Intracavity laser polarization spectrometer for biomolecule traces

Area of Science:

• Spectroscopy
• Analytical Chemistry
• Biophysics

Background:

• Intracavity laser spectroscopy offers high sensitivity for analyzing samples with broad absorption bands.
• Biomolecules in solution often exhibit broad absorption, posing challenges for traditional spectroscopic methods.
• Argon ion lasers provide multiple narrow spectral lines suitable for detailed analysis.

Purpose of the Study:

• To propose and describe a polarization variant of an intracavity laser spectrometer.
• To adapt the spectrometer for the spectral analysis of liquid samples, particularly those with broad absorption bands like biomolecules.
• To achieve a minimal measurable absorbance for sensitive detection of trace substances.

Main Methods:

• Utilizing a polarization variant of an intracavity laser spectrometer.
• Employing an argon ion laser emitting in the 275 to 529 nm range.
• Optimizing operating conditions to enhance sensitivity and dynamic range.

Main Results:

• The developed spectrometer successfully analyzes liquid samples with broad absorption bands.
• A minimal measurable absorbance of 10(-5) optical density units was achieved through procedural optimization.
• The spectrometer demonstrated a wide dynamic range, suitable for trace content determination.
• Trace amounts of amino acids in methanol were successfully quantified.

Conclusions:

• The proposed polarization intracavity laser spectrometer is effective for analyzing biomolecules in solution.
• The optimized method allows for highly sensitive measurements of absorbance.
• This technique is valuable for determining trace components in various liquid samples.