Development and characterisation of modified poloxamer 407 thermoresponsive depot systems containing cubosomes
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Development and characterisation of modified poloxamer 407 thermoresponsive depot systems containing cubosomes. / Kojarunchitt, Thunjiradasiree; Hook, Sarah; Rizwan, Shakila; Rades, Thomas; Baldursdottir, Stefania.
In: International Journal of Pharmaceutics, Vol. 408, No. 1-2, 2011, p. 20-26.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Development and characterisation of modified poloxamer 407 thermoresponsive depot systems containing cubosomes
AU - Kojarunchitt, Thunjiradasiree
AU - Hook, Sarah
AU - Rizwan, Shakila
AU - Rades, Thomas
AU - Baldursdottir, Stefania
N1 - Copyright © 2011 Elsevier B.V. All rights reserved.
PY - 2011
Y1 - 2011
N2 - The purpose of this study is to develop a thermoresponsive sustained release delivery system combining phytantriol cubosomes and poloxamer 407 (P407). P407 undergoes thermoreversible gelation, where it exists as a free-flowing liquid at low temperature and gels upon heating. However, this polymer has the major draw back of fast erosion in aqueous environments which needs to be addressed. Three different concentrations of P407 (12%, 15% and 17% (w/v)) were formulated with various additives (methyl cellulose (MC), dextran, carrageenan and Pluronic-R (25R4)). The rheological characteristics and in vitro stability were investigated. The sol-gel transition temperature of P407 was lowered in the presence of the phytantriol cubosomes. The addition of MC and dextran did not affect the sol-gel transition temperature whereas 25R4 increased the gelation temperature. No transition was observed for the carrageenan formulations. The presence of 25R4 allowed the development of formulations that were free flowing liquid at working temperature (22 °C), gelled at body temperature (37 °C) and had improved stability in an aqueous environment. Both rheological and in vitro stability studies suggested that cubosome-loaded 17% (w/v) P407 with 25R4 in 1:1 molar ratio may have a potential as sustained release delivery system.
AB - The purpose of this study is to develop a thermoresponsive sustained release delivery system combining phytantriol cubosomes and poloxamer 407 (P407). P407 undergoes thermoreversible gelation, where it exists as a free-flowing liquid at low temperature and gels upon heating. However, this polymer has the major draw back of fast erosion in aqueous environments which needs to be addressed. Three different concentrations of P407 (12%, 15% and 17% (w/v)) were formulated with various additives (methyl cellulose (MC), dextran, carrageenan and Pluronic-R (25R4)). The rheological characteristics and in vitro stability were investigated. The sol-gel transition temperature of P407 was lowered in the presence of the phytantriol cubosomes. The addition of MC and dextran did not affect the sol-gel transition temperature whereas 25R4 increased the gelation temperature. No transition was observed for the carrageenan formulations. The presence of 25R4 allowed the development of formulations that were free flowing liquid at working temperature (22 °C), gelled at body temperature (37 °C) and had improved stability in an aqueous environment. Both rheological and in vitro stability studies suggested that cubosome-loaded 17% (w/v) P407 with 25R4 in 1:1 molar ratio may have a potential as sustained release delivery system.
KW - Delayed-Action Preparations
KW - Drug Carriers
KW - Drug Stability
KW - Excipients
KW - Gels
KW - Micelles
KW - Phase Transition
KW - Poloxamer
KW - Rheology
KW - Technology, Pharmaceutical
KW - Temperature
KW - Vaccines
KW - Viscosity
U2 - 10.1016/j.ijpharm.2011.01.037
DO - 10.1016/j.ijpharm.2011.01.037
M3 - Journal article
C2 - 21272624
VL - 408
SP - 20
EP - 26
JO - International Journal of Pharmaceutics
JF - International Journal of Pharmaceutics
SN - 0378-5173
IS - 1-2
ER -
ID: 33229929