Iip Izul Falah
Departement of Chemistry Faculty of Sciences and Mathematics Universitas Gadjah Mada Yogyakarta

Published : 16 Documents
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DETERMINATION OF CONSECUTIVE REACTION RATE CONSTANTS BETWEEN GLYCINE AND ISOLEUCINE WITH O-PHTHALDIALDEHYDE AND 2-MERCAPTOETHANOL FROM SINGLE EXPERIMENT DATA Falah, Iip Izul; Triyono, Triyono; Atmaji, Catur
Indonesian Journal of Chemistry Vol 11, No 1 (2011)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.21414

Abstract

Kinetics study of chemical reaction is important in producing optimum product, designing a reactor, analyzing a compound, and many other purposes. This work presents the result of study of consecutive pseudo first order reaction between glycine and isoleucine with o-phthaldialdehyde and 2-mercaptoethanol in borate buffer solution at pH=9.0. Continuous detection was used to follow the change of fluorescence intensity of formed isoindole during the reaction. Although concentrations of initial compound and its derivative were not known; by using iteration method, the reaction constants could be determined with high precision from single experiment data. Result of the work showed that reaction rate constants k1 and k2 for consecutive reaction of glycine with excess of o-phthaldialdehyde and 2-mercaptoethanol were 18.75x10-3 and 26.70x10-5 s-1, respectively; whereas for isoleucine were 6.06x10-3 and 12.59x10-5 s-1, respectively.
THE INTERCALATION OF COPPER INTO ACTIVE CARBON AND ITS APPLICATION AS A CATALYST FOR N-AMYLALCOHOL DEHYDRATION Rusman, Rusman; Falah, Iip Izul; Alim, RHA. Sahirul
Indonesian Journal of Chemistry Vol 1, No 1 (2001)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.21957

Abstract

The intercalation of CuCl2 salts into active carbon and its activity as catalyst on dehydration of n-amylalcohol has been investigated. In this research, the intercalation was conducted by reacting CuCl2 powder with active carbon and Cl2 gas at 3 atm, temperature 575 °C, at various heating time. This process was then followed by the reduction in the flowing hydrogen gas. Characterization of intercalation product was conducted by gas sorption method to determine surface area, pore radius, and pore volume distribution, and atomic adsorption spectroscopy (AAS) was used to determine the content of Cu metal. The test of catalytic activity on dehydration reaction of n-amylalcohol, was carried out in a flow reactor system at various temperatures. The results showed that the surface area and total pore volume increase with the longer time of intercalation process, and followed by increasing Cu content on active carbon. It was showed further that catalyst with highest Cu content, and the largest of both of surface area and total pore volume gives the best performance.
PREPARATION OF PT-ZEOLITE CATALYST FOR CONVERSION OF N-OCTANOL Sadiana, I Made; Falah, Iip Izul; Triyono, Triyono
Indonesian Journal of Chemistry Vol 1, No 2 (2001)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.21949

Abstract

Pt-zeolite catalyst has been prepared by immersing a sample of zeolite in PtCl4 solution. After separation, the sample was dried and calcinated at 550 °C for 4 hours under nitrogen stream. Furthermore, the sample was oxidized with oxygen gas at 350 °C for 2 hours and reduced with hydrogen gas at 400 °C for 2 hours. Total amount of impregnated metal, acidity and surface are of the samples were determined by using atomic absorption spectrophotometric, gravimetric and gas sorption methods, respectively. The activity test was done in a fixed bed reactor and the results of the reaction were analyzed by using gas chromatograph. The result of the characterization showed that the higher total amount of impregnated metal, the lower the surface area and total volume of pores. The acidity and the catalyst activity increase with the increasing of the total amount of impregnated metal. The flow rate of feed and temperature reaction also influence yield conversion. The optimum yield of n-octanol conversion was obtained at 400 °C with the showest flow rate of n-octanol and flow rate of H2 gas was equal to 40 mL/minute.
Analisis pengaruh penambahan ion H+ pada sintesis material mesopori Al-MCM-41 menjadi H-MCM-41 Tengker, Soenandar Milian Tompunu; Falah, Iip Izul
Jurnal Kimia Fullerene Vol 3 No 1 (2018): Fullerene Journal of Chemistry
Publisher : Chemistry Department State University of Manado

