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Molekul: Jurnal Ilmiah Kimia

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Published by Universitas Jenderal Soedirman

ISSN : 19079761 EISSN : 25030310 DOI : -

Core Subject : Science, Engineering,

Chemical Engineering, Chemistry & Bioengineering Chemistry

MOLEKUL is a peer-reviewed journal of chemistry published by the Department of Chemistry, Faculty of Mathematics and Natural Sciences, Jenderal Soedirman University, Indonesia. Publishing frequency 2 issues per year, on May and November. This Journal encompasses all branches of chemistry and its sub-disciplines including Pharmaceutical, Biological activities of Synthetic Drugs, Environmental Chemistry, Biochemistry, Polymer Chemistry, Petroleum Chemistry, and Agricultural Chemistry.

Arjuna Subject : -

Articles 331 Documents

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Reduction of Graphene Oxide: Controlled Synthesis by Microwave Irradiation Endah Fitriani Rahayu; Bunnari Bunnari; Andri Hardyansyah
Molekul Vol 15, No 1 (2020)
Publisher : Universitas Jenderal Soedirman

Graphene has been attracting enormous attention in the scientific community because of its unique properties and use for various applications. Graphene has been synthesized in various ways, one of which is the graphite oxidation method to form graphene oxide (GO). Reduction of GO to reduced graphene oxide (RGO) is necessary to recover the conjugated network and electrical conductivity, and for this research, this was achieved using microwave irradiation. Microwave synthesis provides an alternative method, saving more time in the reaction process. In this research, graphene was synthesized from graphite by the modified Hummers method and microwave irradiation. This research proves that graphene can be synthesized with a high-quality structure and in a shorter amount of time using microwave irradiation to reduce GO. With longer microwave exposure, less GO is present in the sample, as indicated by the absence of an n–π* electronic transition in the absorbance graph and the absence of oxide groups in the Fourier-Transform Infra-Red spectrum. With increasing microwave power, the reduction process is short-lived, and better quality RGO is produced. This study shows that the new reduction process occurs within 20 minutes with a power of 450 and 630 watts, but at 900 watts, the reduction of GO occurs within 10 minutes, as shown by UV-Vis and FTIR spectra.

Backmatter (Instruction for author and back cover) Amin Fatoni
Molekul Vol 16, No 2 (2021)
Publisher : Universitas Jenderal Soedirman

Backmatter (Instruction for author and back cover)

The Effect of Endosulfan in GnRH and GtH Genes Expression of Male Hard-Lipped Barb (Osteochilus vittatus C.V.) asrul sahri siregar; pudji astuti; yulia sistina; norman arie prayogo
Molekul Vol 15, No 3 (2020)
Publisher : Universitas Jenderal Soedirman

The presence of pollutants in water makes the environment toxic to all living biota and affects reproduction in fish. One of such pollutants is endosulfan, which is an off-patent organochlorine insecticide, widely used in various agricultural activities. Endosulfan is extremely toxic to fish and all other aquatic organisms, showing a range of chronic effects, including genotoxicity, and reproductive issues. Therefore, the aim of the research was to find the effect of endosulfan on cGnRH, sGnRH, GtH-I and GtH-II gene expression inmale hard-lipped barb fish. These fish were kept in aquarium containing several levels of endosulfan (0 mg/L [control]; 0.88 mg/L [low level]; 1.76 mg/L [medium level]; and 2.64 mg/L [high] level) for 60 days. The effects of endosulfan on GnRH performance on the fishwere evaluated by the expressions of these genes; cGnRH-II, sGnRH, GtH-I, and GtH-II. In the 8th week, there was a decrease in the expression of all the four genes in fish with high dose of endosulfan compared with the control group (P < 0.05). These findings showedthat endosulfan inhibits the expression of cGnRH, sGnRH, GtH-I and GtH-II genes in male hard-lipped barb.

