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Theory and computer programs for calculating solution pH, buffer formula, and buffer capacity for multiple component

H Okamoto1, K Mori, K Ohtsuka

  • 1Pharmacia & Upjohn, Tsukuba Research Laboratories, Ibaraki, Japan. hirokazu.okamoto@am.pnu.com

Pharmaceutical Research
|March 1, 1997
PubMed
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New computer programs calculate buffer solutions for pH, formula, and capacity. These tools accurately predict buffer performance across various temperatures and ionic strengths, aiding researchers in selecting optimal buffer systems.

Area of Science:

  • Biochemistry and Analytical Chemistry
  • Computational Chemistry and Software Development

Background:

  • Accurate buffer solution calculations are crucial in various scientific disciplines.
  • Existing methods may have limitations in handling diverse buffer components and conditions.

Purpose of the Study:

  • To develop a theoretical framework and user-friendly computer programs for calculating buffer properties.
  • To enable precise determination of solution pH, buffer formula, and buffer capacity.
  • To create a versatile tool applicable to various buffer compositions and ionization states.

Main Methods:

  • Developed a theoretical model for buffer calculations applicable to any buffer system.
  • Implemented the theory into Microsoft Excel-based computer programs.
  • Calculated and experimentally validated buffer solutions including citrate, phosphate, Tris, borate, and glycine.

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Main Results:

  • The developed programs accurately predicted pH values within +/- 0.1 pH unit for 96 out of 108 predictions.
  • Validation was performed across a temperature range of 25-70°C and ionic strengths of 0.1-0.5 M.
  • The theoretical model and programs demonstrated high predictive power for diverse buffer systems.

Conclusions:

  • The developed computer programs provide a reliable method for calculating buffer properties.
  • These tools are valuable for identifying suitable buffer solutions under varying temperature and ionic strength conditions.
  • The programs enhance the efficiency and accuracy of buffer selection in experimental settings.