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Novel lipid-based formulations enhancing the in vitro dissolution and permeability characteristics of a poorly water-soluble model drug, piroxicam.
Int J Pharm. 2005 Sep 14; 301(1-2):209-16.IJ

Abstract

Lipid-based delivery systems are becoming increasingly popular as carriers of drugs due to their ability to overcome barriers to oral absorption. The purpose of this study was to prepare novel lipid-based formulations of a model drug, piroxicam (PXCM), a poorly water-soluble non-steroidal anti-inflammatory drug (NSAID) using 1,2-dimyristoyl-sn-glycero-3-phosphatidylcholine (DMPC) phospholipid alone, and in combination with polyethylene glycol (PEG 4600). Lipid-based drug delivery systems were prepared using conventional methods of preparation and the following aspects were evaluated (1) in vitro dissolution behavior, (2) absorption via Caco-2 cell monolayers and (3) stability of formulations over a 12-month period. In addition, physical characterization studies using differential scanning calorimetry (DSC) were also performed. Formulations of PXCM were prepared using DMPC in the following combinations (A) 1:1 and (B) 2:1 and a mixture of DMPC and PEG 4600 (C) 2:1:1, respectively. Dissolution studies conducted in phosphate buffered saline (PBS, pH 7.4, 37+/-0.5 degrees C) using the USP type II (paddle) dissolution apparatus showed an increase in dissolution rate and extent of the PXCM from all solid dispersion formulations when compared to the control. As such, the rate of drug release was observed to be fastest with formulation (C) showing the greatest increase of over two-fold compared to the control. Release of PXCM from formulations (A) and (B) was intermediate with the latter showing superior dissolution behavior despite containing lower amounts of the carrier lipid than the former. This observation indicates a possible existence of threshold levels for phospholipids carriers beyond which dissolution could be adversely affected. DSC studies further confirmed the dissolution behavior of these formulations demonstrating different levels of amorphous to crystalline nature. Results of HPLC analysis from Caco-2 cell culture studies showed increase in transport of PXCM from all formulations, with formulation (C) showing the maximum increase followed by formulations (B) and (A), when compared to control. The apparent permeability coefficients (Papp) were calculated to be 7.92x10(-6), 9.48x10(-6), 9.2x10(-6) and 5.6x10(-6)cm/s for formulations (A)-(C) and control, respectively. Overall, permeation appeared to improve for all formulations over the control. Stability studies at various temperatures showed all formulations to have good stability for the first 6 months; then a decline in dissolution rates was observed, especially for PEG-based lipid carrier systems, attributed to the increase in crystalline content of the solid dispersions upon storage.

Authors+Show Affiliations

College of Pharmacy, Western University of Health Sciences, Pomona, CA 91766, USA. sprabhu@westernu.eduNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

16046087

Citation

Prabhu, Sunil, et al. "Novel Lipid-based Formulations Enhancing the in Vitro Dissolution and Permeability Characteristics of a Poorly Water-soluble Model Drug, Piroxicam." International Journal of Pharmaceutics, vol. 301, no. 1-2, 2005, pp. 209-16.
Prabhu S, Ortega M, Ma C. Novel lipid-based formulations enhancing the in vitro dissolution and permeability characteristics of a poorly water-soluble model drug, piroxicam. Int J Pharm. 2005;301(1-2):209-16.
Prabhu, S., Ortega, M., & Ma, C. (2005). Novel lipid-based formulations enhancing the in vitro dissolution and permeability characteristics of a poorly water-soluble model drug, piroxicam. International Journal of Pharmaceutics, 301(1-2), 209-16.
Prabhu S, Ortega M, Ma C. Novel Lipid-based Formulations Enhancing the in Vitro Dissolution and Permeability Characteristics of a Poorly Water-soluble Model Drug, Piroxicam. Int J Pharm. 2005 Sep 14;301(1-2):209-16. PubMed PMID: 16046087.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Novel lipid-based formulations enhancing the in vitro dissolution and permeability characteristics of a poorly water-soluble model drug, piroxicam. AU - Prabhu,Sunil, AU - Ortega,Maru, AU - Ma,Chan, PY - 2004/10/11/received PY - 2005/03/29/revised PY - 2005/05/23/accepted PY - 2005/7/28/pubmed PY - 2006/1/7/medline PY - 2005/7/28/entrez SP - 209 EP - 16 JF - International journal of pharmaceutics JO - Int J Pharm VL - 301 IS - 1-2 N2 - Lipid-based delivery systems are becoming increasingly popular as carriers of drugs due to their ability to overcome barriers to oral absorption. The purpose of this study was to prepare novel lipid-based formulations of a model drug, piroxicam (PXCM), a poorly water-soluble non-steroidal anti-inflammatory drug (NSAID) using 1,2-dimyristoyl-sn-glycero-3-phosphatidylcholine (DMPC) phospholipid alone, and in combination with polyethylene glycol (PEG 4600). Lipid-based drug delivery systems were prepared using conventional methods of preparation and the following aspects were evaluated (1) in vitro dissolution behavior, (2) absorption via Caco-2 cell monolayers and (3) stability of formulations over a 12-month period. In addition, physical characterization studies using differential scanning calorimetry (DSC) were also performed. Formulations of PXCM were prepared using DMPC in the following combinations (A) 1:1 and (B) 2:1 and a mixture of DMPC and PEG 4600 (C) 2:1:1, respectively. Dissolution studies conducted in phosphate buffered saline (PBS, pH 7.4, 37+/-0.5 degrees C) using the USP type II (paddle) dissolution apparatus showed an increase in dissolution rate and extent of the PXCM from all solid dispersion formulations when compared to the control. As such, the rate of drug release was observed to be fastest with formulation (C) showing the greatest increase of over two-fold compared to the control. Release of PXCM from formulations (A) and (B) was intermediate with the latter showing superior dissolution behavior despite containing lower amounts of the carrier lipid than the former. This observation indicates a possible existence of threshold levels for phospholipids carriers beyond which dissolution could be adversely affected. DSC studies further confirmed the dissolution behavior of these formulations demonstrating different levels of amorphous to crystalline nature. Results of HPLC analysis from Caco-2 cell culture studies showed increase in transport of PXCM from all formulations, with formulation (C) showing the maximum increase followed by formulations (B) and (A), when compared to control. The apparent permeability coefficients (Papp) were calculated to be 7.92x10(-6), 9.48x10(-6), 9.2x10(-6) and 5.6x10(-6)cm/s for formulations (A)-(C) and control, respectively. Overall, permeation appeared to improve for all formulations over the control. Stability studies at various temperatures showed all formulations to have good stability for the first 6 months; then a decline in dissolution rates was observed, especially for PEG-based lipid carrier systems, attributed to the increase in crystalline content of the solid dispersions upon storage. SN - 0378-5173 UR - https://www.unboundmedicine.com/medline/citation/16046087/Novel_lipid_based_formulations_enhancing_the_in_vitro_dissolution_and_permeability_characteristics_of_a_poorly_water_soluble_model_drug_piroxicam_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0378-5173(05)00346-7 DB - PRIME DP - Unbound Medicine ER -