ALCHEMY Jurnal Penelitian Kimia
ALCHEMY Jurnal Penelitian Kimia is a chemistry journal published by Sebelas Maret University, Surakarta. ALCHEMY Jurnal Penelitian Kimia publishes original research articles or review articles in organic chemistry, inorganic chemistry, analytical chemistry, physical chemistry, biochemistry, and environmental chemistry.
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<![CDATA[Isolation and Identification of Ananixanthone from Ethyl Acetate Extract of Root Bark Of Slatri (Calophyllum Soulattri) (Clusiaceae)) ]]>
<![CDATA[Dindha Ramah Mulia]]>;
<![CDATA[Nestri Wulandari]]>;
<![CDATA[Muhammad Widyo Wartono]]>
<![CDATA[ ALCHEMY Jurnal Penelitian Kimia Vol 10, No 2 (2014): September ]]>
Publisher : <![CDATA[UNIVERSITAS SEBELAS MARET (UNS) ]]>
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DOI: 10.20961/alchemy.10.2.56.130-136
<![CDATA[A xanthone, named ananixanthone (1) has been isolated and identified from the ethyl acetate extract of the root barks of Calophyllum soulattri. Structure of the compound was determined based on spectroscopic data, including UV, IR, NMR 1D, NMR 2D and by comparison with references.]]>
<![CDATA[Use of Battery Carbon as Electrodes in Arc Discharge Method for Fabrication of Carbon-Modified TiO2. ]]>
<![CDATA[Isya Fitria Andhika]]>;
<![CDATA[Carissa Hertiningtyas]]>;
<![CDATA[Ardian Aji]]>;
<![CDATA[Alifia Desy]]>;
<![CDATA[Teguh Endah Saraswati]]>;
<![CDATA[Patiha Patiha]]>
<![CDATA[ ALCHEMY Jurnal Penelitian Kimia Vol 10, No 2 (2014): September ]]>
Publisher : <![CDATA[UNIVERSITAS SEBELAS MARET (UNS) ]]>
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DOI: 10.20961/alchemy.10.2.542.186-194
<![CDATA[Fabrication with carbon-modified TiO2 by arc discharge method in liquid medium has been studied. This research was performed in two steps including fabrication and characterization. This fabrication was done by arcdischarge method with graphite electrodes from dry cell batteries and liquid medium suspension of TiO2 in ethanol 30, 50 and 70 %. A strong current was applied to electrode as 10 -50 A (20-40 V). Nanocomposites formed on the liquid medium surface were collected and characterized using X-ray diffraction (XRD),scanning electron microscope (SEM) dan energy dispersive spectroscopy (EDS) to determine crystallinity, surface morphology and the constituent elements, respectively. XRD data shows that the most effective fabrication TiO2/Karbon by liquid medium in ethanol 50 % indicated from the formation of a new peak with high intensity of TiC on 2Ɵ= 36.02 °. SEM data shows that the morphology of each aggregated TiO2/Karbon compared to the morphology of TiO2. In addition, EDS data shows the presence of the element carbon, titanium and oxygen in the same area indicating that the successful formation of composite material between TiO2 dan carbon.]]>
<![CDATA[Biodiesel Synthesis of Cotton Seeds Oil (Ceibapentandra) By Chemically Transesterification Process and Ion Fragmentation of Methyl Ester ]]>
<![CDATA[Erin Ryantin Gunawan]]>;
<![CDATA[Siska Ayu Wulandari]]>;
<![CDATA[Emmy Yuanita]]>;
<![CDATA[Dedy Suhendra]]>
<![CDATA[ ALCHEMY Jurnal Penelitian Kimia Vol 10, No 2 (2014): September ]]>
Publisher : <![CDATA[UNIVERSITAS SEBELAS MARET (UNS) ]]>
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DOI: 10.20961/alchemy.10.2.528.104-115
