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Method of reducing the number of microorganisms in a media and a method of preservation

  • US 4,259,103 A
  • Filed: 05/14/1979
  • Issued: 03/31/1981
  • Est. Priority Date: 03/12/1979
  • Status: Expired due to Term
First Claim
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1. A method of reducing the number of viable bacteria, fungi, algae and yeast in media by physically contacting the bacteria, fungi, algae and yeast with a surface which has been altered in a manner which comprises contacting a substrate, which develops a negative charge in water, with an amount effective to inhibit the growth of said microorganisms of a substance that ionizes in water to form cations and anions which substance is selected from the group consisting of sulfonium salts of the formula R8 R9 R10 S+ X-, sulfonium salts of the formula ##STR6## isothiuronium salts of the formula RSC(NH2)2+ X-, isothiuronium salts of the formula ##STR7## phosphonium salts of the formula R4 R5 R6 R7 P+ X-, and phosphonium salts of the formula ##STR8## wherein R8, R9 and R10 are independently alkyl groups or aralkyl groups wherein there is a total of less than 30 carbon atoms in the molecule or a silylsubstituted alkyl radical of the formula ##STR9## where Y is a hydrolyzable group, Q is an alkyl radical of 1 or 2 carbon atoms or (CH3)3 SiO, a has an average value of 0-3, b has an average value of 0-3, n is an integer of 1 or greater and X- is a water soluble monovalent anion, R is independently alkyl or aralkyl groups wherein there is a total of less than 20 carbon atoms in the molecule or a silylsubstituted alkyl radical of the formula ##STR10## as defined above, R4, R5, R6 and R7 are as defined above for R8, R9 and R10 ;

  • R11 and R12 are independently alkyl groups or aralkyl groups wherein there is a total of less than 60 carbon atoms in the molecule and d is an integer of 1 or greater.

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