Abstract
To identify the microorganisms that can grow rapidly in total parenteral nutrition (TPN) solutions, we investigated the growth of the major causes of catheter-related blood stream infection (Staphylococcus aureus, Serratia marcescens, Bacillus cereus, and Candida albicans) in TPN solutions without lipid. Experiment 1: A commercial TPN solution without lipid containing multivitamins (pH5.6) was used. A specific number of each test microorganism was added to each 10 mL of the TPN solution and incubated at room temperature. An aliquot of test solution was sampled and inoculated to SCD agar plates at 0, 24, and 48 hrs after the addition of the microorganisms. The number of microorganisms was counted as colony forming units. Experiment 2: The other 2 commercial TPN solutions without lipid (pH5.5) were supplemented with multivitamins. The pH values of the solutions were adjusted to about 6.0, 6.5, or 7.0 using 0.5 mol/L NaOH. The addition of microorganisms, incubation, and counting were performed in the same manner. Experiment 1: S. aureus, S. marcescens, and B. cereus did not increase in the TPN solution without lipid containing multivitamins (pH5.6), but C. albicans increased rapidly. Experiment 2: The 3 bacterial species did not i...Continue Reading
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