title: Sodium acetate as a preservative in protein hydrolysate solutions.
abstract: The inhibitory effect of sodium acetate on microorganism growth in protein hydrolysate solutions was studied. Solutions of 5% protein hydrolysate and 5% dextrose in water (seven parts) and 50% dextose in water (three parts) containing 0, 30, 50 and 90 mEq/liter of sodium acetate were inoculated with Staphylococcus aureus, Escherichia coli, Candida albicans and Pseudomonas aeruginosa. The number of colony-forming units in the solutions after inoculation was compared with that after incubation for 24 hours at 37 C. Sodium acetate inhibited growth of S aureus and E coli. Growth of P aeruginosa was inhibited in protein hydrolysate solutions with and without sodium acetate; inhibition could not be attributed solely to sodium acetate and may have been releated to pH of the solutions (4.7 to 5.4). Growth of C albicans was not inhibited by sodium acetate. Sodium acetate reduced growth of some common contaminants of protein hydrolysates. Sodium acetate is known to reduce metabolic acidosis, a reported complication of parenteral nutrient therapy and a possible predisposing factor in C albicans sepsis. Addition of sodium acetate to protein hydrolysate solutions should be considered seriously.
mesh_terms: D000085:Acetates / Q000494:pharmacology*; D002176:Candida albicans / Q000254:growth & development; D004926:Escherichia coli / Q000254:growth & development; D008851:Micropore Filters; D010289:Parenteral Nutrition, Total; D010592:Pharmaceutic Aids; D011310:Preservatives, Pharmaceutical; D011492:Protein Hydrolysates; D011550:Pseudomonas aeruginosa / Q000254:growth & development; D013211:Staphylococcus aureus / Q000254:growth & development
chemical_list: D000085:Acetates; D010592:Pharmaceutic Aids; D011310:Preservatives, Pharmaceutical; D011492:Protein Hydrolysates