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All Journal Reaktor Jurnal Teknik Kimia USU Prosiding Semnastek Communications in Science and Technology Jurnal Teknik Kimia Indonesia Jurnal Teknik Kimia USU Makara Journal of Technology
Rita Arbianti
Chemical Engineering Department, Engineering Faculty, Universitas Indonesia, Kampus UI Depok 16424
Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Journal : Makara Journal of Technology

 1 
Cetane Number Booster Additive for Diesel Fuel Synthesized from Coconut Oil Nasikin, Mohammad; Arbianti, Rita; Azis, Abdul
Makara Journal of Technology Vol. 6, No. 2
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To reduce NOx, SOx, HC, and particulates that produce because of using diesel fuel, can be done by increasing cetane number. One of methods is adding an additive to diesel fuel. 2-Ethyl Hexyl Nitrate (2-EHN) is a commercial additive that an organic nitrate. Making an additive in this research is used palm oil by nitration reaction that used HNO3 and H2SO4. Result of this reaction is methyl ester nitrate that has a structure looks like 2-EHN. IR spectra from research show that methyl ester nitrate is indicated by spectrum NO2 at 1635 cm-1. This result show that methyl ester nitrate can be synthesized by nitration reaction and yield is 74,84% volume. Loading 1% methyl ester nitrate to diesel fuel can increase cetane number from 44,68 to 47,49.
Kinetic Model For Triglyceride Hydrolysis Using Lipase:Review Hermansyah, Heri; Wijanarko, A.; Dianursanti, Dianursanti; Gozan, Misri; Wulan, Praswasti P. D.K; Arbianti, Rita; Soemantojo, Roekmijati W.; Utami, Tania Surya; Yuliusman, Yuliusman; Kubo, Momoji; Kitakawa, Naomi Shibasaki; Yonemoto, Toshiy
Makara Journal of Technology Vol. 11, No. 1
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Triglyceride hydrolysis using lipase has been proposed as a novel method to produce raw materials in food and cosmetic industries such as diacylglycerol, monoacylglycerol, glycerol and fatty acid. In order to design a reactor for utilizing this reaction on industrial scale, constructing a kinetic model is important. Since the substrates are oil and water, the hydrolysis takes place at oil-water interface. Furthermore, the triglyceride has three ester bonds, so that the hydrolysis stepwise proceeds. Thus, the reaction mechanism is very complicated. The difference between the interfacial and bulk concentrations of the enzyme, substrates and products, and the interfacial enzymatic reaction mechanism should be considered in the model.
Isolation of Methyl Laurate from Coconut Oil as Raw Material for Fatty Alcohol Sulfate Arbianti, Rita; Utami, Tania Surya; Nugroho, Astri
Makara Journal of Technology Vol. 12, No. 2
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Isolation of Methyl Laurate from Coconut Oil as Raw Material for Fatty Alcohol Sulfate. Methyl laurate is a raw or base material for many industries, including surfactant industries. In this research, coconut oil (VCO) is transesterified with methanol to produce methyl ester, using NaOH as the catalyst. Methyl laurate is then separated by method based on the difference in melting point. This research focuses at determining the effects of some variables in transesterification on the concentration of produced methyl laurate. The variables are temperature (40 oC, 50 oC, 60 oC, 80 oC), time of transesterification reaction (0,5 hour, 1 hour, 1,5 hours, 2 hours, 3 hours), and the percent weight of the catalyst NaOH (0,5 %, 1 %, 1,5 %, 2 %, 3 %). Research showed the concentration of methyl laurate increased, following the increased temperature, time, and percent weight of catalysts. Optimal conditions were acquired at reaction temperature of 60oC, reaction time of 2 hours, and percent weight of the catalyst NaOH of 2 %. Laurate acid conversion to methyl laurate that yielded from optimal conditions, after the separation based on melting point, was 55,61 %.
