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Betanidin pK a Prediction Using DFT Methods.

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The study determined the unknown pKa values for Betanidin (Bd), a key molecule in betalain pigments. This research provides crucial data for understanding betalain chemistry and reactivity in various industries.

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Area of Science:

  • Biochemistry
  • Computational Chemistry
  • Physical Chemistry

Background:

  • Betalains are bioactive pigments with applications in food, drugs, and cosmetics.
  • Their properties are sensitive to pH and physicochemical conditions.
  • The acid-base properties of Betanidin (Bd), a core betalain molecule, are not well understood.

Purpose of the Study:

  • To determine the unknown pKa values for all protic groups of Betanidin (Bd).
  • To elucidate the oxidation mechanism involving betalain pigments.
  • To provide tools for understanding the chemical reactivity of betalains.

Main Methods:

  • Computational analysis using five hybrid density functionals (B3LYP, B3PW91, ωB97XD, PBE0, M06-2X).
  • Employing five basis sets (6-31+G(d) to 6-311++G(d,p)) and the SMD implicit solvation model.
  • Incorporating explicit water molecules (1 and 3) to refine solvation free energy calculations.

Main Results:

  • Calculated pKa values for Betanidin (Bd) and related molecules like betanin, betalamic acid, and DOPA.
  • Established the acid-base behavior of Betanidin in aqueous solutions.
  • Developed computational tools for analyzing betalain reactivity.

Conclusions:

  • The determined pKa values are essential for understanding betalain stability and reactions.
  • This study enhances knowledge of betalain chemistry, impacting their industrial applications.
  • The developed methods offer new avenues for investigating bioactive pigment behavior.