396016.fig.001a
(a)
396016.fig.001b
(b)
396016.fig.001c
(c)
396016.fig.001d
(d)
Figure 1: Effect of temperature, pressure, and time on the yield of SC-CO2 extracts of O. stamineus. (a) Percentage yield (g 100 g−1) of the 9 SC-CO2 extracts of O. stamineus leaves as a function of 4 different time periods (15, 30, 45, and 60 min). The graph shows that 60 min is the optimum time of extraction to obtain high yield. (b) Percentage yield (g 100 g−1) of the 9 SC-CO2 extracts of O. stamineus leaves with respect to the interaction of temperature and pressure. (c) Graphical representation showing the opposite correlation of temperature and pressure with the percentage yield. The pressure showed positive influence on the yield whereas the temperature showed negative impact on yield of the extracts. (d) Graphical illustration of the effect of different pressures at fixed temperatures. The figure reveals that as the pressure increased the percentage yield of the extracts also increased at all tested temperatures.