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Abstract

Sintesis material mesopori Al-MCM-41 dibuat menjadi H-MCM-41 telah dilakukan dengan cara mencampur sebanyak 5 gram Al-MCM-41 hasil sintesis ke dalam 100 ml larutan NH4Cl 0,5 M, kemudian disaring dan dicuci serta dikeringkan dalam oven pada suhu 80 oC selama 24 jam. Situs asam yang terkandung pada material mesopori H-MCM-41 adalah situs asam Brønsted (B) dan situs asam Lewis (L). Material mesopori H-MCM-41 hasil sintesis menunjukkan bentuk morfologi berupa pori heksagonal seperti sarang lebah (honeycomb). Hal ini juga memperjelas bahwa CTAB sebagai bahan pengarah struktur pori telah berhasil membentuk pori fasa heksagonal dari material mesopori H-MCM-41 hasil sintesis. Ukuran diameter pori dari material mesopori H-MCM-41 hasil sintesis adalah 2,88 Å diukur menggunakan mistar ukur berdasarkan skala gambar hasil analisis menggunakan TEM.
ESTIMATION OF PROTEIN CONCENTRATION IN FOOD BY TOTAL NITROGEN AND AMINO ACID ANALYSES ., Sumarno; Noegrohati, Sri; ., Narsito; Falah, Iip Izul
INDONESIAN JOURNAL OF PHARMACY Vol 13 No 1, 2002
Publisher : Faculty of Pharmacy Universitas Gadjah Mada, Yogyakarta, Skip Utara, 55281, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (194.079 KB) | DOI: 10.14499/indonesianjpharm0iss0pp34-43

Abstract

Since protein is the principal constituent of biological organs, a continuous supply is needed in food for growth and repair. Protein quality in food is determined by its assortment of amino acids, whether it is essentially needed or not. The aim of this study is to develop an accurate and precise simple method of protein estimation for food and feed. The validity of simple protein estimation by multiplying the N-total concentration with a constant factor: of 6.25, should be clarified. Protein could be estimated more specifically by summing up the determined amino acids. In this study, the amino acids of some substantially high protein food were analysed by HPLC-ninhydrin, HPLC-o-phthalaldehyde, and HPLC-dansyl techniques, by gas chromatograph after derivation with TFA-butanol, and by formol titration. Method based on HPLC-ninhydrin techniques shows significant correlation (r=0-9992) with its amino acids content and N-total content. The protein as amino acids - N-total conversion factor obtained was 6.95 for N-total content less than 15.5%, and 8.59 for N-total content higher than 15.5%.Key words: food, protein and analytical methods
Gasoline Production from Coconut Oil Using The Ni-MCM-41 and Co/Ni-MCM-41 Catalyst Badriyah, Lailatul; Falah, Iip Izul
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 2, No 1 (2017): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v2i1.8516

Abstract

Gasoline have been produced from coconut oil using MCM-41, NiMCM-41, and Co/NiMCM-41 catalyst. The acidity of catalyst was analysed by Fourier Transformation Infra-Red Spectroscopy (FTIR). The yields of cracking product were analysed by Gas Chromatography-Mass Spectroscopy (GC-MS). The catalyst of Co/NiMCM-41 has the highest acidity than MCM-41 and NiMCM-41. It is caused by the effect of adding d orbital from Co and Ni. This cracking process is batch system, and the catalyst pellets were made at the temperature of 400 ºC. The highest gasoline product was obtained using the Co/NiMCM-41 catalyst with 89.53 % w/w yield. The major liquid product from the cracking process using MCM-41, NiMCM-41, dan Co/NiMCM-41 catalysts were estimated as 1-octena, octane, nonane; 1-octene, 1-nonene, nonane; 1-octene, octane, nonane, respectively. 
SYNTHESIS OF MESOPOROUS CARBON FROM MERBAU WOOD (INTSIA SPP.) BY MICROWAVE METHOD AS NI CATALYST SUPPORT FOR α-CELLULOSE HYDROCRACKING Prasiwi, Andaru Dena; Trisunaryanti, Wega; Triyono, Triyono; Falah, Iip Izul; Santi, Darma; Marsuki, Muhammad Fajar
Indonesian Journal of Chemistry Vol 19, No 3 (2019)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.34189

