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Jumina,Ifa Amalina,Sugeng Triono,Yehezkiel Steven Kurniawan,Yoga Priastomo,Keisuke Ohto,Bohari M. Yamin 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.3
At present, biodiesel remains an untapped fuel source while crude oil reserves are being depleted. Extensive efforts are necessary to achieve efficient biodiesel production, but catalytic activity in methyl palmitate production remains unsatisfactory. In this study, we report the synthesis and organocatalyst activity of C-arylcalix[4]-2-methylresorcinarene sulfonic acids for biodiesel production. The presence of a methyl group on an aromatic ring is expected to disturb the intramolecular hydrogen bonds; thus, each hydroxyl group could be utilized for the catalytic process. C-arylcalix[4]-2-methylresorcinarene sulfonic acids were prepared from cyclocondensation and sulfonation reactions yielding compounds 1?6 at rates of 66.7%?86.6%. By evaluating the organocatalytic activity of the C-arylcalix[4]-2-methylresorcinarene sulfonic acids, we found that 4?mol% of compound 5 exhibited the highest yield (97.8%) of methyl palmitate at 338?K for 6-h reaction time, which is remarkable. These findings show that C-arylcalix[4]-2-methylresorcinarene sulfonic acids are promising heterogeneous catalyst materials for biodiesel production.
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Science and Technology Progress on the Desulfurization Process of Crude Oil
Jumina,Yehezkiel Steven Kurniawan,Bambang Purwono,Dwi Siswanta,Yoga Priastomo,Agustinus Winarno,Joko Waluyo 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.8
Currently, crude oil still remains an irreplaceable energy source for chemical industrial processes, transportation systems, electricity, and other human activities. However, crude oil contains sulfur elements as the major impurities in the form of aliphatic and aromatic organosulfur compounds. During the combustion of fuel, these organosulfur compounds are converted to harmful SOx gases; thus, many countries strictly limit the maximum sulfur content in the fuels. To fulfill the government regulation, refineries are trying to decrease the maximum sulfur content in crude oil through several desulfurization technologies, such as hydrodesulfurization, adsorption, oxidative-desulfurization, alkylation, and biodesulfurization. Each desulfurization technology has its own advantages and disadvantages. In this review article, we aimed to briefly summarize the progress in the developing science and technology of each desulfurization process of crude oil. Several fields in the desulfurization process are still facing challenges to create better designs and development for a safer future of the world.
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Adsorption Characteristics of Pb(II) and Cr(III) onto C-Methylcalix[4]resorcinarene
Jumina, Jumina,Sarjono, Ratnaningsih Eko,Siswanta, Dwi,Santosa, Sri Juari,Ohto, Keisuke Korean Chemical Society 2011 대한화학회지 Vol.55 No.3
C-Metylcalix[4]resorcinarene(CMCR)에서 Pb(II)와 Cr(III)의 흡착 특징에 대한 연구는 수행되어왔다. CMCR은 resorcinol, acetaldehyde 그리고 HCl로 부터 1단계 합성으로 만들어졌다. 일괄처리시스템에서 대부분의 변수는 CMCR이 Pb(II)와 Cr(III)에 대해 좋은 흡착제라는 것을 확인했다. Cr(III)은 Pb(II)보다 더 크게 흡착되지만 Cr(III)의 흡착속도는 Pb(II) 보다 더 느리다. Pb(II)와 Cr(III) 흡착의 흡착운동에너지는 batch안에서 유사 2차 운동 모델을 따른다. 그러나 고정상 컬럼 시스템에서 Pb(II)의 운동에너지는 일차 모델을 따른다. 흡착된 Pb(II)을 되찾기 위한 탈착 연구는 증류수와 HCl을 가지고 순차적으로 수행되었다. 그리고 그 결과는 흡착은 화학흡착에 의해 지배된다는 것을 보여주었다. A study on the adsorption characteristics of Pb(II) and Cr(III) cations onto C-methylcalix[4]resorcinarene (CMCR) has been conducted. CMCR was produced by one step synthesis from resorcinol, acetaldehyde, and HCl. Most parameters in batch system confirm that CMCR is a good adsorbent for Pb(II) and Cr(III). Cr(III) uptake was bigger than that of Pb(II), but Cr(III) adsorption rate was slower than Pb(II). The adsorption kinetic of Pb(II) and Cr(III) adsorptions in batch followed pseudo $2^{nd}$ order kinetics model, but the kinetic of Pb(II) adsorption in fixed bed column system followed first order model. Desorption studies to recover the adsorbed Pb(II) was performed sequentially with distilled water and HCl, and the results showed that the adsorption was dominated by chemisorption.
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( Setiawati Setiawati ),( Titik Nuryastuti ),( Ngatidjan Ngatidjan ),( Mustofa Mustofa ),( Jumina Jumina ),( Dhina Fitriastuti ) 한국균학회 2017 Mycobiology Vol.45 No.1
Metal-based drugs, such as 1,10-phenanthroline, have demonstrated anticancer, antifungal and antiplasmodium activities. One of the 1,10-phenanthroline derivatives compounds (1)-N-2-methoxybenzyl-1,10-phenanthrolinium bromide (FEN), which has been demonstrated an inhibitory effect on the growth of Candida spp. This study aimed to explore the in vitro antifungal activity of FEN and its effect on the membrane integrity of Candida albicans. The minimum inhibitory concentration (MIC) and the minimum fungicidal concentration (MFC) of FEN against planktonic C. albicans cells were determined using the broth microdilution method according to the Clinical and Laboratory Standards Institute guidelines. Cell membrane integrity was determined with the propidium iodide assay using a flow cytometer and were visualized using scanning electron microscopy (SEM). Planktonic cells growth of C. albicans were inhibited by FEN, with an MIC of 0.39-1.56 μg/mL and a MFC that ranged from 3.125 to 100 μg/mL. When C. albicans was exposed to FEN, the uptake of propidium iodide was increased, which indicated that membrane disruption is the probable mode of action of this compound. There was cells surface changes of C. albicans when observed under SEM.
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Hamza M. Abosadiya,Siti Aishah Hasbullah,Jumina,Bohari M. Yamin 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.12
C-4-acetamidophenylcalix[4]-2-methylresorcinarene was synthesized by condensation reaction of 2-methylresorcinol with 4-acetamidobenzaldehyde in the presence of concentrated HCl. The compound was characterized by infrared (IR), 1H, and 13C NMR spectroscopy. Single crystal X-ray analysis revealed that the molecule crystallized in a triclinic crystal system with space group of Pī and the unit cell dimensions are a = 8.929(1) Å, b = 13.804(2) Å, c = 14.471(2) Å, α = 76.766(4)°, β = 78.563(4)°, γ = 87.168(4)°, Z = 1, and V = 1702.0(4) Å3. The calix molecule is associated with four dimethylsulfoxide (DMSO) and two water molecules of crystallization that contribute to the stability of the solid via hydrogen bonding. The supramolecule adopts a chair (C2h ) conformation with four phenyl linkage groups that are in rctt (cis–trans–trans) configuration isomer. The thermal gravimetric investigation showed three mass loss steps that occurred at about 100, 400, and 900 °C, respectively. The compound formed after the first loss is thermally stable in the range of 100–400 °C after which the calix moiety began to decompose.
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