A kinetic method for glucose that is insensitive to variations in temperature and enzyme activity

Area of Science:

• Biochemistry
• Analytical Chemistry
• Clinical Diagnostics

Background:

• Accurate glucose determination is crucial for diagnosing and managing diabetes.
• Conventional kinetic methods for glucose analysis can be sensitive to experimental variations.
• Existing methods require strict control over temperature and reagent composition.

Purpose of the Study:

• To adapt a new kinetic analysis approach for reliable glucose determination.
• To develop a method less dependent on experimental variables compared to conventional techniques.
• To validate the adapted method for glucose measurement in human serum samples.

Main Methods:

• Adapted a novel kinetic analysis approach based on hexokinase/glucose-6-phosphate dehydrogenase.
• Utilized a modified reagent system where NADH production rate is first-order in glucose concentration.
• Employed absorbance vs. time data recorded after 30 seconds and multiple-linear-regression analysis.
• Computed absorbance change to simulate reaction completion for accurate quantification.

Main Results:

• Demonstrated a linear relationship between glucose concentration and computed absorbance change.
• Achieved a 50-fold reduction in dependence on experimental variables compared to conventional methods.
• Validated the method on 51 human sera, yielding a regression equation (y = 1.01x - 0.3) comparable to hospital laboratory results.
• Showed reliable performance without rigorous control of temperature or reagent composition.

Conclusions:

• The adapted kinetic method provides a robust and reliable approach for glucose determination.
• This method offers enhanced stability and reduced sensitivity to experimental conditions.
• The technique shows significant potential for clinical diagnostics and routine glucose monitoring.