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Enhanced dermal delivery of acyclovir using solid lipid nanoparticles

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Abstract

The present investigation was enthused by the possibility to develop solid lipid nanoparticles (SLNs) of hydrophilic drug acyclovir (ACV) and evaluate their potential as the carrier for dermal delivery. ACV-loaded SLNs (ACV-SLNs) were prepared by the optimized double emulsion process using Compritol 888 ATO as solid lipid. The prepared SLNs were smooth and spherical in shape with average diameter, polydispersity index, and entrapment efficiency of 262 ± 13 nm, 0.280 ± 0.01, and 40.08 ± 4.39% at 10% (w/w) theoretical drug loading with respect to Compritol 888 ATO content. Differential scanning calorimetry and powder X-ray diffraction pattern revealed that ACV was present in the amorphous state inside the SLNs. In vitro skin permeation studies on human cadaver and Sprague–Dawley rat skin revealed 17.65 and 15.17 times higher accumulation of ACV-SLNs in the dermal tissues in comparison to commercially available ACV cream after 24 h. Mechanism of topical permeation and dermal distribution was studied qualitatively using confocal laser scanning microscopy. While free dye (calcein) failed to penetrate skin barrier, the same encapsulated in SLNs penetrated deeply into the dermal tissue suggesting that pilosebaceous route was followed by SLNs for skin penetration. Histological examination and transdermal epidermal water loss measurement suggested that no major morphological changes occurred on rat skin surface due to the application of SLNs. Overall, it was concluded that ACV-loaded SLNs might be beneficial in improving dermal delivery of antiviral agent(s) for the treatment of topical herpes simplex infection.

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Acknowledgements

Authors are thankful to NIPER for financial assistance and providing necessary infrastructure facilities and Department of Science and Technology, Government of India, New Delhi, for financial support. Technical assistance rendered by Mr. Dinesh Singh and Mr. Rahul R. Mahajan is also duly acknowledged.

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Authors and Affiliations

  1. Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, SAS Nagar, Mohali, 160062, Punjab, India

    Sanyog Jain, Meghal A. Mistry & Nitin K. Swarnakar

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  1. Sanyog Jain
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Correspondence to Sanyog Jain.

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Jain, S., Mistry, M.A. & Swarnakar, N.K. Enhanced dermal delivery of acyclovir using solid lipid nanoparticles. Drug Deliv. and Transl. Res. 1, 395–406 (2011). https://doi.org/10.1007/s13346-011-0036-0

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