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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 10 Documents

Search results for , issue "Vol 13, No 2 (2018)" : 10 Documents clear

3-Mercaptopropionic Acid as Corrosion Inhibitor for Carbon Steel in CO2 Aerated 1% NaCl Solution with Buffer Control-pH Yayan Sunarya
Molekul Vol 13, No 2 (2018)
Publisher : Universitas Jenderal Soedirman

In this research, 3-Mercaptopropionic acid (MPA) as corrosion inhibitor of carbon steel in CO2 aerated 1% NaCl solution with buffer pH adjustment has been studied by means of electrochemical impedance (EIS) and polarization (Tafel plot). MPA was found to be an effective carbon steel inhibitor. Percentage inhibition efficiency (IE %) calculated by both Tafel plot and EIS, ranged from 85% to 90%. MPA was found to affect the cathodic processes and act as cathodic-type inhibitors. Mechanism of inhibit corrosion by adsorption mechanism leads to the formation of a protective chemisorbed film on the metal surface film which suppresses the dissolution reaction and the hydrogen evolution reaction is activation controlled.

Proximate Compositions and Biological Activities of Caulerpa lentillifera Risa Nofiani; Sigit Hertanto; Titin Anita Zaharah; Sutarman Gafur
Molekul Vol 13, No 2 (2018)
Publisher : Universitas Jenderal Soedirman

Caulerpa lentillifera is an edible and functional seaweed due to its high nutritional compositions and its biological activities. In this study, C. lentillifera was evaluated for its proximate compositions (moisture, ash, protein, lipid and fiber contents) and its biological activities (antimicrobial, anti-oxidant, and toxicity). Moisture content, crude lipid, crude protein, and crude fiber were determined using oven method, soxhlet extraction, semi-micro Kjeldhal, and hydrolysis, respectively. Fresh C. lentillifera of Natuna Island, Indonesia, showed its higher level content of ash, crude lipid, and crude fiber compared to that of fresh C. lentillifera of Penghu, Taiwan. For its biological activity assays, the extracts were prepared from fresh and dry C. lentillifera (FC and DC). Both of the extracts showed the broad spectrum of weak antimicrobial using well-diffusion agar tests and antioxidant activities using a modified linoleic acid emulsion system. The toxicity for both extracts was determined using brine shrimp lethality test. DC extract showed its very low toxicity level and there was no toxicity for FC. Hemolytic activity was determined using red blood assay. Both extracts showed their low hemolytic activities (about 5-13%) for the concentration of 100 and 150 μg/mL, but the activity increased sharply (about 96%) on the concentration of 200 μg/mL. It was concluded that C. lentillifera has a potency as a functional food due to containing secondary metabolites with various biological activities.

Pyrolysis Process of Mixed Polypropylene (PP) and High-Density Polyethylene (HDPE) Waste with Natural Zeolite as Catalyst Emi Erawati; Hamid Hamid; Annisa Ayu Ilma
Molekul Vol 13, No 2 (2018)
Publisher : Universitas Jenderal Soedirman

The reactor of the experiment was made from stainless steel with the diameter of 25 cm and the height of 30 cm. The liquid petroleum gas was used as a fuel in the reactor. The reactor was connected by the thermocouple that controls temperature variations at 410, 420, 430, and 450ºC. Raw material contained plastic bottles and waste caps, while the natural zeolite as a catalyst was dried and cut in dimensions of 3x3 cm. A gas as the reacted product was condensed using the first condenser, then the liquid product was collected. Uncondensed gaswas condensed again in the second condenser, then the liquid product was collected again. The volume of gas was calculated based on the water volume coming out of the gallon. Thiswas repeated with varied ratios of plastics to natural zeolite (67:33; 75:25; 80:20; and 83:17 wt%). Pyrolysis was run for two hours and every 20 minutes the sample was weighed to gauge the change inmass of gas and liquid. After 120 minutes, the solid sample was examined to identify the mass of final solid. Based on the research, at the temperature of 440ºC, the highest liquid yield was 68.42%. On the other hand, with the ratio of raw material to zeolite at 83:17 wt%, the largest yield of liquid was 87.31%. The liquid product in various temperature and comparisons of percentage of raw material to catalyst was found to meet diesel specifications based on The Decree of Director General of Fuels and Gas Year 200,8 Number 14,496 K/14/DJM/2,008.

