Prescription versus over-the-counter venotonics: HPLC-DAD and static digestive model simulation comparison
Robert Novotny1, Matyas Orsak2, Jaromir Lachman2
1Transplantation Surgery Department, Institute for Clinical and Experimental Medicine, Prague, Czech Republic - novr@ikem.cz.
Prescription and over-the-counter venotonics containing diosmin and hesperidin meet declared amounts. Digestion simulation showed similar solubility and behavior for both types of venotonics, with active substances only determinable after alkalization.
Area of Science:
- Pharmacology
- Analytical Chemistry
Background:
- Venotonics are therapeutic agents with vaso-protective properties used for venous insufficiency.
- Comparison of prescription and over-the-counter (OTC) venotonics is crucial for therapeutic efficacy.
- Understanding venotonic composition and behavior during digestion is essential for patient outcomes.
Purpose of the Study:
- To compare the composition of prescription and OTC venotonics.
- To simulate the digestion of venotonics using a static digestive model.
- To analyze the solubility and detectability of active substances (diosmin and hesperidin) during simulated digestion.
Main Methods:
- High-performance liquid chromatography with UV detection (HPLC-DAD) was employed for quantitative analysis.
- A static digestive model simulated oral to intestinal phases.
- Samples were analyzed before and after alkalization to assess solubility and detectability.
Main Results:
- All tested venotonics, both prescription and OTC, contained declared amounts of diosmin and hesperidin.
- Simulated digestion demonstrated consistent solubility and behavior across all tested venotonics.
- Active substances were undetectable in non-alkalized samples but formed a flavonoid complex after alkalization.
Conclusions:
- Diosmin and hesperidin content in tested venotonics align with declared amounts.
- Prescription and OTC venotonics exhibit similar behavior during simulated digestion.
- Alkalization is necessary for the determination of active substances in the simulated digestive environment.
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