The present study has shown that the hydroethanolic extract from Araucaria angustifolia leaves as well as many different fractions and subfractions exhibited antiherpes activity, supporting the use of this plant species in folk medicine.
In this study, gold nanoparticles (AuNP) were synthesized using a novel stabilizer based on dialdehyde starch polymer (DAS) and dimethyl sulfoxide (DMSO) and the nanomaterial was applied to develop a sensor for methyldopa detection. The nanoparticles were characterized by transmission electron microscopy and the proposed sensor was electrochemically characterized by electrochemical impedance spectroscopy, chronocoulometry and square-wave voltammetry. Under optimized conditions (0.1 mol L À 1 McIlvaine buffer solution at pH 3.5 and 50 μL AuNP/DAS-DMSO), using square-wave voltammetry, the calibration curve presented a linear range of 0.99 to 19.60 μmol L À 1 , with a detection limit of 0.50 μmol L À 1 . The sensor showed good accuracy, with coefficients of variation of 7.8 % (inter-day; n = 6) and 5.9 % (intra-day; n = 3), and recovery values in the range of 95.3 to 105.2 %. The methyldopa content in a pharmaceutical sample was determined and the results show good correlation with the label value and the method recommended by the Pharmacopoeia, representing a fast and accurate alternative for detecting methyldopa in pharmaceutical products.
This paper describes the development of an electrochemical sensor for carbendazim detection using a glassy carbon electrode modified with a new nanomaterial obtained from the synthesis of magnetite nanoparticles stabilized with ascorbic acid and β-cyclodextrin. The nanoparticles were characterized and the sensor was evaluated by electrochemical impedance spectroscopy and square wave voltammetry. The calibration curves were linear for carbendazim concentration ranges of 3.33-13.29 μmol L À 1 and 16.61-29.82 μmol L À 1 with detection limits of 0.43 μmol L À 1 and 2.34 μmol L À 1 , respectively. The proposed sensor represents a fast, efficient and lowcost analytical tool for pesticide monitoring in natural waters.
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