[Microbiological assay method for T-3761 concentration in body fluids]

Area of Science:

• Microbiology
• Analytical Chemistry
• Pharmacokinetics

Background:

• Accurate measurement of T-3761 in biological samples is crucial for pharmacokinetic studies.
• Assessing the stability of T-3761 in body fluids is essential for reliable drug monitoring.
• Existing methods may not be suitable for routine T-3761 quantification.

Purpose of the Study:

• To develop and validate a microbiological assay for quantifying T-3761.
• To determine the stability of T-3761 in human serum and urine under frozen conditions.

Main Methods:

• A paper disc diffusion method was employed for T-3761 measurement.
• Escherichia coli Kp was used as the test microorganism.
• Heart infusion agar served as the assay medium.

Main Results:

• The paper disc method provided a reliable assay for T-3761.
• The lower detection limits were 0.05 µg/ml in phosphate buffer and 0.1 µg/ml in human serum.
• T-3761 remained stable in human serum and urine at -20°C for at least 28 days.

Conclusions:

• The paper disc microbiological assay is suitable for T-3761 measurement.
• T-3761 exhibits good stability in key biological matrices under frozen storage.
• This method facilitates T-3761 pharmacokinetic and stability assessments.