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[Study Pore Characterization of γ-Alumina – Activated Carbon Composite Made of Cassava Peels (Manihot esculenta Cranz) ]]>
<![CDATA[Hartini Hartini]]>;
<![CDATA[Yuniawan Hidayat]]>;
<![CDATA[Mudjijono Mudjijono]]>
<![CDATA[ ALCHEMY Jurnal Penelitian Kimia Vol 11, No 1 (2015): March ]]>
Publisher : <![CDATA[UNIVERSITAS SEBELAS MARET (UNS) ]]>
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DOI: 10.20961/alchemy.11.1.106.47-57
<![CDATA[A composite of γ-alumina and activated carbon made of cassava peels was studied in terms of its pore structures and its properties. The objective of this study was to determine the interaction and structure, as well as the character and pore size of γ-alumina – activated carbon composite.Carbon made of cassava peels was activated by H2SO4 and its activities were tested according to the Indonesian Industrial Standards (SII). The addition of activated carbon into γ-alumina made in variations of 10, 20, 30, 40 and 50 % w/w, of the total weight of 10 grams. The composite of γ-alumina - activated carbon was characterized by FTIR, SAA (Surface Area Analyzer), XRD, and determination of Hysteresis Loop composites.The greater addition of activated carbon to γ-alumina causes intermolecular interactions between –O-H groups form rehydrated hydrogen bonds in the composite is greater. The structure of γ-alumina in the composites remain intact although the percentage of activated carbon in composite is large. The total pore volume and surface area using the BET method of the composite decreases with increasing activated carbon percentage. The greater addition of activated carbon to γ-alumina causes size of mesoporous composites decreased with the characteristic of a composite formed is closer to the activated carbon.]]>
<![CDATA[Study of Conformational Preferences of Erythro-Carolignan E Assessed By The Coupling Between H7'-H8' in Different NMR Solvents ]]>
<![CDATA[Rudiyansyah Rudiyansyah]]>;
<![CDATA[Ajuk Sapar]]>;
<![CDATA[Masriani Masriani]]>
<![CDATA[ ALCHEMY Jurnal Penelitian Kimia Vol 11, No 1 (2015): March ]]>
Publisher : <![CDATA[UNIVERSITAS SEBELAS MARET (UNS) ]]>
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DOI: 10.20961/alchemy.11.1.99.1-7
<![CDATA[Erythro-carolignan E (1) has been obtained from the ethanol extract of the wood bark of Durio affinis Becc. This research was conducted in order to prove that conformational preferences of compound 1 were solvent dependent. On the basis of 1H-NMR data, the relative configuration of compound 1 was characterized by a coupling constant (3JHH) value of 3.3 Hz at H-7' in CDCl3. The coupling constant (3JHH) values of H-7' in compound 1 has changed to 4.1 Hz and 5.3 Hz in pyridine-d5 and acetonitrile-d3 respectively. As a result, the conformation of compound 1 at C7'-C8' has changed in different NMR solvents. In conclusion, structure oferythro-carolignan E that contains a dihydroxy group at C7'-C8' is able to change in different NMR solvent.]]>
<![CDATA[Cytotoxic Compound from Ethyl Acetate Fraction of Brucea javanica (L.) Merr Fruit Against HeLa Cell Line ]]>
<![CDATA[Nurlina Nurlina]]>;
<![CDATA[Ari Widiyantoro]]>
<![CDATA[ ALCHEMY Jurnal Penelitian Kimia Vol 11, No 1 (2015): March ]]>
Publisher : <![CDATA[UNIVERSITAS SEBELAS MARET (UNS) ]]>
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DOI: 10.20961/alchemy.11.1.108.58-71
<![CDATA[The pure compound relatively (85 mg) was isolated from 4.5 kg Brucea javanica (L.) Merr. fruits sample. It was obtained from ethyl acetate fraction as a red-brownish amorphous solid of melting point 202-206 oC. Phytochemical screening of isolate showed positive result of terpenoid group. Based on analysis by UV, IR,1H-NMR and 13C-NMR spectroscopy and by comparison with known related compounds, indicated that isolate is quassinoid compound named Picras 3- en- 21- oat acid, 15-(acetyloxy)-13,20- epoxy-3-(ß-D- glucopyranosyloxy)-11, 12- dihydroxy -2, 16- dioxo -, methyl ester. Cytotoxic test using MTT assay method showed that compound have IC50 9,7 µg/mL.]]>
<![CDATA[Preparation Micro-Filtration Ceramic Membrane from Natural Zeolite for Procion Red MX8B and Methylene Blue Filtration ]]>
<![CDATA[Dyah Choiriyah]]>;
<![CDATA[Esfi Riandini]]>;
<![CDATA[Arinta Wulandari]]>
<![CDATA[ ALCHEMY Jurnal Penelitian Kimia Vol 11, No 1 (2015): March ]]>
Publisher : <![CDATA[UNIVERSITAS SEBELAS MARET (UNS) ]]>
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DOI: 10.20961/alchemy.11.1.100.8-14
