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All Journal The Journal of Pure and Applied Chemistry Research IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Jurnal Penelitian Sains Indonesian Journal of Chemistry JPPM (Jurnal Pengabdian dan Pemberdayaan Masyarakat) Jurnal Pengabdian Masyarakat Bidang Sains dan Teknologi Makara Journal of Science SWARNA Aceh International Journal of Science and Technology

Desnelli Desnelli

Department Of Chemistry, Faculty Of Mathematics And Natural Science, Universitas Sriwijaya, Indralaya 30662 Indonesia Biofuel Research Group, Department Of Chemistry, Faculty Of Mathematics And Natural Science, Universitas Sriwijaya, Indralaya 30662

Author-ID : 624687

Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Transportation Veterinary

Published : 15 Documents Claim Missing Document

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Kinetika Reaksi Oksidasi Asam Miristat, Stearat, dan Oleat dalam Medium Minyak Kelapa, Minyak Kelapa Sawit, serta Tanpa Medium Desnelli Desnelli; Zainal Fanani
Jurnal Penelitian Sains Vol 12, No 1 (2009)
Publisher : Faculty of Mathtmatics and Natural Sciences

Kinetika reaksi oksidasi asam miristat, asam oleat dan asam stearat dalam medium minyak kelapa dan kelapa sawit telah dipelajari dengan mengukur pengurangan luas kromatogram asam lemak dengan kromatografi gas. Hasil penelitian menunjukan bahwa reaksi oksidasi asam miristat, asam oleat dan asam stearat mengikuti reaksi orde-1. Hasil penentuan energi aktivasi menunjukkan bahwa energi aktivasi asam oleat lebih kecil dibanding asam miristat dan asam stearat dalam minyak kelapa , minyak kelapa sawit maupun tanpa medium. Dari hasil tersebut menunjukkan bahwa asam oleat lebih cepat teroksidasi dibanding asam stearat dan asam miristat.

Pengaruh Lumpur Bekas Pemboran Sumur Minyak Terhadap Pencemaran Lingkungan Desnelli Desnelli
Jurnal Penelitian Sains No 3 (1998)
Publisher : Faculty of Mathtmatics and Natural Sciences

Lumpur bor yang dipakai dalam pemboran sumur minyak dan gas bumi berfungsi mengangkat lapisan di bawah tanah (cutting). Adanya kandungan logam berat dalam lumpur bor dapat berbahaya terhadap lingkungan. Pada penelitian ini dicoba untuk mengetahui sejauh mana kadar logam berat yang terdapat dalam lumpur baru maupun lumpur bekas menunjukkan adanya kandungan logam berat. Sedangkan terhadap lumpur bekas yang diperlakukan dengan air pada kondisi pH 4,6,7 dan 8 memperlihatkan adanya logam berat yang larut (leachate), dimana konsentrasi logam yang larut meningkat dengan menurunkan pH dari air leaching. Konsentrasi logam berat dalam lumpur bekas pada kondisi pH tersebut melebihi batas maksimum standar mutu air buangan.

Studi Biodegradasi Blend PVC-Minyak Nabati Epoksi Sebagai Salah Satu Upaya Mengurangi Pencemaran Lingkungan Oleh Limbah Plastik Desnelli Desnelli; Miksusanti Miksusanti
Jurnal Penelitian Sains Vol 13, No 2 (2010)
Publisher : Faculty of Mathtmatics and Natural Sciences

Polivinil klorida(PVC) merupakan salah satu bahan plastic yang yang banyak digunakan sebagai pengemas makanan, tetapi sulit terdegradasi. Pada penelitian ini dilakukan pencampuran polivinil klorida dengan minyak biji karet epoksi untuk mendapatkan plastic yang dapat terbiodegradasi. Komposisi poliblend yang dibuat adalah 35% berat minyak biji karet epoksi.Proses biodegradasi dilakukan dengan menggunakan bakteri Staphylococus aureus selama 30 hari. Pengamatan terhadap poliblend setelah proses biodegradasi yaitu terlihat adanya bintik-bintik coklat. Hasil analisa dengan SEM menunjukkan adanya kerusakan pada permukaan poliblend setelah proses biodegradasi. Hasil penentuan temperature leleh dan berat molekul rerata viskosistas polivinil klorida menurun setelah biodegradasi.

