At elevated humidity (53% RH and 4°C), a clear trend emerged where titre loss was inversely proportional to PVP molecular weight, ranging from 1.76 log 10 for PVP K100 to 9.45 log 10 for PVP K15.
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Stability of bacteriophages in spray-dried polymeric formulations: Effect of excipient polyvinylpyrrolidone glass transition temperature and molecular weight.
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