PMC/PubMed Indexed Articles
Indexed In
- Academic Journals Database
- Open J Gate
- Genamics JournalSeek
- Academic Keys
- JournalTOCs
- China National Knowledge Infrastructure (CNKI)
- CiteFactor
- Scimago
- Ulrich's Periodicals Directory
- Electronic Journals Library
- RefSeek
- Hamdard University
- EBSCO A-Z
- OCLC- WorldCat
- SWB online catalog
- Virtual Library of Biology (vifabio)
- Publons
- MIAR
- University Grants Commission
- Geneva Foundation for Medical Education and Research
- Euro Pub
- Google Scholar
Useful Links
Share This Page
Journal Flyer
Open Access Journals
- Agri and Aquaculture
- Biochemistry
- Bioinformatics & Systems Biology
- Business & Management
- Chemistry
- Clinical Sciences
- Engineering
- Food & Nutrition
- General Science
- Genetics & Molecular Biology
- Immunology & Microbiology
- Medical Sciences
- Neuroscience & Psychology
- Nursing & Health Care
- Pharmaceutical Sciences
Beate Siewert
Beate Siewert
Switzerland
Publications
-
Research Article
Sustained Release for St. John?s Wort: A Rational Idea?
Author(s): Lucia Disch, Kristina Forsch, Beate Siewert, Jürgen Drewe and Gert Fricker Lucia Disch, Kristina Forsch, Beate Siewert, Jürgen Drewe and Gert Fricker
Purpose: Aim of this study was to evaluate St. John’s wort (SJW) extract for its suitability to be formulated in a sustained release dosage form using Ze 117 as example extract. Methods: Hypericin as marker for naphtodianthrones and quercetin as marker for contained flavonoids in Ze 117 were evaluated for solubility through shake flask method and for in vitro permeability through Caco-2 monolayers. Furthermore, different intestinal segments were screened for absorption capacity of markers using an in situ rat model. Results: Over a physiological pH range, naphthodianthrones exhibited pH-dependent solubility profiles with best solubility at pH 6.8. In contrast, solubility of flavonoids was pH-independent. In Caco-2 monolayer system, low permeation was evident for naphthodianthrone hypericin, while the flavonoid quer.. View More»
DOI: 10.4172/jbb.1000363