Adsorpsi Zat Warna Auramine dalam Limbah Pencelupan Jumputan dengan Batang Pisang Gedah Desnelli Desnelli; Miksusanti Miksusanti
Jurnal Penelitian Sains No 16 (2004)
Publisher : Faculty of Mathtmatics and Natural Sciences

Telah dilakukan penelitian menggunakan serbuk pelepah batang pisang sebagai penyerap zat warna auramine. Pada penelitian ini dilakukan variasi waktu kontak, berat serbuk batang pisang, konsentrasi dan pH larutan auramine, serta kondisi optimum yang diperoleh akan diaplikasikan dalam menyerap zat warna auramine dalam limbah pencelupan kain tenun. Pengukuran konsentrasi auramine pada semua perlakuan ditentukan dengan spektronik 20 D. Hasil penelitian menunjukkan kondisi optimum penyerapan auramine oleh serbuk batang pisang yang diberi penambahan NaOH terjadi pada waktu kontak 60 menit, berat serbuk 0,05 gram, konsentrasi 25 ppm dan pH 7 dengan efisiensi penyerapan maksimum 89,6969% sedangkan untuk serbuk batang pisang yang tidak diberi perlakuan waktu kontak 80 menit, berat serbuk 0,05 gram, konsentrasi 25 ppm dan pH 7 dengan efisiensi penyerapan sebesar 94,2423%. Kondisi penyerapan auramine dalam limbah pencelupan kain oleh serbuk pelepah batang pisang tanpa perlakuan besarnya 51,7271% dan untuk serbuk batang pisang dengan perlakuan sebesar 41,8415%.

Synthesis and Characterization of Fe3O4 Nanoparticles Modified with Polyethylene Glycol as Antibacterial Material Poedji Loekitowati Hariani; Desnelli Desnelli; Fatma Fatma; Rizki Indah Putri; Salni Salni
The Journal of Pure and Applied Chemistry Research Vol 7, No 2 (2018): Edition May-August 2018
Publisher : Chemistry Department, The University of Brawijaya

The iron oxide (Fe3O4) nanoparticles modified with polyethylene glycol (PEG) was synthesized by co-precipitation methods using ferric and ferrous ions as the precursors. Further, the antibacterial activity was performed against gram-positive and gram-negative bacteria. The Fe3O4-PEG was characterized using X-Ray Diffraction (XRD), Fourier Transform Infra Red (FTIR), Scanning Electron Microscopy (SEM) with energy dispersive X-Ray analysis (EDAX) and Vibrating Sample Magnetometer (VSM). The particle size of Fe3O4-PEG calculated using XRD is 46.2 nm. The study confirmed that Fe3O4-PEG is superparamagnetic and has a saturation magnetization of 56.43 emu/g. The prepared Fe3O4-PEG gives the effect of both gram-positive and gram-negative pathogenic bacterial strains hence this material has potential utilization in the field of pharmaceutical and biomedical in the future.

Produksi Tablet Kosmetika Herbal Buah Tembesu Untuk Perawatan Kulit dan Wajah Addy Rachmat; Julinar Julinar; Desnelli Desnelli; Dasril Basir
JPPM (Jurnal Pengabdian dan Pemberdayaan Masyarakat) VOL. 4 NOMOR 2 SEPTEMBER 2020 JPPM (Jurnal Pengabdian dan Pemberdayaan Masyarakat)
Publisher : Lembaga Publikasi Ilmiah dan Penerbitan (LPIP)

