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  • Title: Quantitative analysis of residual protein contamination on reprocessed surgical instruments.
    Author: Baxter RL, Baxter HC, Campbell GA, Grant K, Jones A, Richardson P, Whittaker G.
    Journal: J Hosp Infect; 2006 Aug; 63(4):439-44. PubMed ID: 16772103.
    Abstract:
    'Ready-for-use' instruments from surgical instrument trays were examined after routine cleaning and sterilization in a blinded study. These reprocessed instruments originated from five National Health Service hospital trust sterile service departments in England and Wales. Determination of residual protein and peptide contamination was carried out by acid stripping of the instrument surfaces, hydrolysis of the constituent amino acids and quantitative total amino acid analysis. One hundred and twenty instruments were analysed, and the median levels of residual protein contamination per instrument for the individual trays were 267, 260, 163, 456 and 756 microg. Scanning electron microscopy and energy dispersive X-ray spectroscopic analyses of the instruments showed that tissue deposits were localized on surfaces, but there was no significant correlation between overall protein soiling and instrument complexity. The highest levels of residual contamination were found on instruments used for tonsillectomy and adenoid surgery.
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