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Preparation of SLN-containing Thermoresponsive In-situ Forming Gel as a Controlled Nanoparticle Delivery System and Investigating its Rheological, Thermal and Erosion Behavior.

Dorraj G, Moghimi HR - Iran J Pharm Res (2015)

Bottom Line: Due to their rapid clearance from systemic circulation, nanoparticles do not provide sustained action in most cases.However, gelling kinetic did not change significantly after addition of SLN.Present results indicate potential of sol-gel systems for controlled nanoparticle delivery and show that SLN affects properties of the system.

View Article: PubMed Central - PubMed

Affiliation: Department of Pharmaceutics and Nanotechnology, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran.

ABSTRACT
Various nanoparticles have been investigated as novel drug delivery systems, including solid lipid nanoparticles (SLNs). Due to their rapid clearance from systemic circulation, nanoparticles do not provide sustained action in most cases. Different strategies have been employed to overcome this problem. In this direction, the present study introduces erodible in-situ forming gel systems as potential vehicles for prolonged release of SLNs. SLNs were prepared by solidification of an oil-in-water microemulsion containing stearic acid, surfactants and co-surfactants. Nanoparticles were then dispersed in a thermosensitive Poloxamer 407 aqueous solution (sol) at 4 °C and their effects on gel forming ability, sol-gel transition and rheological behavior of the system were investigated over 5-50 °C. Thermal behavior of the system was investigated by differential scanning calorimetry too. Erosion rate of the gel in the presence and absence of SLN was measured by gravimetric method. Integrity of SLNs in the system was investigated by scanning electron microscopy (SEM) and particle size analysis. SLN showed particle size and zeta potential of 130 ± 1.39 nm and - 44 ± 2.1 mV respectively. Particle size analysis and SEM studies after gel erosion revealed presence of intact SLN in the hydrogel. SLN reduced erosion rate of Poloxamer gel and increased its sol-gel transition temperature from 26 to 29 °C. However, gelling kinetic did not change significantly after addition of SLN. Damping factor <1 indicated stability of the SLN-containing system. Present results indicate potential of sol-gel systems for controlled nanoparticle delivery and show that SLN affects properties of the system.

No MeSH data available.


Related in: MedlinePlus

Relationship between the viscosity and temperature for 20% (w/v) solution of Poloxamer 407 containing 20 mL SLN dispersion
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Figure 5: Relationship between the viscosity and temperature for 20% (w/v) solution of Poloxamer 407 containing 20 mL SLN dispersion

Mentions: Evaluation of rheological properties is very useful in physicochemical characterization of gel formulations and help understanding their process of thermal gelling in-situ. Figure 4 and Figure 5 show viscosity of Poloxamer 407 solutions as a function of temperatures for plain and SLN-containing systems respectively. Both systems showed a constant viscosity upto about 15 °C, but their viscosities increased as the temperature elevated. After gel formation (sol-gel transition) viscosity became constant again. Based on these results, the sol-gel transition temperature of plain and SLN-containing system, which is equal to maximum viscosity of the system, was measured to be 26 °C and 29 °C respectively which shows good agreement with stirring test results.


Preparation of SLN-containing Thermoresponsive In-situ Forming Gel as a Controlled Nanoparticle Delivery System and Investigating its Rheological, Thermal and Erosion Behavior.

Dorraj G, Moghimi HR - Iran J Pharm Res (2015)

Relationship between the viscosity and temperature for 20% (w/v) solution of Poloxamer 407 containing 20 mL SLN dispersion
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4403051&req=5

Figure 5: Relationship between the viscosity and temperature for 20% (w/v) solution of Poloxamer 407 containing 20 mL SLN dispersion
Mentions: Evaluation of rheological properties is very useful in physicochemical characterization of gel formulations and help understanding their process of thermal gelling in-situ. Figure 4 and Figure 5 show viscosity of Poloxamer 407 solutions as a function of temperatures for plain and SLN-containing systems respectively. Both systems showed a constant viscosity upto about 15 °C, but their viscosities increased as the temperature elevated. After gel formation (sol-gel transition) viscosity became constant again. Based on these results, the sol-gel transition temperature of plain and SLN-containing system, which is equal to maximum viscosity of the system, was measured to be 26 °C and 29 °C respectively which shows good agreement with stirring test results.

Bottom Line: Due to their rapid clearance from systemic circulation, nanoparticles do not provide sustained action in most cases.However, gelling kinetic did not change significantly after addition of SLN.Present results indicate potential of sol-gel systems for controlled nanoparticle delivery and show that SLN affects properties of the system.

View Article: PubMed Central - PubMed

Affiliation: Department of Pharmaceutics and Nanotechnology, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran.

ABSTRACT
Various nanoparticles have been investigated as novel drug delivery systems, including solid lipid nanoparticles (SLNs). Due to their rapid clearance from systemic circulation, nanoparticles do not provide sustained action in most cases. Different strategies have been employed to overcome this problem. In this direction, the present study introduces erodible in-situ forming gel systems as potential vehicles for prolonged release of SLNs. SLNs were prepared by solidification of an oil-in-water microemulsion containing stearic acid, surfactants and co-surfactants. Nanoparticles were then dispersed in a thermosensitive Poloxamer 407 aqueous solution (sol) at 4 °C and their effects on gel forming ability, sol-gel transition and rheological behavior of the system were investigated over 5-50 °C. Thermal behavior of the system was investigated by differential scanning calorimetry too. Erosion rate of the gel in the presence and absence of SLN was measured by gravimetric method. Integrity of SLNs in the system was investigated by scanning electron microscopy (SEM) and particle size analysis. SLN showed particle size and zeta potential of 130 ± 1.39 nm and - 44 ± 2.1 mV respectively. Particle size analysis and SEM studies after gel erosion revealed presence of intact SLN in the hydrogel. SLN reduced erosion rate of Poloxamer gel and increased its sol-gel transition temperature from 26 to 29 °C. However, gelling kinetic did not change significantly after addition of SLN. Damping factor <1 indicated stability of the SLN-containing system. Present results indicate potential of sol-gel systems for controlled nanoparticle delivery and show that SLN affects properties of the system.

No MeSH data available.


Related in: MedlinePlus