Isolation, Characterization and Application of Humin From Sumatran Peat Soils as Adsorbent for Naphtol Blue Black and Indigosol Blue Dyes Maya Rahmayanti; Indah Nurhikmah; Feni Larasati
Molekul Vol 16, No 1 (2021)
Publisher : Universitas Jenderal Soedirman

Isolation, characterization and application of humin as adsorbent for naphtol blue black (NBB) and indigosol blue (IB) dyes has been carried out. Humin application in this study aims to obtain the optimum pH conditions and kinetics model for adsorption NBB and IB dyes onto humin. Humin was isolated from peat soils originating from Riau, Sumatra. The isolation method used was the alkaline extraction method and the characterization of humin using FTIR spectrophotometer. The total acidity, carboxylic groups and –OH phenolic groups of humin were determined quantitatively using the acid-base titration method. FTIR characterization indicated the presence of an –OH group which was indicated by the appearance of absorption at a wavelength of 3425.3 cm-1 and a stretching vibration of C=O from the –COOH group at a wavelength of 1705 cm-1. The quantitative calculation of the total acidity value, the content of the carboxylic group and the -OH group phenolics of humin were 508.47 cmol kg-1, 289.42 cmol kg-1 and 219.05 cmol kg-1, respectively. The optimum pH conditions for adsorption NBB and IB onto humin occurred at pH 5 and pH 2, respectively. The adsorption kinetics model of NBB and IB on humin followed the Ho kinetics model.

Chemical Sensor for Detection of Lead Levels in Herbal Medicine Ani Mulyasuryani; Yuniar Ponco Prananto; Elvian Eka Krisnaniningrum
Molekul Vol 16, No 2 (2021)
Publisher : Universitas Jenderal Soedirman

A new tube type Pb2+ sensor made from two types of mixtures, namely clay-PbI2 and chitosan-PbI2 were prepared. An electromotive force (EMF) with Ag/AgCl as the reference electrode was used as the output signal. The highest performance of the Pb2+ sensor from clay-PbI2 was obtained at Pb2+ solutions in HNO3 and pH 3 with sensor sensitivity of 20.67 mV/decade. The highest performance of the Pb2+ sensor from chitosan-PbI2 was obtained at Pb2+ solutions in demineralized water with sensor sensitivity of 32.49 mV / decade. Application of the two sensors on several commercial herbal samples resulted in an average recovery of 85.62% and 94.10% for sensor from chitosan-PbI2 and clay-PbI2, respectively

Backmatter (Instruction for author and back cover) Amin Fatoni
Molekul Vol 15, No 2 (2020)
Publisher : Universitas Jenderal Soedirman

Backmatter (Instruction for author and back cover) of the print version

Purification of Carbon-Based Magnetic Nanoparticles (CMNs) Produced by Submerged Arc Discharge in Liquid Ethanol/Ethylenediamine Oktaviana Dyah Mayasari; Dielsa Eka Kuswari; Witri Wahyu Lestari; Teguh Endah Saraswati
Molekul Vol 16, No 1 (2021)
Publisher : Universitas Jenderal Soedirman

Surface modification of covalently amine-attached carbon-based magnetic nanoparticles (CMNs) can be produced quite simply in submerged arc discharge using the amine-containing liquid medium ethylenediamine (ED), resulting in CMNs-ED. However, after the arc discharge processing, the resulting nanoparticles possibly contain physically absorbed amine-containing molecules from a liquid medium on the particle surface. To remove the non-covalently bound molecules, a purification process is required. In this study, the purification was conducted using polar and non-polar solvents following the synthesis process. The surface property was initially characterized by a dispersion test in water, showing that CMNs-ED purified by water have better dispersion than CMNs produced in ethanol alone, CMNs-ED before purification, and CMNs-ED after purification by immersion in toluene. Before and after purification, the diffraction pattern showed definitive peaks corresponded to the crystal planes of C(002), Fe3C(220), and Fe3O4(311) at 26.51°, 44.65°, and 35.42°, respectively. The amine functional group on the nanoparticles before purification thought to come from decomposed ethylenediamine assigned by the vibration peaks appeared at a wavenumbers ~3400 cm-1 and 1020-1220 cm-1, which corresponds to N-H and C-N, respectively. After purification, the vibration peaks of amine groups were still observable, indicating that the amine groups were still covalently attached to the nanoparticles. Magnetic analysis showed that CMNs before and after purification have superparamagnetic properties, with the magnetic saturation value around 10-17 emu/g. The electron microscope images show that the CMNs-ED before purification have a spherical form with a diameter larger than CMNs-ED after purification.