Fabrication and Performance of Laterite East Kotawaringin-Zeolite/Chitosan Composite as Slow Release of Iron Fertilizer Rendy Muhamad Iqbal; Sri Wardhani; Darjito Darjito; Karelius Karelius
Molekul Vol 13, No 2 (2018)
Publisher : Universitas Jenderal Soedirman

Laterite soil is one of natural resources in East Kotawaringin regency, Central Kalimantan, Indonesia, which contains high element of Fe. Fe is one of micronutrients that is needed for plant in slight amount. This study aims to determine the effect of chitosan composition and composition of zeolite : laterite on the release of Fe activities from synthesized fertilizers result. Laterite is characterized by using XRF and XRD. Slow release iron fertilizer is synthesized by eliciting laterite to zeolite matrix. Then, It is stirred into chitosan gel with concentration of 2, 2.6, and 2.8 % for 30 minutes. After Zeolite - laterite - chitosan has been homogenized, then it is dropped into 0.4 M NaOH to form beads. Then testing the release of Fe with the batch method in distilled water. The result showed that the laterite soil is amorphous form, and Fe content reached 80.25 % . The higher the concentration of chitosan which is used , then more Fe is released from fertilizer. Whereas if the amount of zeolite is greater, the slower the release of Fe will be.

Separation Of Radioisotope 113mIn Using Column Chromatography Based on Silica Gel Matrix Duyeh Setiawan; M Basit Febrian; Yanuar Setiadi
Molekul Vol 13, No 2 (2018)
Publisher : Universitas Jenderal Soedirman

Radioisotope indium-113m (113mIn) with half-life, T1/2 = 1.7 hours and gamma energy, Eg = 391 keV is suitable and meets the criteria as radiotracer in industry. 113mIn radioisotope was obtained from tin-113 decay (113Sn, T1 / 2 = 115 days) of 112Sn (n,g) 113Sn neutron activation in nuclear reactor. The process of separation of radioisotope 113mIn using column chromatography method based on silica gel matrix using 0.05 M HCI solution. Radionuclide and radiochemical purity tests were performed using the gamma-spectrometry method and paper chromatography. The final product specification in the form of 113mInCl3 is clear solution, pH 2, obtained yield of 81.83%, radionuclide purity of 90.22%, radiochemical purity of 91.61 ± 0,29% and stable for 3 days at room temperature.

The Study of Artemisinin Content in Callus Artemisia annua L. Cultures Elicited with Endophytic Fungi Aspergillus sp. Farida Yuliani; Widyatmani Sih Dewi; Ahmad Yunus; Usman Siswanto
Molekul Vol 13, No 2 (2018)
Publisher : Universitas Jenderal Soedirman

Artemisinin, is a sesquiterpene lactone which is originally extracted from the medicinal plant Artemisia annua L. Artemisinin is a very effective antimalarial agent, however it is produced in very low amounts in plants. Chemical synthesis of artemisinin is complicated and not economically feasible. Researchers often use elicitation methods to increase artemisinin content in a laboratory scale with biotic or abiotic elicitor. This study examined the effect of elicitation using endophytic fungi Aspergillus sp on artemisinin content of callus A. annua cultures. Observations were made on its growth, texture and color, chlorophyll content and dry weight. Fungi were isolated from the stem tissue of A. annua and callus were grown on Murashige and Skoog medium. After 3 weeks of incubation, callus treated with four different elicitors concentration (0, 2, 4, 6 mg/mL). There were significant alterations on callus culture in terms of growth, texture, color and chlorophyll content after elicitation. The results clearly demonstrated that the endophytic fungal elicitor Aspergillus sp could increase artemisinin content but did not affect the callus dry weight of A. annua. The treatment of 4 mg/mL elicitor produced the highest artemisinin content, that increased 7.6 times compared to the control, from 0.0036% to 0.0275%.

Thermodynamic Properties of Water Adsorption on Gaplek Flour Fortified with Red Bead Tree Seed Margareta Novian Cahyanti; Alvama Pattiserlihun
Molekul Vol 13, No 2 (2018)
Publisher : Universitas Jenderal Soedirman

The moisture sorption isotherm data of gaplek flour fortified with red bead tree seed stored in a chamber, the relative humidity of chamber ranging from 10% to 97% regulated using a saturated salt solution, was determined at three temperatures 25°, 35°, and 45 °C. The experimental data used to determine the thermodynamic functions were isosteric heat of sorption, sorption entropy, and free energy changes. The sorption isosteric heats were determined by the application of the Clausius–Clapeyron equation. Isosteric heats of adsorption increased to maximum level and then declined with increase of moisture content. Adsorption entropy increased to maximum level and then declined with the increase of moisture content. The free energy changes increased with increase in moisture content. The spreading pressure increased with increasing water activity.

