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Physiological barriers are semi-permeable cellular structures restricting drug diffusion into intracellular compartments and tissues. There are six types of physiological barriers: blood endothelial, cell membrane, blood-brain, blood-cerebrospinal fluid (CSF), blood-placenta, and blood-testis barriers.
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Kratom Alkaloids: A Blood-Brain Barrier Specific Membrane Permeability Assay-Guided Isolation and Cyclodextrin

András Dohárszky1,2, Erika Mária Vági3, Árpád Könczöl1,2

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Researchers optimized kratom alkaloid extraction for enhanced central nervous system penetration. Mitragynine and related compounds showed high blood-brain barrier permeability, with cyclodextrin complexation improving bioavailability.

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Mitragyna speciosaaffinity capillary electrophoresisbioavailability enhancementblood–brain barrier permeabilitycomplex stabilityextractioninclusion complexesindole alkaloidsparallel artificial permeability assayphase-solubility study

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Area of Science:

  • Pharmacology and Natural Products Chemistry
  • Drug Delivery and Bioavailability Enhancement

Background:

  • Mitragynine, an atypical opioid analgesic, offers a unique mechanism and favorable side-effect profile.
  • Kratom alkaloids possess potential therapeutic value, but their central nervous system (CNS) penetration and bioavailability require optimization.

Purpose of the Study:

  • To optimize alkaloid extraction from kratom leaves for enhanced CNS penetration.
  • To identify and isolate kratom alkaloids with significant blood-brain barrier (BBB) permeability.
  • To investigate cyclodextrin (CD) complexation for improving the bioavailability of these alkaloids.

Main Methods:

  • Optimized extraction and purification sequence involving CPC, flash chromatography, and preparative HPLC.
  • In vitro blood-brain barrier permeability assessment using the PAMPA-BBB model.
  • Affinity capillary electrophoresis and phase-solubility studies to evaluate alkaloid-cyclodextrin complexation with nearly 40 CD derivatives.

Main Results:

  • Mitragynine, speciociliatine, speciogynine, and paynantheine demonstrated excellent in vitro BBB permeability.
  • The optimized isolation procedure successfully yielded these four BBB-penetrant alkaloids.
  • Neutral and negatively charged cyclodextrins formed complexes with all four alkaloids, with negatively charged derivatives (Sugammadex, Subetadex, sufoalkylated-beta-CDs) showing the highest stability constants (>1000 M⁻¹).

Conclusions:

  • The study successfully optimized kratom alkaloid extraction and identified key compounds with high BBB permeability.
  • Cyclodextrin complexation, particularly with specific negatively charged derivatives, is a promising strategy for enhancing the bioavailability of these kratom alkaloids.
  • These findings provide a foundation for further development of kratom-derived compounds for therapeutic applications.