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All Journal Jurnal Ilmu Pertanian Indonesia VALENSI Chimica et Natura Acta Santika : Jurnal Ilmiah Sains dan Teknologi Jurnal Kimia dan Kemasan
Dikdik Mulyadi
Universitas Muhammadiyah Sukabumi
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Environmental Science Materials Science & Nanotechnology

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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.
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.
Co-Authors . Suryatna A Jaka Kurnia Aji Achmad Saputra Devia Indriani La Ode Sumarlin Lela Lailatul Khumaisah Lela Mukmilah Yuningsih Nopriana Yusuf Reni Mulyani Salih Muharam Tania Ardisa Yoga Asmara