Evaluation of the stability of polyamines in human serum at different storage temperatures using capillary electrophoresis with indirect ultraviolet detection.

Polyamines are low molecular weight compounds that are present in all living organisms. They are related to the pathological processes, and have been studied as biomarkers for tumor progression, being analyzed in patients' biological fluids. However, polyamines can undergo degradation in serum samples, depending on storage conditions, which impairs their quantification in these matrices.

Experimental mixture design as a tool to evaluate coumarin (1,2-benzopyrone) extraction from Dipteryx odorata seeds.

Experimental mixture design was drawn to evaluated the effects of the interactions between water, methanol and ethyl acetate mixtures on the extraction efficiency of coumarin (1,2-benzopyrone) from Dipteryx odorata seeds. Solvents were defined considering those preferred as green solvents for natural products extraction. Ultrasonic-assisted extraction method developed was simple, fast, low cost and highly selective.

Photoelectrocatalytic degradation of 17α-ethinylestradiol and estrone under UV and visible light using nanotubular oxide arrays grown on Ti-0.5wt%W.

Environmental concern with emerging contaminants has increased in recent years, especially with regard to endocrine-disrupting compounds (EDCs), among them hormones. Conventional water treatment processes have been shown to be ineffective in removing these compounds from water and sewage, while heterogeneous photocatalysis has been demonstrated to be a promising technique. However, the catalytic efficiency is strongly related to the choice of the photocatalyst material.

Optimization of chemometric approaches for the extraction of isorhamnetin-3-O-rutinoside from Calendula officinalis L.

The application of Design of Experiments (DoE) to the determination of optimum conditions for an extraction process relies on the correct selection of mathematical models. The linear model is the one typically used; however, in some cases it does not always have superior performance, ignoring the real nature of the data and its appropriate descriptive model. In order to evaluate the extraction efficiency of isorhamnetin-3-O-rutinoside from flowers of Calendula officinalis L.