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Dikdik Mulyadi
Universitas Muhammadiyah Sukabumi
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Public Health Social Sciences Other

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Identifikasi Potensi Enzim Lipase dan Selulase pada Sampah Kulit Buah Hasil Fermentasi La Ode Sumarlin; Dikdik Mulyadi; . Suryatna; Yoga Asmara
Jurnal Ilmu Pertanian Indonesia Vol. 18 No. 3 (2013): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (221.721 KB)

Abstract

Fermentation is one of bioconversion to produce profitable anaerobic microbes and to produce various enzymes. Lipases and cellulases are widely used enzymes so far. Cellulases play an important role in bioconversion of organic waste cellulosic materials to glucose, single cell proteins, animal feed, and ethanol. Lipases can also degrade fatty ester bond. Therefore, both enzymes are potential to be used in industry as well as in households. Fermentation of fruit peel waste is an attempt to produce cellulase and lipase that can be carried out in a simple way. Cellulase as says was performed using DNS (3.5-dinitrosalicylic acid) and acid-base titration for analysis of lipase using cooking oil as the substrate. The results showed that the highest cellulase activity was obtained from watermelon rind mixed with citrus fruit peel of 0.036 U/mL, and mixed of banana peel and citrus fruit, which was 0.035 U/mL. The optimum lipase activity was at 30 oC, pH 7, and reaction time of 60 minutes. The highest lipase activity (1.36 U/mL) was obtained from mixture of watermelon and orange rind. Thus, the fruit peel waste is potential to produce cellulase and lipase by fermentation .
Pengaruh Aktivasi Arang Aktif dari Tongkol Jagung dan Tempurung Kelapa Terhadap Luas Permukaan dan Daya Jerap Iodin Lela Mukmilah Yuningsih; Dikdik Mulyadi; A Jaka Kurnia
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 2, No. 1, Mei 2016
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v2i1.3091

Abstract

The activated charcoal can be produced from various raw material which contains carbon such as corn cobs and coconut shell. Generally, activated charcoal made through activation process with added chemical materials. The kind of activator will give different influence on surface area or pores volume of the result activated charcoal. In this study, will be made activated charcoal from corn cobs and activated by physical and chemical with KOH activator. Carbonation process is performed at 800oC for 2 hours and followed by chemical activation process by KOH with mass ratio water: charcoal: KOH is 1:1:4, then activated by physical at 600oC for 4 hours. Conducted test on sample contain iodine adsorption and SEM. As a result, iodine adsorption of activated charcoal indicated at KOH 20%. the best adsorption of coconut shell activated charcoal is 1240.233 mg/g with surface area 2352.851 m2/g, while corn cobs activated charcoal is 1133.757 mg/g with surface area 2150.866 m2/g. Morphology of activated charcoal with KOH 20% have pore structure with high 22.63 µm and wide 26.41 µm, the resulting pore size included into macropores structure. Keywords: Activated charcoal, carbonation, activation, adsorption, surface area. DOI: http://dx.doi.org/10.15408/jkv.v2i1.3091
Preparation and Characterization of Chitosan Membranes from Crab Shells (Scylla olivacea) for Beverage Preservative Reni Mulyani; Dikdik Mulyadi; Nopriana Yusuf
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 5, No. 2, November 2019
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (734.623 KB) | DOI: 10.15408/jkv.v5i2.10637

Abstract

Chitosan can extend the shelf life of food and can be used in food preservation. Chitosan is derived from the shell of the animal crustacean, and is a derivative of the chitin polymer. This study aimed to determine the effectiveness of the use of chitosan membrane as an antibacterial compound and its application in pineapple juice products. Chitosan isolation is carried out through three stages, namely deproteination, demineralization, and deacetylation. Determination of the degree of deacetylation using the infrared spectroscopy method and the preservative effectiveness test was carried out based on SNI 01-2332.3-2006 concerning the testing of the Total Plate Count (ALT). Crab chitosan obtained from white-brown isolation results, soluble in 1% acetic acid and the value of the degree of deacetylation (DD) of chitosan crab is 81%. The addition of 1.5% crab chitosan membrane to pineapple juice can reduce bacterial growth until the 20th day with a total plate value (ALT) of 9.1x103 CFU / ml.
SYNTHESIS OF POLYANILINE MICROCELLULOSE COMPOSITE Lela Mukmilah Yuningsih; Dikdik Mulyadi; Devia Indriani
Jurnal Kimia dan Kemasan Vol. 43 No. 1 April 2021
Publisher : Balai Besar Kimia dan Kemasan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24817/jkk.v43i1.6326