Liquid Soap from Nyamplung Seed Oil (Calophyllum inophyllum L) with Ketapang (Terminalia catappa L) as Antioxidant and Cardamom (Amomum compactum) as Fragrance Senny Widyaningsih; Mochammad Chasani; Hartiwi Diastuti; Wawan Nur Fredyono
Molekul Vol 13, No 2 (2018)
Publisher : Universitas Jenderal Soedirman

The non-edible oil from nyamplung seed (Callophyllum inophylum L.) has been widely used as a soap ingredient. The soap production from nyamplung seed oil with the addition of antioxidant and fragrance had been carried out in this research. Ketapang (Terminalia catappa L) fruit extract and Cardamom (Amomum compactum) were used as antioxidant and fragrance substances, respectively. The variation of concentration of antioxidant and fragrance has been carried out to obtain the high quality of soap. Characterization was done to know the quality of soap in accordance with SNI 06-4085-1996. The antioxidant activity was analyzed using DPPH (1,1-diphenyl-2-picrylhydrazyl). The results showed that the addition of 1% ketapang fruit extract and 3% cardamom fragrance exhibited the best characteristics. The antioxidant activity test showed that the IC50 value of the best antioxidant soap is 79.51 ppm, indicating that the soap is a strong category

The Synthesis of MnFe2O4-Activated Carbon Composite for Removal of Methyl Red From Aqueous Solution Fahma Riyanti; Poedji Loekitowati Hariani; Widia Purwaningrum; Elfita Elfita; Shella Santika Damarril; Iqlima Amelia
Molekul Vol 13, No 2 (2018)
Publisher : Universitas Jenderal Soedirman

In this study, MnFe2O4-activated carbon composite was synthesized by co-precipitation method and applied to adsorb methyl red dye. MnFe2O4-activated carbon composite was made with the mass ratio of activated carbon and MnFe2O4 of 1:2. The composite characterization by using X-Ray Diffraction, Fourier Transform Infrared Spectroscopy, Scanning Electron Micrograph, and Energy-Dispersive X-Ray Spectroscopy, the surface area using the Brunauer, Emmett and Teller and magnetic properties by using Vibrating Sample Magnetometer. The adsorption parameters include contact time, and adsorbent weight. The spectra of FTIR MnFe2O4-activated carbon composite analysis show the presence of Fe-O and Mn-O which is not present in the spectra of activated carbon. SEM analysis shows that the composite has pores and MnFe2O4 oxides are spread on its surface. The composition of the composite consists of C, O, Fe, and Mn. The composite has a surface area of 143.992 smaller than that of the activated carbon of 217.697 m2/g. However, the composite has magnetic properties with the saturatization magnetization of 17.91 emu/g. The optimum condition of the composite for adsorption of methyl red was obtained at a weight of 0.15 g, and contact time of 100 minutes. The adsorption of the composite was in accordance by pseudo-second-order kinetic and Langmuir isotherms with adsorption capacity of 81.97 mg/g.

Validation Method of Flame-AAS with Microwave Digestion for Mineral Analysis in Carbohydrate-Rich Samples Imas Solihat; Didah Nur Faridah; Nancy Dewi Yuliana
Molekul Vol 13, No 2 (2018)
Publisher : Universitas Jenderal Soedirman

One of the effective methods for mineral destruction is by using microwave digestion. However, some parameters in the microwave manual book are different with AOAC method such as the volume of acid, temperature, and the length of destruction time (Δt). Thus, a validation for mineral analysis method of Fe, Zn, and Cu by using microwave digestion method is required. In this study, carbohydrate-rich samples such as rice and canned pineapple were being used for the validation of mineral analysis method of Fe, Zn, and Cu using microwave digestion. The parameters of this research include LOD, LOQ, LDM, linearity, precision, accuracy, and reproducibility. The accuracy result for Fe, Zn, and Cu mineral was found in the range of 75-120% with good precision value (% RSD <% 2/3RSD Horwitz). Based on the results, accuracy for mineral Fe, Zn and Cu found in the range of 75-120% with good precision value (% RSD <% 2/3RSD Horwitz). The regression curves of the Fe, Zn, and Cu minerals gave the value of R2> 0.990. For LDM values in the rice samples consecutively for Fe, Zn, and Cu minerals were 0,06; 0,07; 0,04 mg/L, while for the canned pineapple were 0,07;0,10;0,01 mg/L, respectively. The results of a modified method for minerals Fe, Zn and Cu analysis in carbohydrate-rich samples was not significantly different from AOAC (2012). Thus the method was acceptable to be used in laboratory analysis.

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Amin Fatoni

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

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Jawa tengah

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Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

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

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

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