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Response surface and contour plots showing the combined effects of Zein (X1) and Acrylic acid (X2) for maximum intrinsic viscosity (ɳ) (a, b), dynamic swelling at pH 1.2 (c, d), diffusion coefficient (e, f), sol–gel fraction (g, h), and porosity (i, j), when concentration of N, N-methylene bisacrylamide (X3) was held at fixed level (zero level = 0.05 g)
