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Grape seeds were collected in ten different dates and classified in seven groups according to their individual hyperspectral imaging characteristics.Proanthocyanidin composition was studied using HPLC-MS for oligomers and acid catalyzed cleavage for polymers characterization. The combination of both analysis provided a complete description of the flavanols. Chemometric analysis was performed to summarize...
Chemical composition of seeds changes during grape ripening and this affects the sensory properties of wine. In order to control the features of wines, the condition of seeds is becoming an important factor for deciding the moment of harvesting by winemakers. Sensory analysis is not easy to carry out and chemical analysis needs lengthy procedures, reagents, and it is destructive and time-consuming...
The voltammetric behaviour of Imatinib (STI 571) and its main metabolite (N-demethylated piperazine derivative) were studied by square-wave techniques, resulting in to two methods for their determination in aqueous and urine samples at pH 2. The application of the square-wave (SW) without the adsorptive accumulation and voltammetric stripping (AdSV) exhibit a peak at a reduction potential of −0.70V...
A simple, rapid and sensitive procedure using nonaqueous capillary electrophoresis (NACE) to measure fluoxetine and its main metabolite norfluoxetine has been developed and validated. Optimum separation of fluoxetine and norfluoxetine, by measuring at 230nm, was obtained on a 60cm × 75μm capillary using a nonaqueous solution system of 7:3 methanol-acetonitrile containing 15mM ammonium acetate, capillary...
The viability of nonaqueous capillary electrophoresis (NACE) was investigated for the simultaneous determination of tamoxifen, imipramine and their main metabolites (4-hydroxytamoxifen and desipramine, respectively). Baseline separation of the studied solutes was obtained on a 57cm × 75μm capillary using a nonaqueous solution composed of 17mM ammonium acetate and 1.25% acetic acid in 80:20 (v:v) methanol–acetonitrile,...
A prototype generator for creating a continuous stream of explosive vapor was referenced quantitatively both to a standard weight from the National Institute of Standards and Technology (NIST) and to the response of an ion mobility spectrometer. Vapors from solid explosive, in a precision bore glass tube at constant temperature, diffuse into an inert gas flow. Mass output rates were determined by...
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