Zey P, Jackson S. Conditions that affect the colorimetric analysis of lipopolysaccharide from Escherichia coli and Treponema pallidum.
Appl Microbiol 1973;
26:129-33. [PMID:
4582814 PMCID:
PMC379738 DOI:
10.1128/am.26.2.129-133.1973]
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Abstract
Material extracted from the Nichols nonpathogenic strain of Treponema pallidum by phenol-water was analyzed by employing a recently reported colorimetric test for detection of lipopolysaccharide (LPS). The fraction isolated from T. pallidum, in combination with the reagent dye, absorbed maximally at a wavelength in the range reported to be positive for LPS. Comparison of this reaction to that of a commercial preparation of Escherichia coli LPS revealed that time and temperature of incubation of the LPS-dye complexes were important variables which had marked but different effects on the LPS of the two sources. However, with careful control of these parameters, concentration-dependent standard curves were established for LPS of both sources. Our results indicate the cell wall of T. pallidum is similar to that of gram-negative organisms.
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