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All Journal Teknotan: Jurnal Industri Teknologi Pertanian Chimica et Natura Acta Molekul: Jurnal Ilmiah Kimia
Yusi Deawati
1Kelompok Riset Kimia Anorganik Dan Fisik, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Institut Teknologi Bandung, Indonesia 2Laboratorium Kimia Fisik Dan Anorganik, Departemen Kimia, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Padj
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Environmental Science Materials Science & Nanotechnology Other

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Pengaruh Suhu Karbonisasi terhadap Kualitas Briket dari Tongkol Jagung dengan Limbah Plastik Polietilen Terephtalat sebagai Bahan Pengikat Haryono Haryono; Iman Rahayu; Yusi Deawati
Teknotan: Jurnal Industri Teknologi Pertanian Vol 14, No 2 (2020): TEKNOTAN, Desember 2020
Publisher : Fakultas Teknologi Industri Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/jt.vol14n2.3

Abstract

Jagung sebagai salah satu komoditas tanaman pangan memiliki peranan strategis. Biji jagung dapat dimanfaatkan untuk berbagai keperluan, seperti: bahan pangan alternatif pengganti beras, bahan baku utama pada pembuatan pakan ternak, dan bahan baku di industri pangan. Pada pemanfaatan jagung tersebut, mulai dari tahap pemanenan sampai perontokan biji jagung, dihasilkan sejumlah limbah. Sekitar 17,24% dari limbah tersebut adalah limbah berupa tongkol jagung. Relatif tingginya kadar selulosa, hemiselulosa, dan lignin membuat tongkol jagung merupakan limbah biomassa potensial sebagai bahan baku bahan bakar bio, salah satunya adalah briket. Salah satu tahap proses pembuatan briket yang sangat menentukan kualitas briket adalah tahap karbonisasi biomassa. Tujuan penelitian ini adalah mempelajari pengaruh suhu karbonisasi tongkol jagung, terhadap penampilan fisik dan kualitas briket, dengan memanfaatkan limbah plastik PET sebagai bahan pengikat pembantu. Suhu karbonisasi dipelajari pada suhu 350, 400, dan 450 oC. Sedangkan kualitas briket ditentukan berdasarkan parameter kualitas menurut SNI 01-6235-2000 tentang Briket Arang Kayu meliputi nilai kalor, kadar air, kadar abu, dan kadar volatile matter, serta komposisi gas buang pembakaran briket tersebut. Hasil penelitian menunjukkan bahwa briket yang dihasilkan dari tahap karbonisasi pada suhu 450 oC merupakan briket dengan kualitas paling optimum. Briket tongkol jagung pada suhu karbonisasi tersebut telah memenuhi standard kualitas menurut SNI 01-6235-2000 dengan nilai kalor sebesar 6072,01 kal/g (25,38 MJ/kg). Kadar air, abu, dan volatile matter dari briket tersebut berturut-turut sebesar 4,98, 6,00, dan 7,00%. Sedangkan berdasarkan uji komposisi gas buang, pembakaran briket tersebut menghasilkan gas hidrokarbon dengan kadar paling sedikit.
Activity of Superoxide Dismutase Mimic of [Mn(salen)OAc] Complex Compound Non-enzymatically in Vitro Through Riboflavin Photoreduction Yusi Deawati; Djulia Onggo; Irma Mulyani; Iwan Hastiawan; Dikdik Kurnia
Molekul Vol 12, No 1 (2017)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (563.163 KB) | DOI: 10.20884/1.jm.2017.12.1.294

Abstract

The complex compound of [Mn(salen)OAc] can serve as mSOD and its activity has been determined non-enzymatically in vitro through riboflavin photoreduction. The complex was synthesized from Mn(OAc)2.4H2O and H2salen. Based on the elemental analysis, the C=56.69%; H=4.21%; and N=7.52% content are corresponding to the chemical formula of MnC18H17N2O4. The functional groups and ionic species in the complex have been analyzed by infrared spectroscopy and ESI-MS. SOD activity was determined by mixing complex at various concentrations with riboflavin and nitroblue tetrazolium (NBT), then the mixture was lighted with 20 Watt tungsten lamp for 15 minutes in a closed box. Then the reduced NBT absorptions were measured at λ 560 nm. The difference of absorbance between standard and sample solutions (without and with riboflavin, respectively) was multiplied by 100% to obtain %inhibition of each various sample concentration against NBT. SOD activity was obtained from IC50 data defined as a 50% inhibition of the plot curve of % inhibition to the concentration of the complex. The result obtained for this compound is IC50 = 2.7 ± 0.05 µM as well as enzymatic method. Therefore, this method can be used to determine the SOD activity by giving more stability and accuracy of IC50 value.
Synthesis of Hydroxyapatite-Zirconia Composite and Activity Test as Dental Implant Material Noviyanti, Atiek Rostika; Yashfi, Difa Muhammad; Deawati, Yusi; Maryani, Eneng; Hemzah, Sabila Aulia; Ma’amor, Azman
Chimica et Natura Acta Vol 13, No 1 (2025)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/cna.v13.n1.60026

Abstract

Hydroxyapatite (HAp) is one of the bioceramics that is widely used in various fields, one of which is the health sector as a dental implant material. One of the reasons is that hydroxyapatite has good biocompatibility. In this study, natural calcium sources such as eggshell waste were utilized for the synthesis of hydroxyapatite. However, its mechanical properties do not yet meet the requirements as a dental implant material, its modification is usually done by adding other compounds, such as zirconium oxide. Zirconium oxide can be used as a support material because it has good strength, toughness, and durability as a dental implant. Therefore, in this study, a hydroxyapatite-zirconium oxide (HAp-ZrO2) composite was synthesized for dental implant material. This study aims to determine the effect of adding ZrO2 on increasing the mechanical and corrosion resistance of HAp. The research methods include isolation of CaO from chicken eggshells, synthesis of hydroxyapatite, synthesis of HAp-ZrO2 composite, hardness test, and corrosion resistance test. Based on SEM images, the addition of ZrO2 can reduce the level of HAp agglomeration. The addition of ZrO2 to HAp did not significantly affect the increase in HAp hardness since the zirconia phase formed is possibly dominated by the cubic phase. The optimum HAp-ZrO2 composite was obtained with a variation of HAp-90%-ZrO2-10% which showed the highest crystallinity of 75.37% with a crystal size at 10.15 nm with corrosion resistance comparable to pure HAp.
Co-Authors Atiek Rostika Noviyanti Dikdik Kurnia Djulia Onggo Haryono Haryono Hemzah, Sabila Aulia Irma Mulyani Iwan Hastiawan Maryani, Eneng Ma’amor, Azman TATI NURHAYATI Yashfi, Difa Muhammad