N-octyl-N-arginine-chitosan (OACS) micelles for gambogic acid oral delivery: preparation, characterization and its study on in situ intestinal perfusion. (June 2014)

• Record Type: Journal Article
• Authors: Yu, Fan; He, Chenghua; Waddad, Ayman Y.; Munyendo, Were L. L.; Lv, Huixia; Zhou, Jianping; Zhang, Qiang
• Is Part Of: Drug development and industrial pharmacy. Volume 40:Number 6(2014:Jun.)
• Page Start: 774
• Page End: 782
• Publication Date: 2014-06
• Subjects: Pharmaceutical chemistry -- Periodicals; Pharmaceutical industry -- Periodicals; Drug Industry -- Periodicals; Technology, Pharmaceutical -- Periodicals; 615.05
• DOI: 10.3109/03639045.2013.786723
• Languages: English
• ISSNs: 0363-9045

Abstract

<abstract> <title>Abstract</title> <p> <italic>Context</italic>: Gambogic acid (GA) can inhibit the growth of various cancer cells. However, the low bioavailability caused by insolubility, limits its clinical application. L-arginine is always used with GA to form a complex to obtain the higher solubility. Moreover, guanidyl group from arginine, which can facilitate the cellular uptake, was identified.</p> <p> <italic>Objective</italic>: In this study, L-arginine and chitosan (CS) were used for the first time to prepare N-octyl-N-arginine CS (OACS), a novel amphiphilic carrier for GA with solubility- and absorption-enhancing functions; the characterization of the GA loaded OACS micelles (GA-OACS) and its absorption-enhancing effect were also investigated.</p> <p> <italic>Materials and methods</italic>: GA-OACS were prepared by the dialysis method. The formed micelles were characterized and evaluated by atomic force microscope (AFM), dynamic light scattering, differential scanning calorimeter (DSC), solubility test, <italic>in vitro</italic> release and <italic>in situ</italic> intestinal perfusion.</p> <p> <italic>Results</italic>: The GA-OACS micelles were successfully prepared attaining a 35.3% drug loading and 82.2% entrapment efficiency. GA-OACS had a homogeneous particle size of 160.3 nm; +21.8 mv zeta potential with smooth continuous surface was observed by using AFM. DSC diagram suggested that GA was encapsulated in the micelles. Meanwhile, GA encapsulated in micelles exhibited a desirable slow release <italic>in vitro</italic> experiment. The solubility of GA in OACS micelles was increased up to 3.16 ± 0.13 mg/mL, 2320 times than that of free GA. The single pass perfusion showed that the absorption of GA-OACS micelles was enhanced 3.6-fold, 2.1-fold and 2.2-fold for jejunum, ileum and colon, respectively.</p> <p> <italic>Discussion and conclusion</italic>: OACS provided excellent ability of drug loading, increasing solubility and enhanced absorption for GA, which indicated that OACS micelles as an oral drug delivery carrier may have potential research and application values.</p> </abstract>