In recent years, the development of disposable electrochemical electrodes has attracted attention, given its relevant advantages such as good sensitivity, low production cost, large scale production, portability for in situ analysis and miniaturization of the system. In this context, the technique of printed electrodes has been widely used in the electroanalytical for the development of new platforms and in the improvement of their performances. With the objective of developing a conductive ink from a resin not found in the literature for disposable electrochemical sensors - alkyd resin - and graphite, through a disposable sensor with relatively low cost and easy to make, through the technique of screen printing, which will be manufactured an electrode using a substrate from PET bottles. One of the most important female estrogens, along with estrone and 17²-estradiol, is estriol (E3), being produced mainly during pregnancy and used as a medicine for its modular role in various diseases. However, inefficiency in the treatment of hormones in waters and effluents, together with their common pharmacological use, make this an emerging contaminant. The device will be characterized by microscopy, spectroscopy and voltammetry techniques, with subsequent analyzes to detect the female hormone E3, seeking to verify its functionality in water - distribution and environmental - and pharmaceutical samples.
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