Abstract
A procedure for the photometric determination of polysaccharides with phenol in a sulfuric acid solution was optimized to reduce the blank signal. The procedure was used for the thermal-lens determination of polysaccharides (heparin, dextran, plantaglucide) qualitatively reproducing the chemical properties of pyrogenic lipopolysaccharides under experimental conditions. The detection limits were found to be 2–5 μg/mL. With the use of thermal-lens spectrometry, lipopolysaccharides can be determined in water (in a model sample, pharmaceutical preparation pyrogenal) with a detection limit of 0.3 μg/mL, which is ten times lower than the minimal injected concentration of the preparation.
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