Antioxidant Activity and Total Phenol Extract of Kecombrang Flower, Stem and Leaves with Different Types of Solutions Siti Nuryanti; Nurul Latifasari; Rifda Naufalin; Rumpoko Wicaksono; Erminawati Erminawati
Molekul Vol 16, No 2 (2021)
Publisher : Universitas Jenderal Soedirman

Kecombrang (Etlingera elatior) is one of the spices which is quite widespread in Indonesia and has many uses. Kecombrang extract has the potential as an antioxidant and natural antimicrobial to extend the shelf life of food products. Extraction was carried out by multilevel maceration method with different types of solvents. This study aims to determine the effect of extraction on the bioactive components of flowers, stems and leaves of kecombrang in different types of solvents and determine the antioxidant activity and total phenols of each type of kecombrang plant extract.The results showed that extraction with distilled water produced the highest total phenol, antioxidant activity and yield on kecombrang leaves. The total phenol extracts of n-hexane leaves, leaves of ethyl acetate, and leaves of kecombrang distilled water were 19.116, 10.276, and 45.008 (mg TAE g db -1) respectively. The antioxidant activity value of flowers, stems and leaves of distilled water solvent kecombrang are 69.754, 72.648, and 78.003 (%) respectively. The yield for flowers, stems and leaves with distilled water solvent is 15.9; 16.6 and 32.95 (%) respectively.

Anti-toxicity test of Peperomia pellucida steeping on liver function in diabetic-induced rat Saryono Saryono; Hernayanti Hernayanti; Atikah Proverawati
Molekul Vol 15, No 2 (2020)
Publisher : Universitas Jenderal Soedirman

Liver is important for both defense mechanism and protein synthesis in the human body. This study examined the anti-toxicity of Peperomia pellucida on liver function of diabetic-induced rats. It was an experimental study using pre- and post-test control group design. Rats were categorized into five groups, i.e., groups of healthy control (A), negative control (B), and treatment (C-E) with dosages of 150, 300, and 600 mg/kg of P. pellucida, respectively. Each group comprises of 5 rats. The TNF-a, IL-12, and GSH were measured before and after a 14 days administration of P. pellucida. The data were analyzed by using one-way ANOVA test followed by Duncan's post hoc test with a significance level of 5%. The result showed that P. pellucida steeping can improve liver cell damage, which was shown from the parameters of liver function, inflammation, and antioxidants. The mean of TNF-a and IL-12 levels decreased while the total protein, albumin, and GSH levels increased significantly after administration of P. pellucida steeping. Our study concluded that P. pellucida steeping might reduce TNF-a and IL-12 levels, and increased GSH level in diabetic-induced rat. A 300 mg/kg was the most effective dosage to reduce IL-12 and increase GSH.

Investigation of Synthesis of Sodium Aminodiborane in One Step and Its Reaction Kinetics Meryem Sena Akkus; Goksel Ozkan
Molekul Vol 15, No 3 (2020)
Publisher : Universitas Jenderal Soedirman

In this study, sodium aminodiborane (NaNH2(BH3)2) synthesis was carried out in a constant volume batch reactor with a single feed at various temperatures and inlet molar ratios. It was synthesized, ammonia borane and sodium hydride as precursors, by a wet chemical reaction method using tetrahydrofuran which is a solvent under atmospheric pressure. These experiments were carried out at varied temperature ranges from 0 °C to 24 °C, and varied inlet molar ratios (AB/NaH) from 0.75 to 1.25. Sodium amidoborane is synthesized when the experiment is carried out in a stoichiometric ratio, but sodium aminodiborane is synthesized when the mole of ammonia borane is higher than the mole of sodium hydride. In order to characterize the products, FTIR, XRD, GC-MS/MS, and quantitative analysis techniques were utilized. In addition, sodium aminodiborane’s synthesis reaction kinetic was determined. r apparent = 0.8594 e ^ (- 4366 / RT) C AB ^ (0.8) C NaH ^ (0.2). The apparent activation energy, Ea, and frequency constant, k0, were calculated about 4366 J/mol and 0.8594 h-1, respectively

Page 24 of 34 | Total Record : 331

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Home Page

OAI Link

Editorial Team

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Contact Name Amin Fatoni

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Journal Mail Official j.molekul@gmail.com

Editorial Address Jl. Dr. Soeparno No.61 Karangwangkal, Purwokerto, Jawa Tengah 53

Location Kab. banyumas, Jawa tengah INDONESIA

Abstract

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Abstract

Contact Name
Amin Fatoni

Contact Email
aminfatoni@unsoed.ac.id

Phone
-

Journal Mail Official
j.molekul@gmail.com

Editorial Address
Jl. Dr. Soeparno No.61 Karangwangkal, Purwokerto, Jawa Tengah 53

Location
Kab. banyumas,

Jawa tengah

INDONESIA