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Drug permeability across the buccal ...

Kokate, Amit.

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Drug permeability across the buccal mucosa: Role of ionized species activity and development of a predictive model.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Drug permeability across the buccal mucosa: Role of ionized species activity and development of a predictive model./
Author:	Kokate, Amit.
Description:	158 p.
Notes:	Adviser: Bhaskara Jasti.
Contained By:	Dissertation Abstracts International68-08B.
Subject:	Chemistry, Pharmaceutical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3280760
ISBN:	9780549191988

Drug permeability across the buccal mucosa: Role of ionized species activity and development of a predictive model.
Kokate, Amit.

Drug permeability across the buccal mucosa: Role of ionized species activity and development of a predictive model. - 158 p.

Adviser: Bhaskara Jasti.

Thesis (Ph.D.)--University of the Pacific, 2007.

Based on the biochemical composition and structure of the buccal mucosa, drugs can permeate by the lipoidal and/or aqueous pathways. In this regard, the buccal mucosa is similar to skin. As the unionized drug form is the major permeant across skin, flux depends predominantly on the thermodynamic activity of this species. In contrast, ionized drug has been demonstrated to contribute significantly to the permeability across the buccal mucosa due to the presence of large amounts of polar lipids. The contributions of the individual activities of these species is however, not known. Therefore, the first objective of this study was to delineate the thermodynamic activities of ionized and unionized species and to determine their role in governing the total flux across buccal membrane. The flux of model acidic (nimesulide) and basic (bupivacaine) drugs across buccal mucosa either increased (nimesulide) or decreased (bupivacaine) with pH under saturated conditions depending on an increase (nimesulide) or decrease (bupivacaine) in the degree of saturation of ionized species (DS ionized). At sub-saturated drug concentrations, a decrease in nimesulide flux and an increase in bupivacaine flux were observed with pH due to corresponding changes in DSunionized. For nimesulide and bupivacaine, the contributions of the ionized and unionized species to total flux are equal when 90% of the drug is in the ionized form. In conclusion, the contribution of the ionized form activity to flux was significant.

ISBN: 9780549191988Subjects--Topical Terms:

550957
Chemistry, Pharmaceutical.

Drug permeability across the buccal mucosa: Role of ionized species activity and development of a predictive model.
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035 $a (UMI)AAI3280760
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100 1 $a Kokate, Amit. $3 1262919
245 1 0 $a Drug permeability across the buccal mucosa: Role of ionized species activity and development of a predictive model.
300 $a 158 p.
500 $a Adviser: Bhaskara Jasti.
500 $a Source: Dissertation Abstracts International, Volume: 68-08, Section: B, page: 5249.
502 $a Thesis (Ph.D.)--University of the Pacific, 2007.
520 $a Based on the biochemical composition and structure of the buccal mucosa, drugs can permeate by the lipoidal and/or aqueous pathways. In this regard, the buccal mucosa is similar to skin. As the unionized drug form is the major permeant across skin, flux depends predominantly on the thermodynamic activity of this species. In contrast, ionized drug has been demonstrated to contribute significantly to the permeability across the buccal mucosa due to the presence of large amounts of polar lipids. The contributions of the individual activities of these species is however, not known. Therefore, the first objective of this study was to delineate the thermodynamic activities of ionized and unionized species and to determine their role in governing the total flux across buccal membrane. The flux of model acidic (nimesulide) and basic (bupivacaine) drugs across buccal mucosa either increased (nimesulide) or decreased (bupivacaine) with pH under saturated conditions depending on an increase (nimesulide) or decrease (bupivacaine) in the degree of saturation of ionized species (DS ionized). At sub-saturated drug concentrations, a decrease in nimesulide flux and an increase in bupivacaine flux were observed with pH due to corresponding changes in DSunionized. For nimesulide and bupivacaine, the contributions of the ionized and unionized species to total flux are equal when 90% of the drug is in the ionized form. In conclusion, the contribution of the ionized form activity to flux was significant.
520 $a A lack of a specific model for predicting buccal permeability has led to the use of transdermal models such as the Potts-Guy model. However, it is hypothesized that based on the above conclusion, this model might lead to erroneous permeability predictions. In the second part of this dissertation, a specific model was developed and validated by performing permeation studies of 15 small molecules across porcine buccal mucosa. Molecular volume, lipophilicity, number of hydrogen bond donors and number of rotatable bonds were found to be the most significant descriptors governing buccal permeability (logK p) based on stepwise regression analysis. An excellent fit with an adjusted R2 of 0.946 and a Q2 of 0.882 were obtained. A good correlation was observed between the observed and predicted logKp values for an external data set.
590 $a School code: 0173.
650 4 $a Chemistry, Pharmaceutical. $3 550957
650 4 $a Health Sciences, Pharmacology. $3 1017717
690 $a 0419
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710 2 0 $a University of the Pacific. $3 1024038
773 0 $t Dissertation Abstracts International $g 68-08B.
790 $a 0173
790 1 0 $a Jasti, Bhaskara, $e advisor
791 $a Ph.D.
792 $a 2007
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