当前位置： SCI文献检索 > INTERNATIONAL JOURNAL OF PHARMACEUTICS期刊下所有文献 > Synthesis and characterization of hydrogels formed from a glycidyl methacrylate derivative of galactomannan.

Synthesis and characterization of hydrogels formed from a glycidyl methacrylate derivative of galactomannan.

Abstract：

:The present investigation describes a procedure for the synthesis of a glycidyl methacrylated derivative from galactomannan, GA-MA, and the respective hydrogel formation. The galactomannan (GA), raw material, was purified and dissolved in DMSO. After dissolution, 4-dimethyl-amino-pyridine (DMAP) and glycidyl methacrylate (GMA) were added. The modified polymer, quoted as GA-MA, was purified by precipitation in ethanol. Hydrogels were obtained from GA-MA in aqueous solution by polymerization of GA-MA using sodium persulfate (SP), as initiator, and N,N,N',N'-tetramethylethylenediamine (TEMED), as catalyst. For this, the cross-linking process was trigged by the addition of TEMED and sodium persulfate aqueous solutions. Two different concentrations of TEMED and SP were used. GA, GMA and GA-MA were characterized by FT-IR and NMR (13C and 1H) spectroscopy. The addition of GMA on GA molecules was confirmed through FT-IR results by appearing of a band at nu=1717cm(-1) and also by the cleavage of Cz.dbnd6;C groups of GA-MA (band at nu=1636cm(-1)) during the cross-linking process. The signals attributed to vinyl carbon of methacrylate (delta 138.52, 130.06ppm), to carbonyl (delta 171.87ppm) and to methyl group (delta 20.19ppm) were observed in the 13C NMR spectra of GA-MA. The addition of methacrylate on GA was also confirmed through the signals present in 1H NMR spectra of GA-MA. The formation of hydrogel was observed by complete gelation. The hydrogels were characterized by FT-IR and by measuring the equilibrium water content (EWC) in pH=7.0 and 1.0. The hydrogels contain 83wt.% of water at 25 degrees C and 85wt.% at 37 degrees C. Good resistance to degradation in acidic conditions, pH=1.0, was observed at 37 degrees C up to 48h. These properties suggest that the GA-MA hydrogels may be a new material for pharmaceutical use, mainly for drug delivery system.

journal_name

Int J Pharm

journal_title

International journal of pharmaceutics

authors

Reis AV,Cavalcanti OA,Rubira AF,Muniz EC

doi

10.1016/j.ijpharm.2003.08.001

keywords:

subject

Has Abstract

pub_date

2003-11-28 00:00:00

pages

13-25

issue

1-2

eissn

0378-5173

issn

1873-3476

pii

S0378517303004150

journal_volume

267

pub_type

杂志文章

在线工具

Synthesis and characterization of hydrogels formed from a glycidyl methacrylate derivative of galactomannan.