Hasil Pencarian  ::  Simpan CSV :: Kembali

Abstrak :
Pada penelitian ini enkapsulasi obat ibuprofen menggunakan hidrogel interpenetrating polymer network (semi- dan full-IPN) berbasis kitosan dan poli(N-vinil-2-pirolidon) (PNVP) telah dipelajari. Enkapsulasi dilakukan dengan metode post loading dan in situ loading. Hidrogel IPN dipersiapkan dengan mengikat silang kitosan dan PNVP, masing-masing menggunakan asetaldehida dan N,N-metilena-bis-akrilamida (MBA). Komposisi hidrogel IPN yang digunakan terdiri dari kitosan:PNVP 70:30, 2% asetaldehida 0,1 M, 1% katalis amonium persulfat (APS), dan 1% MBA. Karakterisasi pembentukan jaringan IPN dan mikrokapsul dievaluasi menggunakan FTIR, SEM dan DSC. Hidrogel semi-IPN mampu menjerap obat lebih baik dibandingkan hidrogel full-IPN. Metode in situ loading memberikan efisiensi loading yang lebih besar dibandingkan metode post loading. Pelepasan ibuprofen selama 2 jam dalam pH 7,4 secara in situ loading adalah 52.13% (full-IPN) dan 30,41% (semi-IPN); untuk metode post loading pelepasannya adalah 79.77% (full-IPN) dan 97.10% (semi-IPN). Degradasi hidrogel full-IPN lebih sulit terjadi dibandingkan dengan hidrogel semi-IPN dalam 2 pH yang berbeda, yaitu pH 1,2 dan pH 7,4.

---

In this research, the encapsulation of ibuprofen using interpenetrating polymer network (semi- and full-IPN) hydrogel, based on chitosan and poly(N-vinyl-2-pyrrolidone) (PNVP) have been studied. The encapsulation was carried out by post loading and in situ loading method. IPN hydrogel was prepared by crosslinking chitosan and PNVP using acetaldehyde and N,N-metylene-bis-acrylamide (MBA), respectively. The hydrogel contain chitosan:PNVP 70:30 (w/w), 2% acetaldehyde 0.1 M, 1% ammonium persulphate (APS) catalyst and 1% MBA. Characterization of the formation of IPN network and microcapsules were evaluated by using FTIR, SEM and DSC. Semi-IPN hydrogel could entrapped drug molecules better than full-IPN hydrogel. In situ loading method provide loading efficiency higher than post loading method. The release of ibuprofen for 2 hours at pH 7.4 by in situ loading method were 52.13% (full-IPN) and 30.41% (semi-IPN); for post loading method 79.77% (full-IPN) dan 97.10% (semi-IPN). Degradation of full-IPN hydrogel was more difficult than semi-IPN hydrogel at 2 different pH, 1.2 and 7.4.

Abstrak :
Sintesis hidrogel kitosan-poli(N-vinil-2-pirolidon) (PNVP) dengan metode full-Interpenetrating Polymer Network (full-IPN) dilakukan secara bertahap (sequential). Tahap pertama yaitu melakukan sintesis jaringan polimer kitosan terikat silang asetaldehida melalui homogenisasi. Tahap kedua yaitu melakukan sintesis jaringan PNVP terikat silang N, N?-metilenbisakrilamida (MBA) melalui reaksi polimerisasi radikal bebas dari monomer NVP dengan agen pengikat silang MBA dan inisiator amonium persulfat (APS). Hidrogel kitosan-PNVP full-IPN yang dihasilkan, memiliki kekuatan ikat silang lebih baik yang teramati dari nilai derajat ikat silang serta dapat mempertahankan kemampuan swelling dengan baik yang teramati dari nilai rasio swelling dibandingkan dengan hidrogel kitosan. Hasil optimum dari rasio swelling dan derajat ikat silang pada hidrogel kitosan-PNVP full-IPN sebesar 149,8% dan 85,4% dengan komposisi kitosan:monomer NVP yaitu 70:30 (b/b %), waktu reaksi polimerisasi 0,5 jam, konsentrasi MBA 1% (b/b), serta konsentrasi APS 1% (b/b). Karakterisasi dilakukan dengan Spektrofotometer Fourier Transform Infrared (FTIR), Differential Scanning Calorimetry (DSC), dan Scanning Electron Microscope (SEM).

---

Synthesis of hydrogel chitosan-poly(N-vinyl-2-pyrrolidone) (PNVP) by full-Interpenetrating Polymer Network was performed in stages (sequential method). The first stage was the synthesis of chitosan polymer network by crosslinked with acetaldehyde under homogenization process. The second stage was the synthesis which was PNVP of crosslinked with N,N?-methylenebisacrylamide (MBA) through free radical polymerization reaction of NVP monomer, was used as the crosslink agent MBA and ammonium persulfate (APS) as the initiator. The synthesized hydrogel chitosan-PNVP full-IPN has a good strength due to the observed crosslinking structure observed the value of crosslinking degree and the good swelling capability by the value of swelling ratio compared with hydrogel chitosan. The optimum result of swelling ratio and the degree of crosslinking from hydrogel chitosan-PNVP full-IPN were 149,8% and 85,4% which were obtained with the composition chitosan:NVP monomer of 70:30 (w/w %), the polymerization reaction time of 0,5 hours, the concentration MBA 1% (w/w), and the concentration APS 1% (w/w). Products characterizations were done by Fourier Transform Infrared Spectrophotometer (FTIR), Differential Scanning Calorimetry (DSC), dan Scanning Electron Microscope (SEM).