<![CDATA[Fossil fuel is commercial energy sources in many communities where their abundance progressively reduced and the resulting environmental pollution. Biodiesel is one alternative fuel made from vegetable which oils are suitable to replace the function of fossil fuels and environmentally friendly. Synthesis of biodiesel from cotton seeds oil was carried out by chemically ransesterification process. Composition of methyl esters in biodiesel thatwas analyzed by GC-MS are methyl palmitate (16.71%), methyl 8,11-octadecadienoic (46.45 %) and methyl linoleate (4.21 %).The highest amount of biodiesel conversion isat ratio of oil and methanol (1:1) with the catalyst 1% (weight of oil). The produced biodiesel was 93.7 %. Chemical properties of the produced biodiesel meets the standard SNI 04-7182-2006 i.e. saponification value of 120.167 mg KOH / g, acid value of 0.28 mg KOH / g and iod value 55.84g iod/100g of sample.]]>
<![CDATA[Effectiveness of Gelatin Extracted from Chicken Claws as A Natural Preservatives for Beef and Fish ]]>
<![CDATA[Ganjar Fadilah]]>;
<![CDATA[Pramudita Putri Kusuma]]>;
<![CDATA[Teguh Endah Saraswati]]>
<![CDATA[ ALCHEMY Jurnal Penelitian Kimia Vol 10, No 2 (2014): September ]]>
Publisher : <![CDATA[UNIVERSITAS SEBELAS MARET (UNS) ]]>
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DOI: 10.20961/alchemy.10.2.544.195-206
<![CDATA[Gelatin has been successfully extracted from chicken clawsby acid hydrolysis method through four major stages of degreasing, demineralization, extraction and drying. The yield of extracted gelatin obtained from wet chicken claws was about 6.21 % (w/w). The effectiveness of gelatin as preservative applied in beef and fish was physically, chemically and microbiologically studied by organoleptic analysis, peroxide test, bacteria inhibition test and number calculation, respectively. Organoleptic analysis by hedonic test shows there were significant differences for color and texture parameters between gelatin coated samples and control samples at concentrations of 1:1 (w/w). Peroxide number analysis by iodometry indicates the use of gelatin in the preservation of meat and fish decreased the oxidation number. The result of inhibition test againts Staphylococcus aureus bacteria shows the gelatin concentration of 20 % provided greatest halo zone diameter (inhibitory region) as 19.44 ± 2.11 mm. The colony bacteria test shows the use of gelatin potentially inhibited the growth of bacteria up to 75 %. Overall, the results conclude that gelatin extracted from chicken claws has the potential activities as a natural preservative for beef and fish.]]>
<![CDATA[Synthesis And Characterization Of Complex Diaquadihydantoin Nickel(II) Sulfat Monohidrat ]]>
<![CDATA[Sentot Budi Rahardjo]]>;
<![CDATA[Surya Dewi Marliyana]]>;
<![CDATA[Nur Asih Siwi Wulandari]]>
<![CDATA[ ALCHEMY Jurnal Penelitian Kimia Vol 10, No 2 (2014): September ]]>
Publisher : <![CDATA[UNIVERSITAS SEBELAS MARET (UNS) ]]>
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DOI: 10.20961/alchemy.10.2.534.137-148
<![CDATA[The purpose of the research is to find out the synthesis, formula and characteristic of complex of Nickel(II) with hydantoin (hyd). Complex of nickel(II) with hydantoin have been synthesized in 1 : 1 mole ratio of metal to ligan in methanol.The formula of complex which are predicted from analysis of % Ni in complex by Atomic Absorption Spectroscopy (AAS) is Ni(hyd)2(H2O)3.SO4. Ratio of cation and anion of complex is measured by conductivitymeter correspond to 1: 1. The thermal analysis is determined by Differential Thermal Analyser (DTA) indicate that complex contain some hydrate, thus possibility formula of complex is [Ni(hyd)2(H2O)2]SO4.H2O (Diaquadihydantoinnikel(II) sulfat monohidrat). Data of infra red spectra show a shift of N-H group and tertier N group 138 absorption and indicate this functional group coordinated to the center ion. Magnetic Suscepbility measurement show that the complex is paramagnetic with μeff = 3.2 BM. The UV-Vis spectra appear do to 2 transition peak on λ = 740 nm (13,513 cm-1) and 405 nm (24,691 cm-1). The peak indicate that structure of complex is octahedral with transition 3A2g→ 3T1g(P)(ν2) andtransition 3A2g → 3T1g(F)(ν3). One peak which is not appear is transition 3A2g → 3T2g (F)(ν1) which also estimate of 10 Dq (Δ0) is 103.615 kJ mol-1.]]>
