A sterilized mixed herbal drink formula and process was developed for the mixed herbal extracts from Imperata cylindrical (L.) P. Beauv [IC], Murdannia loriformia (Hassk.) Rolla Rao et Kammathy [ML], Hedyotis corymbosa Lamk. [HC] and Orthosiphon aristatus Miq [OA]. Increasing extraction temperature and time decreased the antioxidant activity and increased the total potassium and phenolic compound contents of the herb infusions. Using response surface methodology (RSM), the appropriate extraction condition was 74.6°C for 41 minutes. The most acceptable formula contains a % weight ratio (w/w) of 14:35:27:17of IC: ML: HC: OA infusions to 7% (w/w) sucrose. Decreasing the sterilization temperature and increasing the F0-value reduced the antioxidant activity and total phenolic compounds. The appropriate sterilization temperature and F0 were 135°C and 3 minutes.
©2011 Walter de Gruyter GmbH & Co. KG, Berlin/Boston