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Preparation of redispersible liposomal dry powder using an ultrasonic spray freeze-drying technique for transdermal delivery of human epithelial growth factor

Authors Yin F, Guo S, Gan Y, Zhang X

Received 19 December 2013

Accepted for publication 15 February 2014

Published 31 March 2014 Volume 2014:9(1) Pages 1665—1676


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 3

Fei Yin,1 Shiyan Guo,2 Yong Gan,2 Xinxin Zhang2

1Department of Pharmacy, Liaoning Cancer Hospital and Institute, Shenyang, 2Shanghai Institute of Materia Medica, Chinese Academy of Science, Shanghai, People's Republic of China

Abstract: In this work, an ultrasonic spray freeze-drying (USFD) technique was used to prepare a stable liposomal dry powder for transdermal delivery of recombinant human epithelial growth factor (rhEGF). Morphology, particle size, entrapment efficiency, in vitro release, and skin permeability were systematically compared between rhEGF liposomal dry powder prepared using USFD and that prepared using a conventional lyophilization process. Porous and spherical particles with high specific area were produced under USFD conditions. USFD effectively avoided formation of ice crystals, disruption of the bilayer structure, and drug leakage during the liposome drying process, and maintained the stability of the rhEGF liposomal formulation during storage. The reconstituted rhEGF liposomes prepared from USFD powder did not show significant changes in morphology, particle size, entrapment efficiency, or in vitro release characteristics compared with those of rhEGF liposomes before drying. Moreover, the rhEGF liposomal powder prepared with USFD exhibited excellent enhanced penetration in ex vivo mouse skin compared with that for powder prepared via conventional lyophilization. The results suggest that ultrasonic USFD is a promising technique for the production of stable protein-loaded liposomal dry powder for application to the skin.

Keywords: spray freeze-drying, recombinant human epithelial growth factor, liposomes, skin permeability, transdermal drug delivery

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