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Stevia crystal can be defined as a botanical herb that has good properties to use as a substitute for sugar. The electrochemical study has been utilized for the purpose of calculating the limited dosage of the safety that should be used in black tea by cyclic voltammetry (CV) technique using the nanosensor as a more effective glassy carbon electrode (GCE) and carbon nanotubes (CNTs). Stevia’s oxidation current peak has been 400 mV at 0.40 mmol/L concentration (i.e. 28 mg/mL), and reduction current peaks at 600 and –600 mV. It leads to the conclusion that stevia is a limited concentration antioxidant component safe for use in black tea. Additionally, electro-chemical characteristics of the stevia compound in the black tea have been investigated at alkaline and acidic pH in order to give oxidizing behaviors in the alkaline medium, while in an acidic medium as an antioxidant agent in black tea. Other chemical properties such as different scan rates, reliability, and stability have also been investigated.
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