Integrity and stability of oral liposomes containing bile salts studied in simulated and ex vivo gastrointestinal media.

Abstract:

:The objective of this study was to investigate the integrtity and stability of oral liposomes containing glycocholate (SGC-Lip) in simulated gastrointestinal (GI) media and ex vivo GI media from rats in comparison with conventional liposomes (CH-Lip) composed of soybean phosphatidylcholine and cholesterol. Membrane integrity of liposomes was evaluated by monitoring calcein release, particle size and distribution in different simulated GI media. The stability of liposomes encapsulating insulin was investigated in simulated GI fluids containing pepsin or pancreatin and ex vivo GI enzyme fluids. Simulated GI media with low pH or physiological bile salts resulted in significant increase in calcein release, but dynamic laser scattering data showed that the size and distribution were generally stable. SGC-Lip retained the major amount of the initially encapsulated insulin as compared with CH-Lip in simulated GI fluids (SGF, FaSSGF, SIF and FeSSIF-V2). SGC-Lip retained respectively 17.1% and 20.5% of the initially encapsulated insulin in ex vivo GI fluid, which were also significantly more than CH-Lip. These results suggested that SGC-Lip could protect insulin from degradation to some degree during their transit through the gastrointestinal tract and contributed to enhanced oral absorption.

journal_name

Int J Pharm

authors

Hu S,Niu M,Hu F,Lu Y,Qi J,Yin Z,Wu W

doi

10.1016/j.ijpharm.2012.10.025

subject

Has Abstract

pub_date

2013-01-30 00:00:00

pages

693-700

issue

1-2

eissn

0378-5173

issn

1873-3476

pii

S0378-5173(12)00965-9

journal_volume

441

pub_type

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