Rapid colorimetric assay for acetaminophen without salicylate or phenylephrine interference.

Rapid colorimetric assay for acetaminophen without salicylate or phenylephrine interference.

A simple rapid, and economical procedure is presented for the quantitative determination of acetaminophen in serum. Acetaminophen is extracted into solvent, and, when back-extracted into base, is simultaneously reacted with Folin-Ciocalteau reagent to form a colored complex. The potential interference of bilirubin is eliminated by treatment with p-diazobenzene sulfonic acid. Results obtained wi...

Rapid colorimetric assay for antimicrobial susceptibility testing of Pseudomonas aeruginosa.

A colorimetric assay based on the reduction of a tetrazolium salt [2,3-bis[2-methyloxy-4-nitro-5-sulfophenyl]-2H-tetrazolium-5-carboxanilide (XTT)] for rapidly determining the susceptibility of Pseudomonas aeruginosa isolates to bactericidal antibiotics is described. There was excellent agreement between the tobramycin and ofloxacin MICs determined after 5 h using the XTT assay and after 18 h u...

Rapid microdilution-colorimetric assay for yeast susceptibility to fluorocytosine.

Acid production by certain yeast species through the fermentation of glucose was used as the basis of an in vitro test for measuring susceptibility of these organisms to 5-fluorocytosine. Serial dilutions of 5-fluorocytosine in yeast nitrogen base broth, with bromothymol blue indicator dye, were made on microtiter plates. A fixed-concentration suspension of yeast cells was added to successive w...

A rapid, simple acetaminophen determination is available.

contribution in the measurement. Concentration of active chemical ingredients , additives, timing parameters, and electronic time constants are variables that help to establish the positive characteristics and define the limitations of each method. To the Editor: We read with interest the recent Letter of Rosenbaum et al. (1) expressing their concerns about possible interference by salicylates ...

Colorimetric Assay for Antifungal Susceptibility