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The effects of surfactant type (B1: Span 40, B2: Span 60 and B3: Span 80) and its relative concentration (-1: low or 2.6 mole ratio, 0: medium or 2.9 mole ratio, and 1: high or 3.2 mole ratio) on the particle size (a), zeta potential (b), drug encapsulation efficiency (c), and drug skin permeability (d) of NAG-containing niosomes comprised of Span:chol:DCP (X:3.2:1, mole ratio).
