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Critical Reviews™ in Therapeutic Drug Carrier Systems

Published 6 issues per year

ISSN Print: 0743-4863

ISSN Online: 2162-660X

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 2.7 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 3.6 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.8 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00023 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.39 SJR: 0.42 SNIP: 0.89 CiteScore™:: 5.5 H-Index: 79

Indexed in

Cracking the Junction: Update on the Progress of Gastrointestinal Absorption Enhancement in the Delivery of Poorly Absorbed Drugs

Volume 25, Issue 2, 2008, pp. 117-168
DOI: 10.1615/CritRevTherDrugCarrierSyst.v25.i2.10
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ABSTRACT

There are many challenges to the oral delivery of peptide-based drugs. In addition to overcoming issues relating to the metabolic stability of peptides and maximizing adherence and penetration through the mucus layer, new formulations to enhance absorption across the intestinal epithelium are required for effective delivery. The tight junctions between epithelial cells usually permit the flux of small hydrophilic drugs, while restricting the movement of larger hydrophilic drugs. Efforts to reversibly open tight junctions with paracellular permeability enhancers (PPE) have been shown to promote the absorption of larger molecules, including protein therapeutics. This review describes the proteins that comprise the tight junction and outlines various methods that have been explored to enhance class III solute absorption across this barrier, with particular attention to efforts to enhance oral peptide delivery. In particular, peptide-based PPEs are highlighted. Being proteins themselves, they potentially share physicochemical properties, diffusional characteristics, and stability issues with the therapeutic proteins being delivered. By understanding the mechanisms by which these PPEs act, analogues and peptidomimetics can be designed in order to safely enhance the delivery of biotech cargoes via the oral route.

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