Figure 4 : Graphical presentation of the response surface for the chemical markers in the spray-dried propolis powders.

(a) p-coumaric acid, (b) cinnamic acid and (c) artepillin C as a function of extract feed rate and temperature for sample A (encapsulating system A; arabic gum and silicon dioxide, 1:1).

Berretta et al.Journal of Pharmaceutical Technology and Drug Research  2015 4:1DOI : 10.7243/2050-120X-4-1