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All Journal SAINS DAN MATEMATIKA JURNAL KIMIA SAINS DAN APLIKASI Indonesian Journal of Chemistry Jurnal Pengabdian Kepada Masyarakat (JPKM) Tabikpun Greensphere: Journal of Environmental Chemistry Analit: Analytical and Environmental Chemistry Analit: Analytical And Environmental Chemistry
Linda Suyati
Department Of Chemistry, Faculty Of Science And Mathematics, Diponegoro University, Jl. Prof. H. Soedarto, S.H., Tembalang Semarang 50275, Indonesia
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Education Energy Engineering Environmental Science Health Professions Mathematics

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Journal : SAINS DAN MATEMATIKA

 1 
Effect of Series Circuit on the Lactose Bioelectricity of a Microbial Fuel Cell System using Lactobacillus bulgaricus Hayati, Dini Noor; Nuryanto, Rahmad; Suyati, Linda
JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 3 Year 2015
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

The need for alternative energy, especially electricity at this time is increasing. The decreasing amount of fuel that cannot be updated, encouraging scientists to conduct researches in finding alternative energy sources which are environmentally friendly, one of the alternative energy is the Microbial Fuel Cell (MFC). The research on the effects of a series circuit on the production of lactose bioelectricity microbial fuel cell system using Lactobacillus bulgaricus has been conducted. This study aim was to assess the effect on the production series circuit lactose bioelectricity MFC system using microbes Lactobacillus bulgaricus. Stages of research included a microorganism preparation of Lactobacillus bulgaricus, and measuring the potential difference in a single, series 1 and series 2 circuits in the MFC system. The potential difference on the measurement of a single, series 1 and series 2 on the substrate lactose were 45 mV / 100mL; 57 mV / 100mL; 58 mV / 100mL respectively where the power were 105.75x10-6 mW; 136x10-6 mW; 139.2x10-6 mW. These results suggested that series circuit was able to increase the potential difference and power on the substrate lactose and tofu whey the MFC system according to Ohm’s law. Keywords: Lactose, microbial fuel cell, Lactobacillus bulgaricus, a series circuit
The Bioelectricity of Tofu Whey in Microbial Fuel Cell System with Lactobacillus bulgaricus Inayati, Nor Sri; Aminin, Agustina L. N.; Suyati, Linda
JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 1 Year 2015
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Tofu whey is a byproduct of the manufacturing process tofu which containing the remains of protein, fat, carbohydrates and water-soluble substances that do not agglomerate. This study aim was to assess the potential of tofu whey as a substrate in the MFC system and to evaluate the effect of agitation speed to the potential difference generated in the MFC system using Lactobacillus bulgaricus. The potential difference in the variation of the substrate was measured against tofu whey, glucose and lactose. The potential difference with agitation speed variation was carried out at speed of 30, 60, 90, 125 and 250 rpm. The highest potential differences in the substrate variation showed relatively similar results, however they were achieved in different times, which the speed was dependent on the complexity of the substrate molecular structure. While the agitation of 90 rpm gave the highest potential difference. These results indicates that tofu whey potential to be used as a MFC substrate.
Studi Pendahuluan Pemanfaatan Whey Tahu sebagai Substrat dan Efek Luas Permukaan Elektroda dalam Sistem Microbial Fuel Cell Sinaga, David Hamonangan; Suyati, Linda; Aminin, Agustina L. N.
JURNAL SAINS DAN MATEMATIKA Volume 22 Issue 2 Year 2014
Publisher : JURNAL SAINS DAN MATEMATIKA

