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Body:Improving a drug's stability in the gastrointestinal (GI) tract is paramount for enhancing its bioavailability and therapeutic effectiveness. Various strategies are employed to protect the drug from the harsh gastric milieu and to ensure its release and absorption at the desired site within the GI tract.Polymer coatings are one such method used to shield drugs from the stomach's acidic environment. By preventing premature drug release, these coatings improve the bioavailability of unstable...
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2-Hydroxypropyl-β-Cyclodextrin-Based Complexes Improve Polyphenol Solubility and Bioaccessibility: Evaluation by

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This study developed a validated HPLC-DAD method to quantify propolis polyphenols complexed with HP-β-CD. Complexation improved solubility and stability, but limited intestinal permeation of these beneficial compounds.

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Area of Science:

  • Natural Products Chemistry
  • Analytical Chemistry
  • Pharmacokinetics

Background:

  • Propolis polyphenols offer therapeutic benefits but suffer from poor oral bioavailability.
  • Developing stable, water-soluble propolis formulations is crucial for oral delivery.

Purpose of the Study:

  • To develop and validate an HPLC-DAD method for quantifying propolis polyphenols in HP-β-CD complexes.
  • To evaluate the gastrointestinal behavior and bioaccessibility of these complexed polyphenols.

Main Methods:

  • A green complexation method using 2-hydroxypropyl-β-cyclodextrin (HP-β-CD) and lyophilization.
  • Development and validation of an isocratic HPLC-DAD method for polyphenol quantification.
  • Simulated gastrointestinal digestion and intestinal bioaccessibility models.

Main Results:

  • The HPLC-DAD method was linear, sensitive, and precise for analyzing polyphenols in HP-β-CD matrices.
  • HP-β-CD complexation enhanced polyphenol solubility and gastrointestinal stability.
  • Intestinal bioaccessibility varied, but complexation did not enhance intestinal permeation.

Conclusions:

  • Validated analytical methods are essential for studying complexed natural products.
  • HP-β-CD complexation improves propolis polyphenol solubility and stability but has limitations for intestinal absorption.
  • Further strategies are needed to enhance the oral delivery of propolis polyphenols.