Lukman Atmaja
Department of Chemistry, Sepuluh Nopember Institute of Technology (ITS), Jl. Arief Rahman Hakim, Sukolilo, Surabaya 60111

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Pembuatan dan Karakterisasi Film Pati Kulit Ari Singkong/Kitosan dengan Plasticizer Asam Oleat Wahyuningtyas, Meliana; Atmaja, Lukman
Indonesian Journal of Chemical Science Vol 5 No 1 (2016)
Publisher : Indonesian Journal of Chemical Science

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Abstract

Penelitian tentang pembuatan dan karakterisasi film pati kulit ari singkong/kitosan dengan plasticizer asam oleat telah dilakukan. Pada penelitian ini, pati kulit ari singkong bertindak sebagai matriks, kitosan sebagai biopolimer pencampur dan asam oleat sebagai lipida. Formulasi larutan yang digunakan diberi nama sebagai berikut: CS75 OA 0%, CS60/CH15/OA 0%, CS45/CH30/OA 0%, CS37,5/CH37,5/OA 0%, CH75/OA 0%, CS75/OA 1%, CS60/CH15/OA 1%, CS45/CH30/OA 1%, CS37,5/CH37,5/OA 1%, dan CH75/OA 1%. CS merupakan pati kulit ari singkong, CH merupakan kitosan dan OA merupakan asam oleat. Asam oleat ditambahkan hingga mencapai konsentrasi akhir larutan sebesar 0% dan 1% (v/b). Film yang dibuat dikarakterisasi dengan Fourier Transform Infra Red (FTIR), Tensile Strenght dan analisa water uptake. Adapun hasil yang diperoleh dari penelitian ini adalah bahwa film kulit ari singkong/kitosan dengan plasticizer asam oleat memiliki penampakan visual transparan dan homogen. Hal ini mengindikasikan bahwa pati kulit ari singkong, kitosan dan asam oleat mampu berinteraksi dengan baik. Penambahan asam oleat hingga mencapai konsentrasi akhir larutan 1% (v/b) mempengaruhi sifat fisik film pada variasi tertentu, yaitu meningkatkan % elongasi, namun menurunkan nilai stress, nilai Modulus Young dan nilai water uptake secara signifikan.
Analisis Kuat Tarik dan Elongasi Film Gelatin – Khitosan Wafi, Abdul; Atmaja, Lukman; Ni’mah, Yatim Lailun
ALCHEMY Vol 8, No 1 (2020): ALCHEMY: Journal of Chemistry
Publisher : Department of Chemistry, Faculty of Science and Technology UIN Maulana Malik Ibrahim Malan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (590.944 KB) | DOI: 10.18860/al.v8i1.9097

Abstract

Gelatin and chitosan have been widely used in various industries such as pharmaceuticals, textiles, cosmetics, food processings, and others. Gelatin has different mechanical properties compared to chitosan, especially its tensile strength and elongation. In this study, gelatin (Ge) was obtained commercially, while chitosan (Ch) was obtained from the skin of windu shrimp via deproteination, demineralization, and deacetylation of chitin into chitosan. The results of this study indicated that the degree of deacetylation of chitosan was 52.06%. Afterward, various films including Ge, Ch, Ge 4%-Ch 1.5%, Ge 4%-Ch 3%, Ge 4%-Ch 4% were prepared by the casting method. The film of Ge 4%-Ch 4% exhibited the best tensile strength and elongation with values of 0.6 MPa and 21.53%, respectively. Gelatin dan kitosan merupakan biopolimer alam yang selama ini banyak digunakan di berbagai industri seperti farmasi, tekstil, kosmetik, pengolahan pangan dan lain sebagainya. Gelatin memiliki sifat mekanik yang berbeda dibandingkan dengan kitosan terutama kuat tarik dan elongasinya. Pada penelitian ini, gelatin (Ge) diperoleh secara komersial, sedangkan kitosan (Ch) diperoleh dari kulit udang windu melalui proses deproteinasi, demineralisasi, dan deasetilasi kitin menjadi kitosan. Hasil penelitian ini menunjukkan derajat deasetilasi kitosan sebesar 52,06%.  Selanjutnya, dilakukan proses pembuatan film Ge, Ch, Ge 4%-Ch 1,5%; Ge 4%-Ch 3%, Ge 4%-Ch 4% dengan menggunakan metode casting. Film Ge 4%-Ch 4% memiliki kuat tarik dan elongasi yang paling baik yaitu 0,6 MPa dan 21,53%, berturut-turut. 
Fabrication and Characterization of Chitosan/N-Phthaloyl Composite Membrane for DMFC Application Nugraeni, Christine Dyta; Atmaja, Lukman; Hayati, Nur; Purwanto, Mochammad; Santoso, Mardi; Kusumawati, Yuli
Jurnal Riset Kimia Vol 12, No 2 (2021): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v12i2.408

Abstract

Modified chitosan membrane is one of the promising membranes for polymer electrolyte membrane. Chitosan/N-phthaloyl chitosan composite membranes were fabricated to obtain high proton conductivity and low methanol permeability. Membranes were fabricated by casting method and solvent evaporation. Surface morphology, mechanical analysis, methanol permeability, and proton conductivity were used to characterize the overall properties. FT-IR spectra exhibited the presence of interaction of chitosan and n-phthaloyl/chitosan. SEM analysis showed that the surface roughness of composite membrane increases as the n-phthaloyl loading increases. The highest proton conductivity of synthesized membrane is at 2.4 mS.cm-1 and is higher than pristine chitosan membrane at 1.6 mS.cm-1. Moreover, with n-phthaloyl/chitosan addition, the methanol permeability was also improved. The correlation between proton conductivity and methanol permeability in composite membranes suggests that the blend has its potential in DMFC application.