Abstract

Synthesis of mesoporous carbon from Merbau wood (Intsia spp.) waste by microwave method as nickel catalyst support for ?-cellulose hydrocracking had been carried out. The Merbau wood sawdust was carbonized at 800 °C to produce C800 and the C800 was treated by microwave irradiation (399 W) for 5 min to produce C800MW. The Merbau wood flakes, which were only treated by microwave irradiation (399 Watts) for 30 min produced CMW. Wet impregnation technique was carried out to disperse the Ni metal (1.0, 1.5, and 2.0 wt.%) onto the best mesoporous carbon. The mesoporous carbons were analyzed by Fourier Transform Infra-Red Spectroscopy (FTIR), Surface Area Analyzer (SAA) and Scanning Electron Microscopy (SEM). The hydrocracking of pyrolyzed ?-cellulose was carried out at 400 °C. The liquid product was analyzed by Gas Chromatograph-Mass Spectrometer (GC-MS). The results showed that the C800MW was the best performance carbon and it had a specific surface area, total pore volume, average pore diameter and acidity of 364.12 m2/g, 0.28 cm3/g, 3.03 nm, and 2.18 mmol/g, respectively. The Ni1.5/C800MW catalyst produced the highest conversion of liquid product (58.76 wt.%) than the Ni1/C800MW (57.51 wt.%) and Ni2/C800MW (34.18 wt.%).
Determination of Antioxidant Activity and Phenolic Compounds of Methanolic Extract of Java Plum (Syzygium cumini Linn. (Skeel) Seed Rohadi, Rohadi; Santoso, Umar; Raharjo, Sri; Falah, Iip Izul
Indonesian Food and Nutrition Progress Vol 14, No 1 (2017)
Publisher : Indonesian Association of Food Technologists

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ifnp.24279

Abstract

Methanolic extract of Java Plum (Syzygium cumini L. (Skeel) seed (MEJS) is potential source of natural antioxidant. As indicated by several in vitro measurements, the extract had strong DPPH (1,1 diphenyl, 2–picryl hydrazyl) and ABTS (2,2-azinobis, 3-ethylbenzothiazoline-6-sulphonate) radical scavenging activity, strong Ferric Reducing Antioxidant Power (FRAP) and moderate inhibition activity of linoleic acid oxidation. This study aimed to determine antioxidant activity and phenolic compound of Java Plum seed (Syzygium cumini L. (Skeel) methanolic extract fractions. Phenolics compound identification using Thin Layer Chromatography (TLC) showed that all fractions (polar, semi polar and hydrolyzed semi polar fraction) contained Gallic acid, Tannic acid and flavonol’s Rutin. HPLC-DAD analysis showed that its polar fraction contained 25 ppm flavonol’s Quercetine and 55181 ppm flavonol’s (+)- Catechin, ethyl acetate fraction contained 54 ppm flavonol’s Rutin and 528 ppm (+)- Catechine, while hydrolyzed ethyl acetate fraction contained 404 ppm Rutin and 28692 ppm (+)- Catechine.
Wormhole-Like Mesoporous Carbons from Gelatine as Multistep Infiltration Effect Ulfa, Maria; Trisunaryanti, Wega; Falah, Iip Izul; Kartini, Indriana
Indonesian Journal of Chemistry Vol 16, No 3 (2016)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (227.776 KB) | DOI: 10.22146/ijc.21137

Abstract

Wormhole-like mesoporous carbon from gelatine (WMCG) with two different pore diameters have been synthesized by adopting a modified infiltration treatment. The infiltration effect on the morphology was investigated. The results show that the WMCG sample was obtained after dehydration, pyrolysis and silica removal process. The pore diameters WMCG are 15.2 and 4.8 nm with specific surface areas of 280 m2/g, total pore volumes of 0.5 cm3/g and the thermal stability up to 1400 °C. The bimodal pore of WMCG obtained as the high step of infiltration level effect.
Reversible Second Order Kinetics of Sorption-Desorption of Cr(VI) Ion on Activated Carbon from Palm Empty Fruit Bunches Falah, Iip Izul; Ruliatima, Ruliatima; Triyono, Triyono
Indonesian Journal of Chemistry Vol 15, No 3 (2015)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (325.388 KB) | DOI: 10.22146/ijc.21198

Abstract

Activated carbon (AC) from palm empty fruit bunches has been prepared, and this material was then used to adsorb Cr(VI) from a solution. Characterization of the AC was conducted by detection of its functional groups, determination of total volatile compounds (VC) content and its iodine number. Study on sorption-desorption kinetics was conducted by comparing results of evaluations of several models with proposed reversible second order model using the data produced in this work. Results of the works showed that the AC had similar characters compared with the AC produced by previous researchers. Application of the kinetics models on sorption Cr(VI) onto the AC showed that nearly all of the models gave a good linearity. However, only the proposed model had a good relation with Langmuir isotherm, with respectively sorption (ks) and desorption (kd) constants were 5.75 x 10-4 L.mg‑1.min-1 and 2.20 x 10-3 min-1; maximum sorption capacity, qm = 20.00 mg.g-1; and equilibrium constant, K from kinetics experiment (0.261 L.mg-1) was comparable with the result from the isotherm experiment (0.269 L.mg-1). Hence, using this model, kinetics and Langmuir parameters can probably be determined from a single kinetics data experiment.