Abstract

In this study, the Polyaniline-Microcellulose composite was produced as a solid electrolyte. In the previous research, polyaniline-cellulose composite has been carried out. However, the electronegativity and electrical voltage are still below the conventional batteries. In order to increase its performance, a polyaniline-microcellulose composite was synthesized. The purpose of this research is to determine the effect of the Polyaniline-Microcellulose composite on its conductivity and voltage values. Microcellulose synthesis used a combination method of sulfuric acid hydrolysis with concentrations of  30%-64% and sonication. Polyaniline - Microcellulose composite was synthesized via polymerization of aniline using chemical oxidation and sonication. Microcellulose was characterized using particle size analyzer (PSA). Microcellulose and PANI-microcellulose composites were characterized using FTIR, SEM-EDX, and XRD. The conductivity values and electrical quantities of PANI-Microcellulose composite were measured using LCR-meter and Digital Multimeter, respectively. The diameter of the microcellulose particles were between 20 nm – 40,6 µm. Microcellulose and PANI-Microcellulose composites showed identical absorption bands, namely the stretching vibrations to-OH and CH (aliphatic), which were shown at wavelengths 3444.87 cm-1 and 2897.08 cm-1, two typical groups of cellulose. The typical groups of PANI are bending vibrations from N-H, stretching vibrations of C=C, C-N, and quinoid ring C=N at wavelengths 1566.20 cm-1, 1479.40 cm-1, 1300.02 cm-1, and 1141.86 cm-1. PANI-Microcellulose composite morphology showed that PANI had been dispersed on microcellulose and free from impurities. The degrees of crystallinity are 30.9343% for microcellulose and 14.6079% for PANI-microcellulose. The optimum conductivity value of PANI-microcellulose composite at a ratio of 1:10 is 0.036013 S/cm; the electrical voltage is 1.34 volts with an electric current of 83 mA.
Uji Efektivitas Formula E-Liquid Minyak Sereh Wangi (Cymbopogon nardus L.) sebagai Repelan terhadap Aedes aegypti Aji Achmad Saputra; Dikdik Mulyadi; Lela Lailatul Khumaisah
Chimica et Natura Acta Vol 8, No 3 (2020)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/cna.v8.n3.26257

Abstract

Formulasi e-liquid berbahan minyak sereh wangi (Cymbopogon nardus L.), analisis minyak sereh wangi dan e-liquid dengan GC-MS dan uji aktivitas e-liquid sebagai repelan terhadap nyamuk Aedes aegypti telah dilakukan. Minyak sereh wangi digunakan sebagai bahan tambahan e-liquid karena mengandung senyawa minyak atsiri berupa sitronelol, sitronelal dan geraniol yang memiliki kemampuan sebagai repelan terhadap nyamuk, sehingga diharapkan asap yang keluar dari e-liquid dapat menolak nyamuk. Konsentrasi minyak sereh wangi yang dibuat untuk formulasi e-liquid terdiri dari 0,25; 2,5; 5 dan 10%. Hasil uji efektivitas repelan e-liquid selama satu jam pengamatan diperoleh nilai 100% pada konsentrasi 10%.  Hasil analisis GC-MS diketahui bahwa pada minyak sereh wangi maupun e-liquid terdapat 3 senyawa di atas sehingga berpotensi sebagai repelan (penolak nyamuk). Uji aktivitas e-liquid sebagai repelan terhadap nyamuk Aedes aegypti dilakukan dengan variasi konsentrasi 0,25; 2,50; 5 dan 10% selama 24 jam pengamatan. Persentase kematian rata-rata nyamuk pada konsentrasi tertinggi sebesar 33% dengan nilai LC50 13% dan nilai LT50 62 menit.
Efektivitas Pemanfaatan Serbuk Gergaji dan Limbah Media Tanam Jamur (Baglog) sebagai Bahan Baku Pembuatan Biogas Dikdik Mulyadi; Lela Mukmilah Yuningsih; Desi Kusumawati
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 2, No. 1, Mei 2016
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (238.628 KB) | DOI: 10.15408/jkv.v2i1.3100

