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Beta-lactoglobulin/folic acid complexes: formation, characterization, and biological implication.

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Beta-lactoglobulin (beta-LG) binds folic acid (FA), enhancing its stability. This protein-FA complex shows potential as a carrier for FA in functional foods.

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Area of Science:

  • Food Science and Technology
  • Biochemistry
  • Nutritional Science

Background:

  • Beta-lactoglobulin (beta-LG) is a primary whey protein in bovine milk with broad binding capabilities.
  • Folic acid (FA), a vital B vitamin, is crucial for numerous physiological functions.

Purpose of the Study:

  • To investigate the interaction between beta-LG and FA.
  • To determine the binding constant, mode, and FA photodegradation influenced by beta-LG.
  • To assess the potential of beta-LG-FA complexes in functional foods.

Main Methods:

  • Fluorescence spectroscopy was employed to study beta-LG and FA interactions.
  • Protein intrinsic fluorescence was utilized to determine binding parameters at different excitation wavelengths (280 nm and 295 nm).

Main Results:

  • FA binds to the surface of beta-LG, potentially in the groove between the alpha-helix and beta-barrel.
  • Binding constants were determined as 2.0 (+/-0.6) x 10(6) M(-1) at 280 nm and 4.3 (+/-2.2) x 10(5) M(-1) at 295 nm.
  • Complexation with beta-LG significantly enhances the photostability of FA.

Conclusions:

  • Beta-lactoglobulin forms a stable complex with folic acid.
  • The beta-LG-FA complex offers improved photostability for folic acid.
  • Beta-LG-FA complexes are promising for use as effective folic acid carriers in functional food applications.