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Agus Sudaryono
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Environmental Science Materials Science & Nanotechnology Mathematics Physics

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Sintesis Senyawa Analog Kurkumin Simetri (1E, 3E, 8E, 10E)-1, 11-difenil-undeka-1,3,8,10 tetraena-5,7-dion Sudaryono, Agus
GRADIEN : Jurnal Ilmiah MIPA Vol 8, No 1 (2012): (Januari 2012)
Publisher : Universitas Bengkulu

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Abstract

Sintesis senyawa analog kurkumin atau lebih dikenal dengan kurkuminoid pada dasarnya dilakukan dalam rangka untuk mendapatkan keragaman dan variasi penggunaan analog kurkumin yang lebih luas. Tujuan penelitian ini adalah mensintesis senyawa baru (1E, 3E, 8E, 10E)-1,11-difenil-undeka-1,3,8,10 tetraena-5,7-dion merupakan suatu senyawa analog kurkumin simetri. Sintesis dilakukan dengan jalan mereaksikan sinamaldehid (113,5mmol) dalam DMF dengan borat anhididrat (57 mmol), larutan 2,4-pentadion (57 mmol) dan tributil borat (113,5 mmol). Lima belas menit kemudian ditambahkan ke dalamnya tetes demi tetes larutan butilamin (0,7 mL selama 40 menit). Campuran dipanaskan selama 4 jam pada suhu 80?C, kemudian reaksi diteruskan selama satu malam pada suhu kamar. Setelah reaksi selesai campuran dihidrolisis selama 1 jam menggunakan larutan asam asetat 5% pada suhu 60?C. Fasa organik dipisahkan, dicuci dikeringkan dengan menggunakan MgSO4, kemudian dievaporasi, selanjutnya dimurnikan melalui kolom kromatografi. Rendemen yang diperoleh sebagai hasil sintesis sebesar 34%, berupa kristal berwarna kuning tua, dengan titik leleh 170-172?C. Spektra IR ? cm-1 (KBr): 3022, 2926, 1612, 1282, 1124, 994, 950, 890, 845, 747, 686 dan NMR 1H (? ppm, CDCl3, 200 MHz): 5,71 (s, 1H, O=C-CH=C-O-); 6, 15 (d, 2H, 2x –C=CH-C=O); 6,92 (d, 4H, 2x-C=CH-CH=C-C-); 7,51-7,31 (m, 12 H, 2x Ar-CH=C-).   
Pembuatan dan Karakterisasi Katalis Bifungsional dari Zeolit Alam Suharto, Totok Eka; Gustian, Irfan; Sudaryono, Agus
GRADIEN : Jurnal Ilmiah MIPA Vol 3, No 2 (2007): (Juli 2007)
Publisher : Universitas Bengkulu

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Bifunctional zeolite catalysts have been prepared by three following steps: activation of local natural zeoliteby hydrochloric acid and ammonium nitrate solutions, followed by impregnation of Cr, Ni, and Ti ions separately, and finally by calcination at 500oC for 4 hours. Characterization of catalyst properties was conducted by XRD to analyze its crystal phases, by SEM to study its surface morphology, by methylene blue to determine its surface area, and by IR spectroscopic and adsorbed ammonia gravimetric methods to analyze acidic properties. X-ray difractograms show that all calcined catalysts have amorphous and dominant crystalline phases. The morphology of catalysts analyzed by SEM prohibited similar cracked lamellar layers on the surface characterized by a microporous material. These catalysts have high specific surface area of 110 m2/g. Acid amount measured by adsorbed ammonia gravimetric method is in a range of 3.00 – 3.70 mg NH3/g.   
Facile Detection of Oil Adulteration using UV-Visible Spectroscopy Coupled with Chemometrics Analysis Nina Gusti; Dinda Oktarina; Rina Elvia; Euis Nursa’adah; Rendy W Wardhana; Agus Sudaryono; M. Lutfi Firdaus
Science and Technology Indonesia Vol. 6 No. 1 (2021): January
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1587.291 KB) | DOI: 10.26554/sti.2021.6.1.14-18

Abstract

Engine and machine oils, better known as lubricant, is a fast-moving part within the motorcycle and automobile industries. Due to its high demand, these oils are often counterfeited by irresponsible people to get more profit. The thing most often done to adulterate oil is by mixing it with other low-quality or used oil. Here, we propose a simple analytical method to identify oil adulteration by using UV-Visible spectroscopy. A number of 425 genuine and adulterated oils were used as samples. After appropriate dilution using n-hexane, the samples were analyzed by UV-Visible spectrophotometer followed by Principle Component Analysis (PCA) and Principle Component Regression (PCR) as part of the chemometrics analysis. The results show that prediction samples were accurately classified into their corresponding groups with PCA scores of 49% and 27% for principal component 1 and 2, respectively. PLS model achieved a good prediction to detect lubricant oil adulteration, with R-Square of predicted and reference samples were 0.9257 and 0.9204, respectively. The proposed method shows a promising alternative to the conventional chemical method using a more sophisticated instruments such as GC-MS and HPLC for oil or other organic compound identification.
Co-Authors Dinda Oktarina Euis Nursa’adah Irfan Gustian M. Lutfi Firdaus Nina Gusti Rendy W Wardhana Rina Elvia Totok Eka Suharto