Abstract

Biogas is  one of energy   that can be produced by anaerobic fermentation of the organic compounds. The objective of this study was to determine the effectiveness of the utilization of waste of media  mushroom growth (baglog) with sawdust as raw material for biogas with  cow dung  activators. The study was conducted through anaerobic fermentation of the samples containing waste baglog (sample 1) and sawdust (sample 2), with the addition of cow manure activator to each sample. Both of these samples do anaerobic fermentation for 32 days, then measuring the volume of biogas every 4 days for 32 days. Methane content  in  samples 1 and 2 measured by  using gas chromatography. To see the effect of the addition of activators cow dung biogas volume measurement was  carried out with  cow dung without addition baglog waste and sawdust. The process of degradation baglog and sawdust with an activator of cow dung could be observed  in  some of the parameters through  total solids (TS), total volatile solids (TVS), volatile fatty acids (VFA), the degree of acidity (pH), and C/N ratio. The results showed that effectiveness of sample 1 resulted in the everage of total volume biogas 28% higher than  sample 2. The content of methane in  sample 1  and sampel 2  was 54% %, and 0.21% respectively. The fermentation process biogas production in this experiment  was carried out  at pH 7, with a value of TS, TVS and VFA showed a decrease  trend after the fermentation process,  C/N ratiowas  lower than the baglog waste sawdust until day 32 retention time. Keywords: Sawdust, baglog waste, biogas, fermentation, methane DOI : http://dx.doi.org/10.15408/jkv.v2i1.3100
IbM KECAMATAN SUKARAJA MENUJU DESA MANDIRI ENERGI [IbM SUKARAJA DISTRICTS TOWARDS AN ENERGY INDEPENDENT VILLAGE] Dikdik Mulyadi; Lela Mukmilah Y
Jurnal Sinergitas PKM & CSR Vol 2, No 1 (2017): October
Publisher : Universitas Pelita Harapan

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Abstract

Community service programs conducted in Sukamekar and Cisarua villages in Kecamatan Sukaraja has a theme "IbM Sukaraja Districts Towards an Energy Independent Village". The expected objective of the science and technology program for this community is to make the existing community in Sukaraja Sukabumi districts generally independent in the field of energy and particularly the villages of Sukamekar and Cisarua of Sukaraja Disticts. The method used by some stage of the electoral groups in each village based on the potential of cow dung waste, socialization biogas to a selected group, training and implementation of biogas installation and monitoring and evaluation of all activities conducted. The result of monitoring and evaluation of this activity shows that cow dung in Sukamekar and Cisarua villages of Sukaraja districts can be utilized to produce biogas that  used for cooking purposes IbM implementation provides some benefits in the field of economic, social, security and mastery of technology.
Pirolisis Limbah Plastik Polietilena Berdensitas Rendah Menggunakan Katalis Dolomit Tania Ardisa; Dikdik Mulyadi; Salih Muharam
SANTIKA is a scientific journal of science and technology Vol. 7 No. 2 (2017): SANTIKA
Publisher : The Faculty of Science and Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37150/jsa.v7i2.660

Abstract

Sampah plastik merupakan masalah utama yang merusak lingkungan.diIndonesia saat ini penanganan sampah plastik telah berkembang ke arah daurulang plastik tersier menjadi bahan bakar cair. Komposisi kimia plastik salahsatunya adalah HDPE dan LDPE.HDPE dan LDPE merupakan polimer yangterbentuk dari monomer polietilena. Pada penelitian ini rantai karbon polimerdiputuskan dengan cara pirolisis berkatalis dolomit untuk menghasilkan senyawakarbon dengan rantai karbon lebih pendek. Tujuan dari penelitian ini yaitumengetahui penambahan katalis terhadap volume bahan bakar cair pada limbahplastik LDPE dengan katalis dolomit dan mengetahui jenis bahan bakar cair yangdihasilkan oleh limbah plastik LDPE. Katalis dolomit di karakterisasi olehScanning Electron Microscopy–Energy Dispersive X-ray Spectroscopy(SEMEDX), dan bahan bakar cair yang dihasilkan dianalisis oleh Fourier TransformInfra Red (FTIR), Kromatografi Gas-Spektroskopi Massa (GC-MS) dankalorimeter. Hasil dari penelitian ini menunjukkan pemanasan katalis dolomitpada suhu 400oC adalah kondisi terbaik untuk menghasilkan bahan bakar cairdengan jumlah paling tinggi dan komposisi kimia susunan bahan bakar cairkomersial.
Pemanfaatan Kulit Manggis (Garcinia mangostana L.) sebagai Bioetanol Generasi Dua (G2) dengan Variasi Konsentrasi Ragi Melalui Metode Simultaneous Saccharification and Fermentation (SSF) Dikdik Mulyadi; Lela Laitul Khumaisah; Sugiarti Rahayu
Jurnal Teknik Mesin (Sinta 3) Vol. 20 No. 2 (2023): OCTOBER 2023
Publisher : Institute of Research and Community Outreach, Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9744/jtm.20.2.46-54

