Abstract
Poor recovery of spiked endotoxin in the Limulus amebocyte lysate assay (LAL assay) was observed in the presence of recombinant human interleukin-11 (rhIL-11), a cationic, hydrophobic protein. Detection of endotoxin activity remaining in the empty glass tubes in which endotoxin and rhIL-11 mixtures were incubated indicated adsorption of endotoxin on glass. At low concentrations of rhIL-11, a correlation between endotoxin adsorbed on glass and a decrease of endotoxin in solution was observed. Adsorption of rhIL-11 on glass correlated with adsorption of endotoxin, which indicates that rhIL-11 mediates adsorption of endotoxin on glass. Consequently, adsorption of endotoxin on glass may occur in the presence of other substances which bind to both of endotoxin and glass.
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