Stevioside has the chemical formula of a diterpene glycoside (C38H60O18) and as an active component in Stevia leaves is responsible for the edulcorant properties. Its use has been approved in Brazil, Argentina and Paraguay as well as in China, Korea and Japan. These molecules are highly stable in aqueous solutions within a broad range of pH and temperature ( Abou-Arab et al., 2010 and Virendra and Kalpagam, 2008). Steviosides show remarkable stability in aqueous solution over a wide range of pH values and temperatures. Under thermal treatment in a pH range of 1–10 over 2 h at 60 °C, hardly any degradation of stevioside was be observed, only slight losses up to 5% (pH 2 and 10) were determined on heating to a temperature of 80 °C. Under strong acidic conditions (pH 1.0) forced decomposition of stevioside was observed which resulted in total decomposition after incubation at a temperature of 80 °C for 2 h ( Abou-Arab, Abou-Arab, & Abu-Salem, 2010). Similar results were reported by Buckenhuskers and Omran (1997) who showed that the stevioside possess an excellent heat stability is up to 100 °C for 1 h at pH range 3–9, but rapid decomposition occurs at pH level greater than 9 under these conditions.