Serum proteins and acid-base equilibria: a follow-up.

Area of Science:

• Biochemistry
• Physiology
• Analytical Chemistry

Background:

• Accurate assessment of acid-base balance in blood plasma is crucial for clinical diagnosis.
• Existing models may not fully capture the complex interactions influencing plasma pH.
• Human serum albumin's role in buffering requires precise characterization of its acid-base properties.

Purpose of the Study:

• To revise a mathematical model of blood plasma acid-base behavior.
• To incorporate specific pK values of histidine residues on human serum albumin.
• To develop a novel method for evaluating the strong ion difference and understanding metabolic acidosis.

Main Methods:

• Revision of a mathematical model for blood plasma acid-base.
• Determination of pK values for individual histidine residues on human serum albumin using nuclear magnetic resonance (NMR) spectroscopy.
• Development of a method to quantify independent variables determining acid-base balance.

Main Results:

• The revised model successfully incorporates NMR-derived pK values of human serum albumin histidine residues.
• A new method for evaluating the strong ion difference has been established.
• Quantification of independent variables (pH, PCO2, albumin, phosphate) is achievable.
• Potential for exploring "unidentified anions" in metabolic acidosis.

Conclusions:

• The revised mathematical model provides a more accurate representation of blood plasma acid-base behavior.
• The developed method offers a robust approach to assess acid-base status and strong ion difference.
• This work facilitates a deeper understanding of metabolic acidosis and the role of "unidentified anions".