A dynamic in vitro permeation study on solid mono- and diacyl-phospholipid dispersions of celecoxib

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The current study documents enhanced apparent solubility of the BCS class II drug celecoxib (CXB) when formulated as solid phospholipid dispersion (SPD) with either mono- or diacyl-phospholipids by freeze drying from hydro-alcoholic solvent. The enhanced solubility upon dispersion in buffer or fasted state simulated intestinal fluid (FaSSIF) is interpreted to be due to two effects: (1) amorphization of CXB, inducing supersaturation, which is also observed when CXB is freeze dried in the absence of phospholipids and (2) association of CXB with spontaneously forming colloidal structures, such as vesicles and/or micelles, promoting solubilization. The latter effect depended on the CXB-to-phospholipid ratio, where monoacyl-phospholipid was a more efficient solubilizer than diacyl-phospholipid. In the case of diacyl-phospholipid, solubilization also depended strongly on the dispersion medium, where FaSSIF induced a more pronounced solubilization effect than buffer. In contrast, a significantly enhanced in-vitro permeability of CXB across a biomimetic barrier (Permeapad®) was found only with low lipid contents up to a CXB to phospholipid mass-ratio of 1:10 or in the absence of phospholipid; above this critical ratio, permeability was not enhanced, i.e. comparable to that observed with a suspension of non-processed (crystalline) drug. This non-linear dissolution-/permeation-behavior was observed independently of (1) the type of phospholipid (monoacyl- or diacyl-) employed and (2) the dispersion medium (buffer or FaSSIF), despite the fact that different patterns of co-existing colloidal states were observed from mono-/diacyl-phospholipid formulations in buffer/FaSSIF (small bile salt micelles, intermediate size mixed micelles and large vesicular structures), assessed by asymmetric flow field-flow fractionation/multi angle laser light scattering. A uniform mechanistic hypothesis is presented to describe the impact of phospholipids on CXB permeation behavior: Obviously, the critical drug-to-phospholipid ratio represents a compromise between optimal stabilization of the amorphous state-induced supersaturation and reduced thermodynamic activity of CXB due to association with colloidal states, where the type of colloidal state (vesicle or micelle) appears to be of minor importance.

LanguageEnglish
JournalEuropean Journal of Pharmaceutical Sciences
Volume127
Pages199-207
ISSN0928-0987
DOIs
Publication statusPublished - Jan 2019

Fingerprint

Celecoxib
Phospholipids
Micelles
In Vitro Techniques
Field Flow Fractionation

Cite this

@article{975046523f1d4f5a9ceaedef79798756,
title = "A dynamic in vitro permeation study on solid mono- and diacyl-phospholipid dispersions of celecoxib",
abstract = "The current study documents enhanced apparent solubility of the BCS class II drug celecoxib (CXB) when formulated as solid phospholipid dispersion (SPD) with either mono- or diacyl-phospholipids by freeze drying from hydro-alcoholic solvent. The enhanced solubility upon dispersion in buffer or fasted state simulated intestinal fluid (FaSSIF) is interpreted to be due to two effects: (1) amorphization of CXB, inducing supersaturation, which is also observed when CXB is freeze dried in the absence of phospholipids and (2) association of CXB with spontaneously forming colloidal structures, such as vesicles and/or micelles, promoting solubilization. The latter effect depended on the CXB-to-phospholipid ratio, where monoacyl-phospholipid was a more efficient solubilizer than diacyl-phospholipid. In the case of diacyl-phospholipid, solubilization also depended strongly on the dispersion medium, where FaSSIF induced a more pronounced solubilization effect than buffer. In contrast, a significantly enhanced in-vitro permeability of CXB across a biomimetic barrier (Permeapad{\circledR}) was found only with low lipid contents up to a CXB to phospholipid mass-ratio of 1:10 or in the absence of phospholipid; above this critical ratio, permeability was not enhanced, i.e. comparable to that observed with a suspension of non-processed (crystalline) drug. This non-linear dissolution-/permeation-behavior was observed independently of (1) the type of phospholipid (monoacyl- or diacyl-) employed and (2) the dispersion medium (buffer or FaSSIF), despite the fact that different patterns of co-existing colloidal states were observed from mono-/diacyl-phospholipid formulations in buffer/FaSSIF (small bile salt micelles, intermediate size mixed micelles and large vesicular structures), assessed by asymmetric flow field-flow fractionation/multi angle laser light scattering. A uniform mechanistic hypothesis is presented to describe the impact of phospholipids on CXB permeation behavior: Obviously, the critical drug-to-phospholipid ratio represents a compromise between optimal stabilization of the amorphous state-induced supersaturation and reduced thermodynamic activity of CXB due to association with colloidal states, where the type of colloidal state (vesicle or micelle) appears to be of minor importance.",
author = "Ann-Christin Jacobsen and Elvang, {Philipp Alexander} and Annette Bauer-Brandl and Martin Brandl",
note = "Copyright {\circledC} 2018. Published by Elsevier B.V.",
year = "2019",
month = "1",
doi = "10.1016/j.ejps.2018.11.003",
language = "English",
volume = "127",
pages = "199--207",
journal = "European Journal of Pharmaceutical Sciences",
issn = "0928-0987",
publisher = "Elsevier",

}

A dynamic in vitro permeation study on solid mono- and diacyl-phospholipid dispersions of celecoxib. / Jacobsen, Ann-Christin; Elvang, Philipp Alexander; Bauer-Brandl, Annette; Brandl, Martin.

