Research Article

Determination of Curcuma longa L. (Turmeric) Leaf Extraction Conditions Using Response Surface Methodology to Optimize Extraction Yield and Antioxidant Content

Figure 5

Response surface plot for the yield (%, Y1) of the turmeric leaf extract at a constant value comparing extraction temperature (°C, X1) and time (min, X2). The optimum yield (%) of the turmeric leaf extract from CCD was 15.58 with the extract condition, 150 min (time), 85°C (temperature), and 1 : 25 (ratio).