Kharisma, DesitaZuni (2016) Pengaruh Waktu Hidrolisis Selulosa Nata de coco Secara Enzimatis Terhadap Produk Selulosa Terhidrolisis Sebagai Bahan Baku Membran Termodifikasi Asam Palmitat. Sarjana thesis, Universitas Brawijaya.
Abstract
Selulosa nata de coco, suatu sumber selulosa terbarukan, telah banyak dikembangkan menjadi material fungsional, salah satunya sebagai selulosa ester. Panjang rantai polimer telah diketahui mempengaruhi sifat material. Tujuan penelitian ini yaitu untuk mengetahui pengaruh waktu hidrolisis selulosa nata de coco terhadap produk hidrolisis dan menentukan karakter selulosa ester, serta potensinya sebagai bahan baku membran. Selulosa nata de coco dihidrolisis oleh enzim hidrolase dengan variasi waktu 1, 2, 3 dan 4 jam. Selanjutnya, produk selulosa terhidrolisis selama 2 jam diesterifikasi menggunakan asam palmitat pada temperatur 75 ⁰C. Selulosa ester dikarakterisasi berdasarkan gugus fungsi pada spektrum FTIR. Film tipis selulosa palmitat, kemudian diuji lebih lanjut untuk mengetahui hidrofobisitas dan ukuran pori, berturutturut melalui penentuan indeks swelling dan menggunakan metoda bubble point. Hasil penelitian menunjukkan pemutusan rantai telah berlangsung, ditandai dari meningkatnya yield selulosa hingga waktu hidrolisis 3 jam namun menurun setelahnya. Sedangkan kadar glukosa dalam hidrolisat meningkat. Adanya gugus fungsi karbonil pada spektrum FTIR menunjukkan selulosa palmitat telah terbentuk. Terbentuknya film selulosa palmitat yang bersifat lebih hidrofob dibandingkan selulosa terhidrolisis dengan ukuran pori terbesar 1,13 μm, memberikan kemungkinan pemanfaatannya sebagai bahan baku membran.
English Abstract
Nata de coco cellulose, a renewable cellulose resources which was modified into cellulose ester as functional materials, has been widely developed. The influences of polymers chain length toward material properties have been known. This aims research were to determine the effect of hydrolysis time on hydrolyzed cellulose produced and its properties as cellulose ester. Moreover, its potential as membrane raw materials has been investigated. Nata de coco cellulose hydrolysis enzymatically at time of 1, 2, 3 and 4 hours have been done. Hydrolyzed cellulose product for 2 hours was then esterified at temperature of 75 ⁰C using palmitic acid. Afterwards, cellulose ester was characterized based on functional groups of FTIR spectra, meanwhile, cellulose palmitate thin film properties i.e. hydrophobicity and pore size was further tested. It has been done through swelling index and bubble point method, respectively. The result showed that the cellulose chains break has been obtained, indicating by the increasing cellulose yield up to 3 hours of hydrolysis time. However, it was decreasing afterwards. Whereas, glucose content of hydrolysate was increasing. The presence of carbonyl functional groups indicated that cellulose palmitate has been produced, which was more hydrophobic comparing to hydrolyzed cellulose. In addition, the cellulose palmitate thin film with the largest pore size of 1.13μm providing its potency as membrane raw materials.
| Item Type: | Thesis (Sarjana) |
|---|---|
| Identification Number: | SKR/MIPA/2016/400/051610337 |
| Subjects: | 500 Natural sciences and mathematics > 540 Chemistry and allied sciences |
| Divisions: | Fakultas Matematika dan Ilmu Pengetahuan Alam > Kimia |
| Depositing User: | Kustati |
| Date Deposited: | 02 Nov 2016 09:23 |
| Last Modified: | 02 Nov 2016 09:23 |
| URI: | http://repository.ub.ac.id/id/eprint/154932 |
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