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Protection Against Aerosol-inactivation of Bacteriophage T₁ by Peptides and Amino Acids

Laboratory of Microbiology, State University, Catharijnesingel 59, Utrecht, the Netherlands

Aerosol-inactivation of bacteriophage T₁ is prevented by peptone and by apolar amino acids (leucine, phenylalanine). The protecting concentration is related to the salt concentration in the spray-medium, which determines the amino acid concentration in the aerosol particle after evaporation to equilibrium. The protective action of surface active agents supports the hypothesis that inactivation is due to surface inactivation. The surface occupation of the protecting amino acids was calculated with the Gibbs adsorption formula and agrees with amounts necessary to cover the air/water interface, thus preventing the phage from reaching the surface.

The decrease of amino acid concentration in the aerosol particle by surface adsorption is calculated in the appendix.

Received 28 February 1972; accepted 18 May 1972.

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