Anything other than CO2 (or presumably O2, N2, etc), when dissolved in the water, will compete with the gas for water molecules to bind to. The gas, having fewer water molecules available to associate with (H-bonding, Van Der Waal's force), thus bubbles off at a faster rate. My favorite example is the way Coke (the soda) fizzes when you add a shot of Mont Gay rum.... Your blood/serum is already LOADED with dissolved/colloidal matter, so I doubt if ingestion of quinine is going to significantly effect the solubility of nitrogen in it; the subsequent biochemical rxns to bubble formation are another matter entirely (platelets, complement, et al). Dave Ventre Quincy, MA
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