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Studi ini bertujuan mengkaji potensi whey tahu sebagai substrat menggunakan Saccharomyces cerevisiae dan mempelajari pengaruh luas permukaan elektroda dalam menghasilkan beda potensial pada sistem MFC. Tahapan penelitian meliputi konstruksi reaktor MFC, pengukuran beda potensial pada variasi substrat yaitu membandingkan beda potensial yang dapat dihasilkan oleh substrat whey tahu dengan substrat glukosa, dan pengukuran beda potensial pada variasi luas permukaan elektroda dengan masing-masing luas permukaan elektroda grafit sebesar 13,29 cm2, 26,58 cm2, 39,87 cm2, dan 53,16 cm2. Hasil penelitian menunjukkan bahwa whey tahu memiliki potensi dengan dihasilkannya beda potensial maksimum 11,73 mV/100 ml substrat dalam sistem MFC menggunakan S. cerevisiae. Hasil studi juga menunjukkan bahwa semakin besar luas permukaan elektroda, semakin besar pula beda potensial yang dihasilkan. Hal ini dibuktikan dengan luas elektroda grafit 53,16 cm2 menghasilkan beda potensial 40,67 mV/100 mL substrat whey tahu dan 300 mV/100 mL substrat glukosa.   Kata kunci: Whey tahu, Microbial fuel cell, Saccharomyces cerevisiae, dual-chamber MFC    The preliminary research about the utilization of soy whey as a substrate and the effect of electrode surface area in microbial fuel cell (MFC) system has been conducted. Laboratory-scale experiment of MFC was carried out in order to determine the ability of soy whey to act as substrate using Saccharomyces cerevisiae and the influence of electrode surface area to generate a potential difference in MFC system. The study includes the MFC reactor design, measuring a potential difference at variation of substrate (soy whey and glucose), and evaluate a potential difference at a variation of graphite electrode surface area. The results show that soy whey has an ability to be applied as a substrate in the MFC system using S. cerevisiae with potential difference 11,73 mV/100 ml. The variation of electrode surface area in the MFC system with four graphite electrodes (53.16 cm2) give the best potential difference with 40,67 mV/100 ml of soy whey and 300 mV/100 ml of glucose substrate.   Keywords: Soy whey, Microbial fuel cell, Saccharomyces cerevisiae, dual-chamber MFC
Whey Tahu sebagai Penghasil Biolektrisitas pada Sistem Microbial Fuel Cell dengan Lactobacillus Plantarum Ismawati, Nur; Aminin, Agustina L. N.; Suyati, Linda
JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 2 Year 2015
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

Bioelectricity of soy whey in Microbial Fuel Cell system with Lactobacillus plantarum has been performed. This study aims to determine the capacity of soy whey as a substrate in the MFC system and determine the influence of the speed of agitation against potential difference generated. The potential difference compared to different substrates, namely soy whey, glucose and lactose. Determination of the potential difference in speed variation agitation performed with variations 30, 60, 90, 125 and 250 rpm. The potential difference at the maximum voltage variation of the substrate obtained by soy whey by 33.3 mV / 100 mL at the 15th hour, whereas glucose and lactose reaches the maximum potential difference at the 12th hour with a relatively similar value. Agitation speed that generates the highest potential difference in soy whey substrate was obtained at 90 rpm with maximum potential difference of 63.1 mV / 100mL at the 14th hour.
Pengaruh Konsentrasi Kalium Asetat dan Natrium Asetat terhadap Konduktivitas Elektrolit Padat KMn(2-x)Mgx O2 dan NaMn(2-x)MgxO2 Nuryanto, Rahmad; Suyati, Linda; Harjono, Cipto; Anggrayni, Rahmaniar
JURNAL SAINS DAN MATEMATIKA Volume 21 Issue 2 Year 2013
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Abstract

