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A new on-line reverse phase HPLC method for determining the solubility of compounds in propellant based metered dose inhaler (MDI) formulations was compared with a conventional method. The new method employs a direct injection from a MDI vial into the needle injector port of a manual injector. To evaluate the two methods, beclomethasone dipropionate (BDP), 5,5-diphenyl hydantoin and 3,3′-diindolylmethane,...
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