Buah Tembesu (Fragraea fragrans) memiliki metabolit sekunder asam ursolat, asam oleanolat, dan alkaloid gentianin. Senyawa metabolit sekunder ini telah diteliti dan dapat dimanfaatkan sebagai antiinflamasi, antikanker, antibakterial, antiaging, antifungal, antiviral, antialergik. Senyawa flavonoid juga teridentifikasi pada buah ini yang dapat digunakan sebagai antioksidan dan peredam radikal bebas penahan ageing; dan tanin trimer sebagai antikerut (antiwrinkle). Produk kosmetika herbal dari buah Tembesu telah diuji dan memberikan manfaat bagi peningkatan kesehatan kulit dan wajah. Warga di Desa Limbang Jaya II memiliki pemukiman yang kaya akan pohon Tembesu. Kegiatan pengabdian berupa penyuluhan dan pelatihan pembuatan kosmetika alam akan memberikan nilai lebih bagi hasil alam di desa tersebut. Produk kosmetika ini lebih disukai oleh remaja milenial saat ini karena tidak saja halal tetapi juga berkhasiat untuk perawatan tanpa ada efek samping karena hanya mengandung bahan alami.

BIODEGRADATION OF POLYBLEND POLYPROPILENE- PALM OIL-AMYLUM BY Bacillus subtilus AND Clostridium botulinum Zainal Fanani; Miksusanti Miksusanti; Desnelli Desnelli
Indonesian Journal of Chemistry Vol 3, No 3 (2003)
Publisher : Universitas Gadjah Mada

It had been done a biodegradation polyblend from blending polypropilene-palm oil-amylum with three composition of polyblend i.e polyblend A 80% polypropilene- 19.5% palm oil- 0.5% amylum, poliblend B 80% polypropilene- 19% palm oil- 1% amylum and polyblend C 80% polypropilene-18% palm oil- 2% amylum by B. subtilus and C. botulinum, time incubation was twenty five days. The characterization of polyblend before and after biodegradation has done with FTIR, DTA, Viscometre and tensile strength of polyblend. The result showed that Bacillus subtilus and Clostridium botulinum can biodegradate polyblend and make holes as well as chink on polyblend especially polyblend C, because it has more carbohidrat than polyblend A and B. Analysis from FTIR showed compatible of poliblend because it did not have a new function group and did not change of wavelength. Data of tensile strength showed lower value after biodegradation at polyblend C and from DTA and Viscometre showed lower melting point and lower average molecule weight, respectively.

Cr (III)-Doped Bentonite: Synthesis, Characterization and Application for Phenol Removal Purwaningrum, Widia; Vilantina, Vilantina; Rizki, Widya Twiny; Desnelli, Desnelli; Hariani, Poedji Loekitowati; Said, Muhammad
Makara Journal of Science Vol. 25, No. 2
Publisher : UI Scholars Hub

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Study of doping process of metal oxide Cr(III) onto bentonite for phenol removal has been done. The purpose of this study was to increase the capacity and effectiveness of bentonite adsorption.The doped bentonite was characterized using XRD, SEM-EDX and FT-IR spectrophotometer analysis. XRD characterization result showed an angle shift (2θ) characteristic at1.609°. The SEM-EDX characterization result showed that bentonite as control have a more gaps than Cr(III)-doped bentonite. Based on EDX result, the Al element decreased from 7.53% to 3.76%, Si from 19.84% to 10.23% and appeared Cr element 2.06%, The FT-IR characterization result showed no significant friction in the spectrum so it can be identified as physical adsorption. The adsorption of phenol was applied at pHpzc, which for bentonite as control was applied at pH 4 and Cr(III)- doped bentonite was applied at pH 8. The phenol adsorption rate fitted to pseudo-second-order and it was found that the equilibrium data was best followed by Freundlich isotherm model, the amount of adsorption rate constant (k) and adsorption capacity (Qe) was 0.0024 g.mg-1min-1 and 16.95 mg/g. The Enthalpy (ΔH) and entropy (ΔS) values decrease with increasing phenol concentration and the positive free energy value was indicated that the proccess was nonspontaneous because there has been an equilibrium state. Based on the adsorption result, it can be concluded that the doping method can produce better bentonite performance to adsorb phenol.

