Some considerations on quantitative methodology and detection limits in organic mass spectrometry

Area of Science:

• Analytical Chemistry
• Spectroscopy

Background:

• Accurate quantitation in mass spectrometry relies on reliable sensitivity data.
• Variability in experimental conditions can affect compound sensitivity measurements.

Purpose of the Study:

• To establish reproducible mass spectrometric sensitivity data for diverse organic compounds.
• To assess the feasibility of using a single standard for calibrating various organic compounds.

Main Methods:

• Collected mass spectrometric sensitivity data over time and under varied conditions.
• Measured sensitivity on both relative and absolute bases.
• Evaluated reproducibility of relative sensitivities over a six-month period.

Main Results:

• Developed mass spectrometric sensitivity data for cholesterol, cholestane, DDT, decafluorotriphenylphosphine, morphine, LSD, and methyl stearate.
• Achieved reproducible relative sensitivities (within a factor of three) for most compounds over six months, excluding morphine.
• Demonstrated the potential for using a single standard for calibrating diverse organic compounds.
• Realized detection limits as low as 50 femtograms for LSD via direct inlet probe.

Conclusions:

• Mass spectrometric sensitivity data can be reliably reproduced for many organic compounds.
• The reproducibility supports the use of a single standard for broad organic compound calibration.
• Low detection limits are achievable for specific compounds like LSD.