Rapid determination of carboxyhemoglobin by absorbance difference between double wave length

Area of Science:

• Analytical Chemistry
• Clinical Biochemistry
• Spectroscopy

Background:

• Accurate measurement of carboxyhemoglobin (CO-Hb) is crucial for diagnosing carbon monoxide poisoning.
• Existing spectrophotometric methods can be affected by the presence of oxyhemoglobin (O2-Hb) and require complex calibration.
• Temperature variations can significantly alter hemoglobin pigment spectra, complicating measurements.

Purpose of the Study:

• To develop and validate a novel spectrophotometric method for precise CO-Hb determination.
• To overcome the interference of O2-Hb in CO-Hb measurements using a double wavelength approach.
• To establish a rapid and accurate quantification of CO-Hb without the need for standard curves or complex dilutions.

Main Methods:

• Utilized double wavelength spectrophotometry to selectively measure CO-Hb by nulling O2-Hb absorbance.
• Developed a procedure where the sample is saturated with carbon monoxide (CO) for remeasurement and calculation.
• Investigated the effect of temperature on spectral properties and implemented temperature control for diluting solutions.
• Observed CO liberation from CO-Hb at high concentrations and varying dilution factors.

Main Results:

• The double wavelength method successfully nulled O2-Hb interference, allowing direct CO-Hb quantification.
• CO-Hb percentage was accurately calculated from the ratio of absorbance differences after CO saturation.
• Temperature control of the diluting solution was essential for accurate wavelength selection and measurement.
• CO liberation was quantified under specific dilution and cuvette conditions, indicating method stability.

Conclusions:

• The developed double wavelength spectrophotometric method offers a rapid and accurate determination of CO-Hb.
• This technique eliminates the need for standard curves and complex dilutions, simplifying the analytical process.
• The method's speed (under 2 minutes) and accuracy make it suitable for clinical and research applications.