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Dissolution profiles of (a) baicalin; (b) baicalein; (c) wogonin from hydrogels with binary mixture with S. baicalensis radix lyophilized extract and chitosan using acceptor solution (pH 6.6) containing potassium chloride, sodium chloride, di-potassium hydrogen orthophosphate, magnesium chloride, calcium chloride, and xylitol.