<![CDATA[The Effect of Sol-Gel Temperature and Solvent Polyethylene Glycol (PEG) in ZnO-TiO2 Photocatalyst Act as Degrader of Textile Dyeing Liquid Waste ]]>
<![CDATA[Tanti Haryati]]>;
<![CDATA[Novita Andarini]]>;
<![CDATA[Siti Mardhiyah]]>
<![CDATA[ ALCHEMY Jurnal Penelitian Kimia Vol 10, No 2 (2014): September ]]>
Publisher : <![CDATA[UNIVERSITAS SEBELAS MARET (UNS) ]]>
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DOI: 10.20961/alchemy.10.2.536.149-156
<![CDATA[The use of TiO2 powder as photocatalyst still provides some disadvantages such as the difficulties in regenerate ion, the low adsorption and turbulence . These problems can be overcomed by providing the photocatalyst as a composite of ZnO-TiO2. This research aims to investigate the effect of composition of solvent and temperatureof synthesis on the quality and photocatalytic activity of ZnO-TiO2 which was prepared by sol-gel method. The photocatalytic activity was determined by applying the composite in degradation of Procion Red MX-8B under irradition of UV light for 24 hours. The procion red concentration after degradation was determined by UV-Vis spectrophotometer. Meanwhile the effect of synt hesis temperature on crystal structure of composite was studied by XRD. The results show that the composite which was prepared by PEG 1500 at 1:4 of moles ratio and at 70 °C of synthesis temperature has highest degradation percentage, i.e. 55.375 % and photocataltic activity of 3.561 x 10-7mg/cm2s.]]>
<![CDATA[Reverse Microemulsion of Igepal CO-720 System as Microreactor For CdS Synthesis ]]>
<![CDATA[Fitria Rahmawati]]>;
<![CDATA[Indah Rizki Fitriani]]>;
<![CDATA[Abu Masykur]]>
<![CDATA[ ALCHEMY Jurnal Penelitian Kimia Vol 10, No 2 (2014): September ]]>
Publisher : <![CDATA[UNIVERSITAS SEBELAS MARET (UNS) ]]>
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DOI: 10.20961/alchemy.10.2.538.157-172
<![CDATA[A Research on CdS synthesis in reverse microemulsion of Igepal CO-720 system has been conducted at various weight ratio of water to surfactant. Igepal CO-720 naturally forms oil in water (o/w) emulsion type due to its high HLB (Hydrophilic -Lipophilic Balance) value. Therefore, in this research the Igepal CO-720 system was inversed into water in oil (w/o) system before it was used as microreactor for CdS synthesis. As comparison, a system of AOT (Aerosol OT; sodium bis (2-ethylhexyl) sulfosuccinate) which is naturally w/o system was also used as microreactor for CdS synthesis. The prepared CdS was analyzed by X-ray diffraction for crystal identification, scanning electron microscope for morphological analysis, UV-Vis for absorption edge determination and photoelectrochemical testing for photoactivity. The results show that the Igepal CO -720 system can be inverted into w/o system and can be used as microreactor for CdS synthesis. The prepared CdS is in nanosize with the average diameter of 2.517 ± 0.014 nm and the average gap energy of 3.805 ± 0.178 eV. The prepared CdS in Igepal CO-720 system has less regular form in comparison with morphology of the prepared CdS in AOT system. As the ω values decreases the particle diameter decreases, the gap energy increases and the % IPCE increases. It indicates that high surfactant concentration allows small size micelles formation and produced smaller CdS particle that has high surface area and therefore provide higher photocatalytic activity which was indicated by high value of its % IPCE.]]>
