Abstract：
:A hybrid silica-liposome nanocapsule system containing insulin has been developed and the encapsulation, protection and release properties are evaluated. The formulation strategy is based on using insulin-loaded 1,2-dipalmitoyl-sn-glycero-3-phosphocholine and cholesterol liposomes as a template for the deposition of inert silica nanoparticles. The influence of formulation and process variables on particle size, zeta potential and liposome entrapment of insulin is reported. The ability to protect against lipolytic degradation and sustain insulin release in vitro in simulated GI conditions is also reported. Depending on the concentration and charge ratio of liposomes and silica nanoparticles, nanoparticle coated liposomes with varied size and zeta potential were obtained with an insulin entrapment efficiency of 70%. The silica nanoparticle coating protected liposomes against degradation by digestive enzymes in vitro; the release rate of insulin from silica coated liposomes was reduced in comparison to uncoated liposomes. Thus the liposomal release kinetics and stability can be controlled by including a specifically engineered nanoparticle layer. Silica nanoparticle-liposomes hybrid nanocapsules show promise as a delivery vehicle for proteins and peptides.
journal_name
Int J Pharmjournal_title
International journal of pharmaceuticsauthors
Mohanraj VJ,Barnes TJ,Prestidge CAdoi
10.1016/j.ijpharm.2010.03.061subject
Has Abstractpub_date
2010-06-15 00:00:00pages
285-93issue
1-2eissn
0378-5173issn
1873-3476pii
S0378-5173(10)00235-8journal_volume
392pub_type
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