Performance Optimization of Microbial Fuel Cell (MFC) Using Lactobacillus bulgaricus Arbianti, Rita; Utami, Tania Surya; Hermansyah, Heri; Novitasari, Deni; Kristin, Ester; Trisnawati, Ira
Makara Journal of Technology Vol. 17, No. 1
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Electrical energy needs in Indonesia are expected to continue to rise. The use of petroleum as a source of energy still dominates, although oil reserves in Indonesia are increasingly being depleted. Therefore, there is a need to develop alternative sources of sustainable energy, such as microbial fuel cell (MFC). In this study, Lactobacillus bulgaricus was used as an electricity producer in a dual-chamber MFC reactor. We investigated the maximum electrical energy by varying the bacterial optical density (OD), the operational time of MFC, the reactor volume, the electrolyte solution, and the configuration of MFC reactor. In this study, the maximum electrical energy (201.8 mW/m2) was generated at an OD of 0.5 in an MFC reactor series using potassium permanganate as the electrolyte solution.
Improvement of Quality of Carica papaya L. with Clove Oil as Preservative in Edible Coating Technology Kusrini, Eny; Usman, Anwar; Wisakanti, Chrispine Deksita; Arbianti, Rita; Nasution, Dedy Alharis
Makara Journal of Technology Vol. 19, No. 3
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We have studied utilization of essential clove oil, extracted from clove buds by hydrodistillation, as preservative in edible packaging technology. Preservative of essential clove oil was applied on chopped papaya fruits by using two methods, namely spray and brush. The effects of concentration of clove oil from 0.05 to 0.20% on the preservation of papaya fruits (Carica papaya L.) at room temperature (25 °C) were also evaluated. Physicochemical and in vitro microbiological activities on the papaya fruits that were stored at 25 oC and 85-90% relative humidity were investigated in details. The results indicate that the clove oil at concentration ≥0.10% suppressed the decay time, 10% weight loss, 0.03 g citric acid/100 g in acidity titration test, and 20% pH value from those of control sample of papaya fruits kept in a storage. The population of fungi and bacteria were efficiently reduced by 90% when the clove oil at concentration ≥0.10% was applied as preservative on papaya fruits. This finding suggested that the extracted essential clove oil acted as effective antifungal and antibacterial agents. Preservative by essential clove oil improved the quality of fruits to extend the product shelf life and to reduce the risk of microbial growth on fruits surface.
Co-Authors A.A. Ketut Agung Cahyawan W Abdul Azis Adinda Putri Wisman, Adinda Aida R. Pudjiastuti Anandho Wijanarko Angelina Annisa Kurnia, Annisa Anondho Wijanarko Anondho Wijanarko Anwar Usman, Anwar Astri Nugroho Astri Nugroho Beta Nadia Manaf, Beta Chrispine Deksita Wisakanti, Chrispine Deksita Daryanto Daryanto Dedy Alharis Nasution, Dedy Alharis Deni Novitasari Deni Novitasari, Deni Desti Andani Dianursanti Diki Firdaus, Diki Eki Listya Rini Eny Kusrini Ester Kristin Ester Kristin, Ester Fadilah Putri, Najah Guruh Mehra Mulyana Hanung Adi Nugroho Heri Hermansyah Ira Setiawati Ira Trisnawati Ira Trisnawati, Ira Kitakawa, Naomi Shibasaki Luh Putu Ratna Sundari M Mariana Maemonah, Maemonah Misri Gozan Mohammad Nasikin Momoji Kubo Momoji Kubo, Momoji Naomi Shibasaki-Kitakawa Naomi Shibasaki-Kitakawa, Naomi Nathania Dwi Karina Naufal Azrizal Prasetyo Ng Sha Shiong Praswasti P. D.K Wulan Praswasti P. D.K Wulan, Praswasti P. D.K Purwati Latifah, Linatri Randi Sitorus Roekmijati W. Soemantojo Roekmijati W. Soemantojo, Roekmijati W. Septian Marno Slamet Slamet . Slamet Slamet Sri Amini Suryapranata, Bryan Tania S Utami Tania Surya Utami Tania Utami Tania Utami, Tania Toshiy Yonemoto Toshiy Yonemoto, Toshiy Vifki Leondo Wijanarko, A. Wiwik Handayani Yoki Yulizar Yosmarina Harahap Yuliusman Yuliusman Yuswan Muharam