Pembuatan elektrolit padat KMn(2-x)Mgx O2 dan NaMn(2-x)MgxO2 dilakukan dengan metode sol-gel dengan variasi konsentrasi Kalium Asetat dan Natrium Asetat. Kalium Asetat dan Natrium Asetat dengan konsentrasi 0,1 sampai 0,5 masing-masing dicampur dengan larutan Mangan Asetat, Magesium asetat dan asam sitrat. Larutan-larutan tersebut diaduk selama 2 jam, kemudian dievaporasi dengan temperatur  80°C selama 2 jam, selanjutnya dilakukan drying dengan temperatur 175°C dan kalsinasi dengan temperatur 650°C. Hasilnya berupa padatan diuji konduktivitas dan gugusn fungsinya dengan FTIR. Hasil Penelitian menunjukkan bahwa konduktivitas tertinggi dari elektrolit padat KMn(2-x)Mgx O2 dan NaMn(2-x)MgxO2 diperoleh pada konsentrasi Kalium Asetat 0,1 M dan Natrium asetat 0,1 M. Hubungan antarakonsentrasi(c) dengan konduktivitas (k) untuk KMn(2-x)Mgx O2 adalah c = -64,05 +42,3 dan untuk NaMn(2-x)MgxO2 c = -269,45k +222,85.   Keywords: Elektrolit padat, Sol-gel, KMn(2-x)Mgx O2 , NaMn(2-x)MgxO2, konduktivitas
Lactose Bioelectricity on A Microbial Fuel Cell System Parallel Circuit using Lactobacillus bulgaricus Adi Putra; Rahmad Nuryanto; Linda Suyati
JURNAL SAINS DAN MATEMATIKA Volume 22 Issue 4 Year 2014
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

Electrical energy needs in Indonesia is estimated to continue growing by 4.6% per year, and if there is nothing to be done to increase the production of electric energy, this figure will increase threefold by 2030. Microbial Fuel Cells (MFC) is one way to produce alternative electric energy by utilizing organic material as a substrate for bacterial metabolic activity that generate electricity. The aim of this study is to examine lactose bioelectricity in a parallel circuit MFC system using Lactobacillus bulgaricus to generate electrical energy. The principle of this study is bioelectrochemistry which is the chemical energy change into electrical energy involving redox reactions by utilizing microbes. This study used a dual chamber MFC system with salt bridge as a connector and conductor of protons from the cathode compartment to the anode compartment. An anode compartment contained the bacteria Lactobacillus bulgaricus and lactose substrate, while the cathode compartment contained electrolyte solution KMnO4 0.2 M and phosphate buffer solution with pH = 7. This study used a single circuit, parallel circuit 1 with 2 cells, and a parallel circuit 2 with 3 cells which were oriented to enlarge the produced electricity current. Bioelectricity of lactose produced power in a single series, parallel 1 and parallel 2 respectively were 72.58 x10-6 mWatt; 155.77 x10-6 mWatt; 270.28 x10-6 mWatt where the power generated was proportional to the parallel circuit electric current. Hence by the same potential difference, the power magnitude in parallel circuit 1 approached twice to the single circuit and the power magnitude in parallel circuit 2 approached three times to the single circuit
Co-Authors Abdul Haris Abdul Haris Abdul Haris Adi Darmawan Adi Putra Agustina L.N. Aminin Brigita Maria Listyani Cipto Harjono David Hamonangan Sinaga Didik Setiyo Widodo Didik Setyo Widodo Dini Noor Hayati, Dini Noor Dwi Prakoso Dwijayanti, Umi Eki Khaerul Fikri Fardhani, Dea Ayu Gunawan Gunawan Gunawan Gunawan Gunawan Gunawan Hidayat, Alvin Romadhoni Putra khabibi Khabibi Marcelinus Christwardana Nabila Nurdiantika Nor Sri Inayati, Nor Sri Nur Ismawati, Nur Nurmanita Rusmaningsih Patmawati Patmawati, Patmawati Rahmad Nuryanto Rahmaniar Anggrayni Retno Ariadi Lusiana Rianasari, Ajeng Dyah Richard Leonardo Sianturi Risky Haerul Imam Rukmi, Pramastuti Adiar Salsabila, Salsabila Sriatun Sriatun Taslimah Taslimah Taslimah Taslimah Umi Dwijayanti Umi Fadilah, Umi W H Rahmanto W.H Rahmanto Widodo, Didik Setyo Wilman Septina Wulandari, Chintami Aurora Yayuk Astuti