Abstract

Saat ini ketergantungan Indonesia terhadap energi fosil dalam memenuhi kebutuhan energi di dalam negeri masih tinggi. Di sisi lain, penggunaan bahan bakar fosil sebagai sumber energi nasional merupakan salah satu faktor penyumbang dalam peningkatan emisi gas rumah kaca yang merusak lingkungan. Beranjak dari hal tersebut, maka perlu adanya alternatif lain seperti penggunaan bioetanol yang lebih ramah lingkungan. Biomassa yang dimanfaatkan sebagai bioetanol dalam penelitian ini ialah kulit manggis karena kandungan lignin, selulosa, serta hemiselulosa berturut-turut sebesar 38.2; 30.7; 29.8% yang dapat dikonversi menjadi bioetanol generasi dua. Penelitian terkait pemanfaatan kullit manggis sebagai bioetanol belum banyak dilakukan, sehingga tujuan dari penelitian ini adalah mengetahui karakteristik dari bioetanol yang dihasilkan serta konsentrasi ragi yang paling optimum dalam menghasilkan volume bioetanol. Metode penelitian yang digunakan dalam produksi bioetanol adalah sakarifikasi menggunakan enzim selulase campuran Aspergillus niger dan Trichoderma reesei perbandingan 1:2 dan fermentasi dengan variasi konsentrasi ragi 2; 4; 6 g/100 mL. Proses karakterisasi menggunakan instrumen GC, AAS, pH meter, serta proses titrasi. Penelitian ini memberikan hasil bahwa variasi ragi 6% merupakan konsentrasi yang paling optimum dalam menghasilkan volume bioetanol sebanyak 160 mL.
Validation of Analytical Method of Testing Cefotaxime Sodium in Injection Powder Preparation by High-Performance Liquid Chromatography Aneu Aryani Pratiwi; Dikdik Mulyadi; Devi Indah Anwar
Berkala Ilmiah Kimia Farmasi Vol. 10 No. 2 (2023): December
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/bikfar.v10i2.47179

Abstract

Cefotaxime sodium was an antibiotic drug included in the third-generation cephalosporin group. The aim of this research was to validate the method used for the analysis of cefotaxime sodium injection powder using HPLC. Parameters performed in this study included system suitability, selectivity, linearity, accuracy, precision, robustness, Limit of Detection (LOD), and Limit of Quantitation (LOQ). In this study, the mobile phase used was phosphate buffer pH 6,25 with methanol in the ratios of (30:70), (40:60), (50:50), (60:40), and (70:30) v/v. The analysis was carried out using a 150 × 4,6 mm 5μm C18 column and phosphate buffer pH 6,25 with methanol (40:60) v/v as a mobile phase with a flow rate of 1 mL/min, and a detector at a wavelength of 235 nm. The results showed that the system suitability test results met the requirements, with a plate number of 2288, a standard deviation of 0,93%, and a tailing factor of 1,3. The linearity results met the requirements of r ≥ 0,999 with LOD and LOQ values of 3,3894 ×10⁻⁴ mg/mL and 1,0271 ×10⁻³ mg/mL, respectively. The accuracy results obtained a recovery value of 99,30% and an RSD of 0,48%. Precision results of repeatability and intermediate precision had RSDs of 0,38% and 0,85%, respectively. Robustness test results obtained a recovery value of 100,25% and an RSD of 0,85%. The results showed that the recovery values (98-102%) and RSD ≤ 1,5% were in accordance with the validation requirements. It was concluded that the validation of the proposed method was recommended and could be used for routine analysis. Keywords:  Cefotaxime Sodium, Method Validation, HPLC
Co-Authors . Suryatna A Jaka Kurnia Agustina, Rosita Aji Achmad Saputra Aneu Aryani Pratiwi Desi Kusumawati Devi Indah Anwar Devia Indriani Harfan, Anita Anida Hidayah, Lutfia La Ode Sumarlin Lela Lailatul Khumaisah Lela Laitul Khumaisah Lela Mukmilah Y Lela Mukmilah Yuningsih Muhammad Nurul Fajar Nopriana Yusuf Rahayu, Agustina Reni Mulyani Salih Muharam Sugiarti Rahayu Supendi, Arif Tania Ardisa Turdini, Shopi Yoga Asmara