Abstract:
:The purpose of the present study was to examine the human oral absorption (HOA) predictability of the experimentally determined immobilized artificial membrane (IAM) chromatography capacity factor (log k'IAM) in conjunction with physicochemical descriptors. Transcellular permeation was modeled based on determination of log k'IAM considering pH partition hypothesis, and the independent variables were polar surface area (PSA) and molecular weight (MW). The correlation between log k'IAM determined at different pH and n-octanol/water partition coefficient (log P) and contribution of polarity (PSA) and size (MW) in the transcellular permeation model were the extension to the previous work. A data set of 37 compounds with partition coefficient values taken from the literature was employed to show importance of ionic interaction in oral absorption prediction. The highest log k'IAM value among screened pH 4.5, 5.5, 6.5 and 7.4 (log k'IAM4.5-7.4) in conjunction with PSA predicted HOA with coefficient of determination (CD) of 0.9001 compare to log k'IAM4.5-7.4 alone with CD of 0.8454 after excluding bretylium from the set of 28 structurally diverse drugs for known reason. PSA helped to avoid over estimation of HOA for amiloride, famotidine and furosemide. The model was tested for its applicability in drug development program and found to predict oral absorption using physically meaningful and structurally related properties making them relatively straightforward for a medicinal chemist to interpret.
journal_name
Int J Pharmjournal_title
International journal of pharmaceuticsauthors
Kotecha J,Shah S,Rathod I,Subbaiah Gdoi
10.1016/j.ijpharm.2008.04.025subject
Has Abstractpub_date
2008-08-06 00:00:00pages
96-106issue
1-2eissn
0378-5173issn
1873-3476pii
S0378-5173(08)00313-Xjournal_volume
360pub_type
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journal_title:International journal of pharmaceutics
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journal_title:International journal of pharmaceutics
pub_type: 临床试验,杂志文章
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