<![CDATA[The study of ceramic membrane fabrication from natural zeolite and its utilization for filtration of procion red MX8B and methylene blue has been investigated. The purposes of this study are to determine the effect of pressure on membrane permeability and selectivity and utilize natural zeolite as ceramic membranes procion red MX8B and methylene blue filtration. The membrane was prepared by metide press pellets and then calcined at 850 oC. The membranes were characterized by mechanical test, flux and rejection of dye. The compression test of the membrane found the values of 1369.178 psi in dry conditions to 1388.933 psi in wet conditions. The flux test found that the higher the pressure applied, the flux was increase. However, the high pressure also decreased the selectivity. Rejection test found that the rejection of methylene blue filtration up to 70 %. Meanwhile, procion red MX8B filtration has rejectivity less than 20 %.]]>
<![CDATA[An Empirical Study on The Hydrogen Peroxide Reaction with Iodide in Acid Condition ]]>
<![CDATA[Ayuni Dita Rosalia]]>;
<![CDATA[Patiha Patiha]]>;
<![CDATA[Eddy Heraldy]]>
<![CDATA[ ALCHEMY Jurnal Penelitian Kimia Vol 11, No 1 (2015): March ]]>
Publisher : <![CDATA[UNIVERSITAS SEBELAS MARET (UNS) ]]>
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DOI: 10.20961/alchemy.11.1.109.72-80
<![CDATA[This research aimed to find out I- reaction order in the mechanism of hydrogen peroxide reaction with iodide in acid condition, to find out the form of rate law, and to show the role of H+ in reaction. The experiment for determining reaction order was carried out with isolation method using UV-Vis spectrophotometry. The order reaction was obtained from the r value approaching one, the results of its linear regression. The form of rate law was viewed from the presence or absence of oxygen gas. Meanwhile the role of H+ in reaction was determined by observing the pH value in 60 minutes.The result of experiment shows that the mechanism of reaction has rate law in the form of fraction, in which I- could be in zero and first orders. In addition, the rate law in this experimental condition is not an addition in the absence of O2 and relatively equal kobs value in the same order. The role of H+ is observed not as catalyst, but reactant.]]>
<![CDATA[Characteristics of Chlorella sp Biomass Immobilized on Chitosan (Chlo-Kit) for Adsorption of Chromium(III) Solution ]]>
<![CDATA[Titin Anita Zaharah]]>;
<![CDATA[Anis Shofiyani]]>;
<![CDATA[Endah Sayekti]]>
<![CDATA[ ALCHEMY Jurnal Penelitian Kimia Vol 11, No 1 (2015): March ]]>
Publisher : <![CDATA[UNIVERSITAS SEBELAS MARET (UNS) ]]>
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DOI: 10.20961/alchemy.11.1.102.15-28
<![CDATA[Properties of biosorbent prepared from biomass of Chlorella sp immobilized on chitosan (Chlo-Kit) have been studied for adsorption of Chromium(III). Chlo-Kit adsorbent prepared by following steps: dissolving chitosan to get hydrogel form, immobilization of biomasson chitosan hydrogel, beads formation and crosslinkingthe adsorbent beads using epichlorohydrin reagent.Characterization using FT-IR spectrophotometry and SEM showed that mechanism of biomass immobilization on chitosan involves electrostatic interactions between the functional groups of such both materials. Biomass immobilized on chitosan (Chlo-Kit) showed the higher stability in acid medium than un-immobilized biomass. Adsorption of Cr(III) metal ion on Chlo-Kit occured at optimum pH of 4-5 and followed well the Langmuir adsorption isotherm model. The adsorption capacity of Cr(III) on Chlo-Kit was 68.965 mg/g, about 91% higher than that on Chlorella biomass]]>
<![CDATA[Reduction on The Levels of Tannins from Stevia Rebaudiana Extract Using Activated Carbon ]]>
<![CDATA[Triana Kusumaningsih]]>;
<![CDATA[Nur Jannah Asrilya]]>;
<![CDATA[Suci Wulandari]]>;
<![CDATA[Dewi Restu Tri Wardani]]>;
<![CDATA[Khoirul Fatihin]]>
<![CDATA[ ALCHEMY Jurnal Penelitian Kimia Vol 11, No 1 (2015): March ]]>
Publisher : <![CDATA[UNIVERSITAS SEBELAS MARET (UNS) ]]>
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DOI: 10.20961/alchemy.11.1.111.81-89
<![CDATA[Extraction of tannins from leaves of Stevia rebaudiana using ethanol 30% with a temperature variation of 30, 50, 70 and 100oC for 3 hours was performed. Reduction on the levels of tannins in stevia extract is done by using activated carbon. The results showed the greatest weight of the extract at 70oC is 1.008 g and extract relatively alkaline pH. Reduction on the levels of tannins on stevia extracts done by passing the extract of stevia in the burette containing activated carbon as much as 4 times the cycle. Tannin concentration was reduced by 39.74%.]]>
