Gastric resistant microbeads of metal ion cross-linked carboxymethyl guar gum for oral drug delivery

被引:57
|
作者
Reddy, T [1 ]
Tammishetti, S [1 ]
机构
[1] Indian Inst Chem Technol, Organ Coatings & Polymers Div, Hyderabad 500007, Andhra Pradesh, India
关键词
carboxymethyl guar gum; gastric resistant; controlled release; micro particles; microencapsulation;
D O I
10.1080/02652040110081389
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Ionic cross-linking of sodium carboxymethyl guar gum as a mild method for microencapsulation of sensitive drugs, like proteins, is presented. When a solution of sodium salt of carboxymethyl guar gum, containing BSA as a model drug, is added, as droplets, to different multivalent metal ion solutions, they get cross-linked to form insoluble microbeads. The amount of protein retained, morphology of the resulting beads and the subsequent release of the retained protein is simulated intestinal fluids varied with the type of metal ion as well as it's concentration. Trivalent metal ions like Al+++ and Fe+++ were found to be superior to divalent metal ions like Ba++, Ca++, Cu++ and Cd++. The optimum concentration around which these ions provide maximum drug retention was found to be much lower for trivalent ions. Beads cross-linked with them released the protein over a longer duration in enzyme free simulated intestinal fluid, than those cross-linked with divalent ions. Mg++, Sr++, Co++ and Zn++ failed to form isolable beads.
引用
收藏
页码:311 / 318
页数:8
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