Pyrolysis of Puspa Wood Sawdust and Sugarcane Bagasse into Biochar Wan Ryan Asri; Hasanudin Hasanudin; Ady Mara; Desnelli Desnelli
Aceh International Journal of Science and Technology Vol 11, No 1 (2022): April 2022
Publisher : Graduate Program of Syiah Kuala University

Puspa wood sawdust and sugarcane bagasse are abundantly available but have low carbon content and nutrients. The carbon content and nutrients could be increased by converting biomass into biochar through pyrolysis. The independent variables of pyrolysis were essential to investigate because those inherently influence biochar quality. In this study, the effect of pyrolysis temperature (300, 350, 400, 450, and 500 ˚C) and time (30, 60, 90 mins) on the biochar characteristic such as pH, yield, and proximate compositions were determined. The total nitrogen, P2O5, and K2O content at optimum condition biochar were also investigated. The data analysis showed that the pyrolysis temperature and time increment positively correlated to the pH, ash content, and carbon content. At the same time, the yield and volatile matter were vice versa. Both biochar's optimum pyrolysis temperature and time were achieved at 500 and 90 minutes. The carbon content and nutrient of biochar were also increased compared to the biomass. The pyrolysis method has enhanced biomass quality, and the biochar may be used as a growing media and soil amendment. It can be concluded that the sugarcane bagasse biochar was more likely favorable than puspa wood sawdust biochar due to its higher fixed carbon and nutrient content

Effect of Silica Addition on Mechanical Properties of Eggshell-Derived Hydroxyapatite . Fatma; . Desnelli; Fahma Riyanti; Mustafa Kamal; Muhammad Ramdan Abdul Mannan; Poedji Loekitowati Hariani
Aceh International Journal of Science and Technology Vol 10, No 2 (2021): August 2021
Publisher : Graduate Program of Syiah Kuala University

Eggshell is a solid waste that is available in abundance but is being left unused. Eggshell containing calcium in a high amount. Calcium can be used as a precursor for hydroxyapatite (HAp). Modification of HAp with SiO2 is expected to improve its low mechanical properties for biomedical applications. In this study, HAp is synthesized from the eggshell. Then, it was modified by adding SiO2 utilizing the coprecipitation method with concentrations of 10%, 20%, 30%, and 40%, respectively. The HAp and HAp/SiO2 were characterized using; X-ray diffraction and Fourier transform infrared spectroscopy. The analysis HAp and HAp/SiO2 were density, compressive strength, and hardness. The best mechanical properties of HAp/SiO2 were characterized using SEM-EDS. The HAp were prepared successfully with a ratio of Ca/P was 1.673, close to the theoretical 1.67. The addition of SiO2 caused a decrease in crystallite size and density but increased compressive strength and hardness. The best mechanical properties of HAp/SiO2 were obtained with SiO2 of 30% and 40% with similar values.

Co-Authors Addy Rachmat Ady Mara Ady Mara Ady Mara, Ady Azhar Kholiq Dasril Basir Dasril Basir David Fernando Dedi Rohendi Eliza Eliza Eliza Eliza Fahma Riyanti Fatma Fatma Fatma Hasanudin, Hasanudin Ipro Hati Padilah Julinar Julinar Leidya Yulinda Maria Ulfa Miksusanti Miksusanti Miksusanti Miksusanti Muhammad Ramdan Abdul Mannan MUHAMMAD SAID Mustafa Kamal Poedji Loekitowati Hariani Rizki Indah Putri Rizki, Widya Twiny Salni Salni Tri Kurnia Dewi Vilantina, Vilantina Wan Ryan Asri Wan Ryan Asri Widia Purwaningrum Zainal Fanani Zainal Fanani

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