Continuous Generation of Ethyl Cellulose Drug Delivery Nanocarriers from Microbubbles
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To investigate a new microfluidic method for the continuous preparation of hollow-shell nanoparticles of a hydrophobic polymer and the simultaneous encapsulation within these of a hydrophilic active pharmaceutical ingredient.
A specially designed and constructed microfluidic device which facilitates at a junction the impingement of two liquids flowing in capillaries kept 60° apart, one containing the polymer ethyl cellulose (EC) and the other active pharmaceutical ingredient amoxicillin, and a gas flowing in a capillary bisecting the two liquid flows, was used to continuously generate EC coated microbubbles at an outlet directly below the gas flow. The bubbles produce EC nanoparticles whilst encapsulating amoxicillin, and these were characterised by microscopy, zeta potential measurements, FTIR and UV spectroscopy and in vitro drug release and kinetic studies.
The device produced ~5 × 106 microbubbles per minute from the surface of which EC nanocarriers were released spontaneously according to an evaporation-controlled mechanism. The gas pressure was very effective in controlling the size and size distribution of the nanocarriers.
Nanocarriers with diameter between 10 and 800 nm were continuously produced by controlling the gas pressure between 110 and 510 kPa. Depending on their size, particles were capable of encapsulating 65–88% of amoxicillin which was released over ~12 h.
KEY WORDSbubbles drug delivery microfluidic nanocarriers
Acknowledgments and Disclosures
The authors wish to thank the Islamic Development Bank for supporting the doctoral research programme of Oguzhan Gunduz. They would also like to thank Kevin Reeves for the help with the scanning electron microscopes in the Archaeology Department at UCL and Dr Suguo Huo of the London Centre for Nanotechnology for the use of FIB.
- 18.Murtaza G. Ethylcellulose microparticles: a review. Acta Poloniae Pharm Drug Res. 2012;69:11–22.Google Scholar
- 21.Khan SA, Ahmad M, Murtaza G, Aamir MN, Madni A, Kousar R, Minhas U. Development of a single combined microencapsulated formulation of allopurinol and nimesulide and investigation of their release behaviours. Ars Pharm. 2010;51:105–16.Google Scholar
- 22.Hu L, Liu W, Li L, Zhao J, Yang X. Preparation and in vitro, in vivo evaluation of clarithromycin microcapsules. J Basic Clin Pharm. 2011;2:1–9.Google Scholar
- 27.Huang L-Y, Yu D-G, Branford-White C, Zhu L-M. Sustained release of ethyl cellulose micro-particle drug delivery systems prepared using electrospraying. J Mater Sci. 2012;47:1372–7.Google Scholar
- 31.Wagh SC, Kumar JS, Banerjee S. Development and evaluation of a novel extended release venlafaxine hydrochloride matrix tablets. J Pharm Res. 2012;5:2184–90.Google Scholar
- 32.Pahwa R, Chhabra L, Lamba AK, Jindal S, Rathour A. Formulation and in-vitro evaluation of effervescent floating tablets of an antiulcer agent. J Chem Pharm Res. 2012;4:1066–73.Google Scholar
- 33.Bohr A, Kristensen J, Dyas M, Edirisinghe M, Stride E. Release profile and characteristics of electrosprayed particles for oral delivery of a practically insoluble drug. J R Soc Interface. 2012. doi: 10.1098/rsif.2012.0166.