<![CDATA[Effect of Tannase on Chemical Parameters of Cashew Apple Juice (Anacardium occidentale Linn) ]]>
<![CDATA[Yunita Arian Sari Anwar]]>
<![CDATA[ ALCHEMY Jurnal Penelitian Kimia Vol 11, No 1 (2015): March ]]>
Publisher : <![CDATA[UNIVERSITAS SEBELAS MARET (UNS) ]]>
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DOI: 10.20961/alchemy.11.1.103.29-37
<![CDATA[We previously produced tannase from Aspergillus niger using solid state medium. In the present study the enzyme used cashew apple juice. The aim this research was to know effect of tannase on chemical parameters of cashew apple juice. The concentration of tannase used was 0%; 0.02%; 0.04%; 0.06%; 0.08% and 0.1% (v/v). The chemical properties of the juice produced by enzymatic method were compared with the juiced produced through high temperature treatment (100oC). This research showed that the addition of 0.1% of tannase enzyme provide the best product according to the lower content of tannins than the content of tannins in the juice produced with high temperature treatment. The tannase treatment did not change the vitamin C content, content of protein and pH. Meanwhile, high temperature treatment decreased the content of vitamin C and protein.]]>
<![CDATA[Photocatalytic Activity of TiO2 Nano Supported on Membrane Cellulose Acetate/Nata De Coco (CA/NDC) in Photodegradation of Methylene Blue ]]>
<![CDATA[Roro Ernia Prawithasari]]>;
<![CDATA[Ilma Fadilah]]>;
<![CDATA[Mudjijono Mudjijono]]>;
<![CDATA[Teguh Endah Saraswati]]>;
<![CDATA[Dwidjono Hadi Darwanto]]>
<![CDATA[ ALCHEMY Jurnal Penelitian Kimia Vol 11, No 1 (2015): March ]]>
Publisher : <![CDATA[UNIVERSITAS SEBELAS MARET (UNS) ]]>
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DOI: 10.20961/alchemy.11.1.113.90-101
<![CDATA[Study of synthesis and effectiveness of membrane catalyst of cellulose acetate/nata de coco-TiO2 nano (CA/NDC-TiO2 nano) in photodegradation of methylene blue in batch system has been investigated. TiO2nanoparticles were synthesized by hydrothermal method followed by calcination at 450oC. Scanning Electron Microscopy (SEM) images indicate nano TiO2 has been successfully synthesized with average particle diameter as 88,63±4,37 nm. X-ray diffraction pattern (XRD) of nano TiO2 shows some characteristic peaks of anatase TiO2 were still existed. Membrane photocatalyst of CA/NDC- nano TiO2 was prepared via phase inversion method by mixing TiO2 nanoparticles with CA casting solution. Thermogravimetric analysis shows three decomposition steps of CA/NDC-nano membrane as well as CA/NDC membrane. Photodegradation of methylene blue was conducted with nano-TiO2 particles and CA/NDC-TiO2 membrane for 50 minutes in batch system. The absorbance changes were measured by spectrophotometer at wavelength of 664.6 nm. The result shows the photodegradation rections tended to follow second order reaction. According to the rate constant value, k, the photocatalytic effectivity using CA-NDC/nano TiO2 membrane and nano TiO2photocatalysts in metilen blue photodegradation, statistically were not significantly different.]]>
<![CDATA[High Performance Liquid Chromatography Method Validation Of α-Mangostin Assay in Mangosteen (Garcinia mangostana L.) Fruit Rind Extract Formulated in Oral Solution ]]>
<![CDATA[Liliek Nurhidayati]]>;
<![CDATA[Siti Sofiah]]>;
<![CDATA[Ros Sumarny]]>;
<![CDATA[Kevin Caesar]]>
<![CDATA[ ALCHEMY Jurnal Penelitian Kimia Vol 11, No 1 (2015): March ]]>
Publisher : <![CDATA[UNIVERSITAS SEBELAS MARET (UNS) ]]>
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DOI: 10.20961/alchemy.11.1.104.38-46
<![CDATA[Mangosteen fruit rind extract contain a lot of antioxidants. α-Mangostin is a component in mangosteen fruit rind that has highest antioxidant effect. The oral solution containing mangosteen fruit rind extract is required an assay method for quality assessment. Determination of a very low concentration of analyte in sample with very complex matrix, such as α-mangostin in oral solution, needs a selective and sensitive method, such as high performance liquid chromatography (HPLC). In this study, α-mangostin assay was performed by reverse phase HPLC system using octadecylsilane (C18) as stationary phase, methanol-water (90:10) as mobile phase, the flow rate is 1.0 mL/min, and the UV detector at 316 nm. The retention time of α-mangostin was 9.622 minutes. Peak of α-mangostin was well separated with resolution of 1.725. Linearity was in the range of 1.67-5.01 ppm with correlation coefficient of 0.9986. The relative standard deviation (RSD) was 1.30 %, the recovery was in the range of 95.80-100.76 ]]>
