New ultrasensitive detection technologies and techniques for use in microdosing studies.

Area of Science:

• Pharmacology
• Analytical Chemistry
• Drug Development

Background:

• Microdosing studies administer sub-pharmacological drug doses to human volunteers for early pharmacokinetic data.
• Extremely low drug doses (≤100 µg) necessitate highly sensitive analytical techniques.
• Accurate measurement of drug concentrations in biological matrices is crucial for safety and efficacy assessment.

Purpose of the Study:

• To review and compare three primary analytical technologies used in microdosing studies.
• To evaluate the sensitivity and applicability of PET, LC-MS/MS, and AMS for microdosing.
• To provide insights into selecting appropriate analytical methods for early drug development.

Main Methods:

• Positron Emission Tomography (PET) utilizes radioisotopic tracers for imaging.
• Liquid Chromatography-tandem Mass Spectrometry (LC-MS/MS) offers high sensitivity (pg/ml range) without tracers.
• Accelerator Mass Spectrometry (AMS) is an isotope ratio method with extreme sensitivity (ag/ml range) using radioisotopic tracers.

Main Results:

• PET and AMS rely on radioisotopic tracers, with AMS offering exceptional sensitivity.
• LC-MS/MS provides sensitive detection in the pg/ml range without isotopic labeling.
• Each technique presents distinct advantages and limitations for microdosing pharmacokinetic analysis.

Conclusions:

• The choice of analytical technique depends on study-specific requirements, sensitivity needs, and the availability of tracers.
• Advanced analytical methods like PET, LC-MS/MS, and AMS are essential for successful microdosing studies.
• These techniques enable the collection of critical preliminary pharmacokinetic data in early drug development.