In: European Journal of Pharmaceutical Sciences, Vol. 127, 01.2019, p. 199-207.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - A dynamic in vitro permeation study on solid mono- and diacyl-phospholipid dispersions of celecoxib

AU - Jacobsen, Ann-Christin

AU - Elvang, Philipp Alexander

AU - Bauer-Brandl, Annette

AU - Brandl, Martin

N1 - Copyright © 2018. Published by Elsevier B.V.

PY - 2019/1

Y1 - 2019/1

N2 - The current study documents enhanced apparent solubility of the BCS class II drug celecoxib (CXB) when formulated as solid phospholipid dispersion (SPD) with either mono- or diacyl-phospholipids by freeze drying from hydro-alcoholic solvent. The enhanced solubility upon dispersion in buffer or fasted state simulated intestinal fluid (FaSSIF) is interpreted to be due to two effects: (1) amorphization of CXB, inducing supersaturation, which is also observed when CXB is freeze dried in the absence of phospholipids and (2) association of CXB with spontaneously forming colloidal structures, such as vesicles and/or micelles, promoting solubilization. The latter effect depended on the CXB-to-phospholipid ratio, where monoacyl-phospholipid was a more efficient solubilizer than diacyl-phospholipid. In the case of diacyl-phospholipid, solubilization also depended strongly on the dispersion medium, where FaSSIF induced a more pronounced solubilization effect than buffer. In contrast, a significantly enhanced in-vitro permeability of CXB across a biomimetic barrier (Permeapad®) was found only with low lipid contents up to a CXB to phospholipid mass-ratio of 1:10 or in the absence of phospholipid; above this critical ratio, permeability was not enhanced, i.e. comparable to that observed with a suspension of non-processed (crystalline) drug. This non-linear dissolution-/permeation-behavior was observed independently of (1) the type of phospholipid (monoacyl- or diacyl-) employed and (2) the dispersion medium (buffer or FaSSIF), despite the fact that different patterns of co-existing colloidal states were observed from mono-/diacyl-phospholipid formulations in buffer/FaSSIF (small bile salt micelles, intermediate size mixed micelles and large vesicular structures), assessed by asymmetric flow field-flow fractionation/multi angle laser light scattering. A uniform mechanistic hypothesis is presented to describe the impact of phospholipids on CXB permeation behavior: Obviously, the critical drug-to-phospholipid ratio represents a compromise between optimal stabilization of the amorphous state-induced supersaturation and reduced thermodynamic activity of CXB due to association with colloidal states, where the type of colloidal state (vesicle or micelle) appears to be of minor importance.

AB - The current study documents enhanced apparent solubility of the BCS class II drug celecoxib (CXB) when formulated as solid phospholipid dispersion (SPD) with either mono- or diacyl-phospholipids by freeze drying from hydro-alcoholic solvent. The enhanced solubility upon dispersion in buffer or fasted state simulated intestinal fluid (FaSSIF) is interpreted to be due to two effects: (1) amorphization of CXB, inducing supersaturation, which is also observed when CXB is freeze dried in the absence of phospholipids and (2) association of CXB with spontaneously forming colloidal structures, such as vesicles and/or micelles, promoting solubilization. The latter effect depended on the CXB-to-phospholipid ratio, where monoacyl-phospholipid was a more efficient solubilizer than diacyl-phospholipid. In the case of diacyl-phospholipid, solubilization also depended strongly on the dispersion medium, where FaSSIF induced a more pronounced solubilization effect than buffer. In contrast, a significantly enhanced in-vitro permeability of CXB across a biomimetic barrier (Permeapad®) was found only with low lipid contents up to a CXB to phospholipid mass-ratio of 1:10 or in the absence of phospholipid; above this critical ratio, permeability was not enhanced, i.e. comparable to that observed with a suspension of non-processed (crystalline) drug. This non-linear dissolution-/permeation-behavior was observed independently of (1) the type of phospholipid (monoacyl- or diacyl-) employed and (2) the dispersion medium (buffer or FaSSIF), despite the fact that different patterns of co-existing colloidal states were observed from mono-/diacyl-phospholipid formulations in buffer/FaSSIF (small bile salt micelles, intermediate size mixed micelles and large vesicular structures), assessed by asymmetric flow field-flow fractionation/multi angle laser light scattering. A uniform mechanistic hypothesis is presented to describe the impact of phospholipids on CXB permeation behavior: Obviously, the critical drug-to-phospholipid ratio represents a compromise between optimal stabilization of the amorphous state-induced supersaturation and reduced thermodynamic activity of CXB due to association with colloidal states, where the type of colloidal state (vesicle or micelle) appears to be of minor importance.

U2 - 10.1016/j.ejps.2018.11.003

DO - 10.1016/j.ejps.2018.11.003

M3 - Journal article

VL - 127

SP - 199

EP - 207

JO - European Journal of Pharmaceutical Sciences

T2 - European Journal of Pharmaceutical Sciences

JF - European Journal of Pharmaceutical Sciences

SN - 0928-0987

ER -