SINTESIS DAN KARAKTERISASI KARBOKSIMETIL SELULOSA DARI NATA DE COCO DENGAN RUTE ASETILASI-ETERIFIKASI

ZENDRATO, HERMAN MARIUS (2018) SINTESIS DAN KARAKTERISASI KARBOKSIMETIL SELULOSA DARI NATA DE COCO DENGAN RUTE ASETILASI-ETERIFIKASI. Undergraduate thesis, UNIMED.

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Abstract

Rute asetilasi-eterifikasi merupakan rute sintesis karboksimetil selulosa (CMC) terbaru yang diusulkan oleh peneliti sebelumnya untuk memperbaiki derajat substitusi (DS) dengan menggunakan pelarut yang tidak korosif. Metode ini dilakukan dengan konversi selulosa menjadi selulosa triasetat (CTA), lalu dilanjutkan dengan konversi CTA menjadi CMC. Sumber selulosa dapat menyebabkan perbedaan DS, sehingga pada penelitian ini digunakan selulosa yang bersumber dari selulosa bakteri (BC). Selulosa bakteri diperoleh dari kulturisasi Acetobacter xylinum dalam media air kelapa, limbah kelapa dari pasar tradisional, untuk menghasilkan nata de coco yang kemudian dipurifikasi dengan sodium hidroksida (NaOH) 1% (b/v) dan asam asetat (CH3COOH) 1% (v/v). Proses asetilasi BC dilakukan dengan menggunakan anhidrida asetat dalam pelarut asam asetat dengan katalis asam sulfat untuk menghasilkan CTA. CTA yang dihasilkan dikonversi menjadi CMC dalam sistem pelarut basa yakni THFair- NaOH, dengan konsentrasi sodium kloroasetat (SMCA) 1,1 M dan variasi pelarut NaOH yakni 1M, 0,9M, dan 0,8M selama 1 jam waktu reaksi dengan suhu 50 oC. Karakterisasi berupa analisis FTIR, TGA, dan SEM pada masing-masing produk yang dihasilkan, yakni BC, CTA, dan CMC dengan nilai DS optimal. Penentuan DS dilakukan pada CMC yang dihasilkan. Hasil menunjukkan bahwa dengan sumber BC, semakin rendah konsentrasi basa dalam sistem pelarut basa maka DS semakin besar, dengan hasil optimum pada konsentrasi basa 0,8M dengan DS 0,3976. Akan tetapi sintesis CMC dari BC dengan rute asetilasieterifikasi dalam pelarut sistem basa yakni THF-air-NaOH yakni konversi CTA menjadi CMC tidak berhasil, disebabkan karena CTA tidak dapat larut dalam THF sekalipun diperlakukan dengan NaOH.

Item Type: Thesis (Undergraduate)
Contributors:
ContributionNameNIDN/NIDK
Thesis advisor, Nurfajriani196709022005022004
Call Number: SK-2018 KIM 172
Keywords: karboksimetil selulosa, selulosa bakteri, A. xylinum, selulosa triasetat, derajat substitusi, FTIR, TGA, SEM
Subjects: L Education > LB Theory and practice of education
Q Science > QD Chemistry
Divisions: Fakultas Matematika dan Ilmu Pengetahuan Alam > Kimia
Depositing User: Mr Renaldi Syafaruddin Akbar
Date Deposited: 21 Feb 2019 14:09
URI: http://digilib.unimed.ac.id/id/eprint/32167

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