Fig. 4From: Development, optimization and characterization of flurbiprofen matrix transdermal drug delivery system using Box–Behnken statistical designResponse surface plot showing effect of X polymer (HPMC K15M:ERL100) ratio (a) and di-butyl phthalate (% w/w) (b); Y polymer (HPMC K15M:ERL100) ratio (a) and concentration of d-limonene (% w/w) (c); Z di-butyl phthalate (% w/w) (b) and concentration of d-limonene (% w/w) (c) on response R2 (steady-state flux)Back to article page