The use of thermal lensing for the determination of pyrogens
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Abstract.
Based on the optimized spectrophotometric determination of pyrogens (of various classes (p-aminophenol and endotoxins), thermal lensing was applied to the determination of these substances at the submicrogram level. The limit of detection of p-aminophenol, a pyrogenic impurity in pharmaceutical formulations of paracetamol, by reaction with resorcinol in alkaline solutions is 100 ng mL–1. Phloroglucinol was considered as an analog of resorcinol as a reagent in this reaction. The conditions of spectrophotometric determination of pyrogenic lipopolysaccharides (endotoxins) by ion-pair formation with methylene blue (the limit of detection is 100 ng mL–1), by ion-pair formation with Stains-All (1-ethyl-2-[3-(1-ethylnaphtho[1,2-d]thiazolin-2-ylidene)-2-methylpropenyl]naphtho[1,2-d]thiazolium bromide) (the limit of detection is 500 ng mL–1), and by reaction of 2-keto-3-deoxyoctonic acid with thiobarbituric acid (the limit of detection is 800 ng mL–1) were proposed. The optimized procedure for 2-keto-3-deoxyoctonic acid was applied for thermal lensing that provided a decrease in the limit of detection to 70 ng mL–1 and was also used for lipopolysaccharide determination in the endotoxin standard from E. coli.
Keywords
Thermal lensing Pyrogens Endotoxins Lipopolysaccharides p-AminophenolAbbreviations
- KDO
2-Keto-3-deoxyoctonic acid
- LAL
Limulus amebocyte lysate
- LPS
Lipopolysaccharide
- TLS
Thermal lens spectrometry
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