<![CDATA[Composite of Chitosan Vanilin / Sulfonated Polystyrene As Polymer Electrolyte Membranes: Cationic Exchange Capacity, Swelling Degree And Thermal Properties ]]>
<![CDATA[Edi Pramono]]>;
<![CDATA[Candra Purnawan]]>;
<![CDATA[Yuniawan Hidayat]]>;
<![CDATA[Jati Wulansari]]>;
<![CDATA[Sayekti Wahyuningsih]]>
<![CDATA[ ALCHEMY Jurnal Penelitian Kimia Vol 10, No 2 (2014): September ]]>
Publisher : <![CDATA[UNIVERSITAS SEBELAS MARET (UNS) ]]>
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DOI: 10.20961/alchemy.10.2.55.116-129
<![CDATA[Research on the preparation and characterization of sulfonated polystyrene (PST) /chitosan vanillin (KV) composite as electrolyte membranes has been conducted in order to investigate the effect of PST and KV composition to its chemical and physical properties. Polystyrene was modified by sulfonation reaction to produces PST, meanwhile chitosan was modified by schift base reaction to produces KV. The composite membranes were prepared by casting method and were characterized in order to identify the functional groups contained in the composite, the cation exchange capacity (CEC), the Swelling Degree (SD), the thermal properties and the morphology. The peak of imine vibration in the FTIR spectrum indicates that the chitosan vanilin was succesfully synthesized. Meanwhile, the peak of sulfonate vibration indicates the product of sulfonation on polystyrene. The result of CEC analysis shows that the addition of sulfonate groups on polystyrene and the addition of phenolic groups on chitosan increase the CEC value. The increasing of PST and KV concentration in membrane enhance the CEC value. However, the increasing of PST concentration in membrane composition even decrease the Swelling Degree of membranes. Meanwhile, the increasing of KV concentration increase the swelling degree of membranes. Thermal analysis shows that the thermal decomposition of membranes occurs in three stages i.e. the dehydration of water molecules, the degradation of the subtituen groups and the plasticizer and the degradation of the back bone of chitosan and polystyrene.]]>
<![CDATA[Lift Off Process on Fabrication of Carbon Monoxide (CO) Gas Sensor Devices ]]>
<![CDATA[Slamet Widodo]]>;
<![CDATA[Goib Wiranto]]>
<![CDATA[ ALCHEMY Jurnal Penelitian Kimia Vol 10, No 2 (2014): September ]]>
Publisher : <![CDATA[UNIVERSITAS SEBELAS MARET (UNS) ]]>
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DOI: 10.20961/alchemy.10.2.540.173-185
<![CDATA[This paper discuss the design and fabrication of microdevice to be used as platform for CO (Carbon monoxide) gas sensor based on tin dioxide (SnO2). The device has been designed on silicon substrate with an active area of 3x3 mm2, and it is consist of bonding pad, heater, electrode, and temperature sensor components. The minimum feature size used is 50 microns, as allowed by the capability of photolithographic process. The formation of microdevice structure was carried out by lift-off technique on platinum (Pt) layer, which was deposited by DC sputtering with aluminum (Al) as sacrificial layer. The overall chip dimension is 5x5 mm2. The measurement that was conducted to study the characteristic of resistance asfunction of temperature has shown that the heater and temperature sensor elements could work as expected, in which their resistances change linearly as the temperature of the substrate increase by 20–200 °C. The resistance values of the heater increase 500–1000 ohm. Meanwhile, the resistance increasing for temperatur sensor is between 100–300 ohm. ]]>
