@article{Suta Poosittisak_Porntip Wongkaew_2017, title={ELECTROCHEMICAL STUDY OF ALOE GEL AND EMODIN ON A SCREEN PRINTED CARBON ELECTRODE}, volume={11}, url={https://geomatejournal.com/geomate/article/view/2689}, abstractNote={<p>The most useful part of natural aloe vera is aloe-gel (AG) and aloe-emodin(AE). AE has various<br>pharmacological effects including, antiviral, antimicrobial and laxative activities, while AG has mainly been<br>used as an anti- inflammable agent. Some medical activities are related to their redox activity. This paper<br>presents a simple strategy to carry out of AG and AE based on screen printed carbon electrode (SPCE). The<br>electrochemistry of AG and AE was investigated at pH 7.05 by cyclic voltammetry and differential pulse<br>voltammetry. The redox mechanism is discussed. Results showed that the available working potential range<br>for the study was the potential window between 0.60 V to -0.40 V and the peak currents of the cathodic peak<br>increased linearly with the square root of scan rate. The peak potentials of the cathodic peaks shifted negatively<br>as pH increased from 3.05 to 9.07. The appearance of other cathodic and anodic peak in fresh aloe vera sample<br>indicates that the fresh aloe vera consists of several redox active species. It is concluded that a low cost, easy<br>and convenient detection of aloe emodin was successfully achieved with this electrochemical system.<br><br></p>}, number={28}, journal={GEOMATE Journal}, author={Suta Poosittisak and Porntip Wongkaew}, year={2017}, month={Dec.}, pages={2815–2819} }