (RH) and decreased with increasing UV dose. Under a constant UV dose with visible light absent, the UV inactivation rate of airborne M. parafortuitum cells decreased by a fact...

stable homogeneous dispersions of carbon nanotubes (cnts) were prepared using ethanol as dispersing agent. then, using sol-gel method, dispersion in the hydroxyapatite matrix and its effects on the microstructure were investigated. the phase composition, chemical structure and morphological and size analyses were performed using xrd, ft-ir, sem, tem/saed/edx and raman spectroscopy. the influenc...

in iran, the majority of vegetable oil producers , use pet for packaging their products . due to high solubility of pet oligomers in the oils , and shelf life of liquid oils , it is expected that some compounds migrate into the oil . this study was carried out to determine the amount of migration of terephtalates from pet bottles into sunflower oil and the effect of temperature and storage time...

The residual levels of permethrin, a pyrethroid insecticide, in two different parts of treated cereal grains have been evaluated. The parts of the grains studied include the husk/bran and the endosperm. In this research, two commonly used fresh grains, millet and corn, were obtained from Dawanau market of Kano State. The fresh grains were spiked with permethrin pesticide commercially known as c...

Macroalgae or also known as seaweed is a low-level plant that does not have true roots, stems and leaves. The function of the leaves replaced by thallus. purpose this study was to composition macroalgae pigments (Gelidium corneum) originating from Yakoba Beach, Jayapura City. method used in research an experimental with pigment analysis using Thin Chromatography Visible UV Spectrophotometry. TL...

Introduction: Applying of a new indicator in food packaging can be effective to inform consumers about the freshness and quality of the products. Materials and Methods: In the current study, a new milk freshness label was investigated containing beetroot color and multi layers of polystyrene. The label characteristics were investigated by estimating color number, release test, and scanning ele...