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Alchemy Jurnal Penelitian Kimia
Published by Universitas Sebelas Maret
ISSN : -     EISSN : -     DOI : -
Core Subject : Science, Social, Engineering,
Chemical Engineering, Chemistry & Bioengineering Energy Environmental Science Materials Science & Nanotechnology
Arjuna Subject : -
Articles 7 Documents
 1 
Search results for , issue " Vol 8, No 1 (2012)" : 7 Documents clear
AMENTOFLAVONE FROM LEAVES OF NYAMPLUNG (Calophyllum inophyllum Linn.) Wartono, M. Widyo; Wulandari, Dian; Handayani, Nestri; Suryanti, Venty; Marliyana, Soerya D.
Alchemy Jurnal Penelitian Kimia Vol 8, No 1 (2012)
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Abstract

Amentoflavone (1), a biflavonoid was isolated from leaves of Calophyllum inophyllum Linn. Isolation and purification of the compound used maceration and chromatography methods using Si-gell and sephadex LH-20. The structure was determined by UV, IR, 1H and 13C NMR spectroscopy includes HMQC/HMBC analysis and comparison with references.
PREPARATION AND CHARACTERIZATION OF CHITOSAN VANILINE AS ELECTROLYTE POLYMER MEMBRANE Pramono, Edi; Asiska Prabowo, Pandu Satrio; Purnawan, Candra; Wulansari, Jati
Alchemy Jurnal Penelitian Kimia Vol 8, No 1 (2012)
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The research of chitosan modification with vanilin and its characterization as polymer electrolyte membranes was carried out. Chitosan-based shciff base compounds was synthesized  from chitosan and vanilin with pyperidine as catalyst. The polymers were characterized by Fourier Transform Infrared (FTIR) and its cationic exchange capacity, while membranes were characterized by cationic exchange capacity, swelling degree and its thermal stability. The existence of imine vibration peak provides that the chitosan vaniline was succesfully synthesized. The addition of vanillin increases the cationic exchange capasity of membrane, however it decreases the swelling degree. Thermal data indicate the polymer membrane degraded above 250oC with three step degradation. Based on the cationic exchange capacity and its thermal stability, the membrane has a good potential for application in polymer electrolyte membrane fuel cells, but modifications are still needed to reduce the swelling degree of membrane.
CYTOTOXICITY EXTRACT OF RED FRUIT (Pandanus Conoideus Lamk.) WITH BRINE SHRIMP LETHALITY TEST Marliyana, Soerya D.; W, Fajar Rakhman; H, Nestri; Rakhmawati, Rita
Alchemy Jurnal Penelitian Kimia Vol 8, No 1 (2012)
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The cytotoxicity with Brine Shrimp Lethality Test (BSLT) extract of red fruit (Pandanus conoideus Lamk.) have been done. The ethanol and n-hexana extracts were evaluated for cytotoxicities. The n-hexane extract demonstrated higher cytotoxic activity than the ethanol extract, with 54% death in concentration 400 ?g/mL. The n-hexane extract was separated by column chromatography, eluting with a gradient of n-hexane-EtOAc to had an active fraction. The cytotoxicity of an active fraction showed with LC50 values of 138,05 µg/mL. Identification of this fraction exhibited three compounds of fatty acid were palmitic acid, oleic acid, and miristic acid
PREPARATION AND CHARACTERIZATION OF THE MONOMETAL CATALYST Mo/ USY Nugrahaningtyas, Khoirina Dwi; Trisunaryanti, Wega; Triyono, Triyono; Nuryono, Nuryono; Widjonarko, Dian Maruto; Mulyani, Mulyani
Alchemy Jurnal Penelitian Kimia Vol 8, No 1 (2012)
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This research deals with preparing and characterizing the metal based-catalyst of Mo supported on Ultra Stable Y-zeolite (USY) and, is aimed to ascertain the best produced catalyst for hydrotreatment reaction in standpoint of its capabilities on removing the unwanted-heteroatom compounds.Procedure of catalyst treatment was preparation, activation and characterization. Monometal catalyst Mo/USY was prepared under variation concentrations of salt metal precursor (concentrations), i.e 2, 6, 10 and 14% wt. The activation steps were carried out by calcination, oxidation, and reduction. Characterization of catalysts were determined by data of XRD, AAS, acidity, surface area and its porosity. The result shows that these catalysts have several good characters that supporting their usefulness in hydrotreatment-catalytic reaction. In addition, catalyst Mo10/USY performs many ideal criteria as the best functional catalyst.
PREPARATION OF MICROCAPSULE OF CHITOSAN GEL BEADS CROSSLINKED WITH ETHYLENE GLYCOL DIGLYCIDYL ETHER (Psf-Egde-Cts) AS ADSORBENT FOR Procion Red Mx 8b Dye Kusumaningsih, Triana; Handayani, Desi Suci; Lestari, Yuni
Alchemy Jurnal Penelitian Kimia Vol 8, No 1 (2012)
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Microcapsules of chitosan gel beads crosslinked with Ethylene Glycol Diglycidyl Ether (PSF-EGDE-CTS) were prepared to improve adsorption capacity and mechanical stability of chitosan at acidic condition. These microcapsules were prepared through three step i.e. the formation of gel beads (CTS), crosslinked CTS with EGDE (EGDE-CTS) and microencapsulation of EGDE-CTS with Polysulfone (PSF-EGDE-CTS). Product characterizations were carried out using FTIR and SEM. The adsorptions were carried out by variation of pH and contact time in order to determine the optimum condition of adsorption. The yield of Microcapsules PSF-EGDE-CTS was 94,79 wt %. The optimum condition of Procion Red MX 8B dye adsorption by PSF-EGDE-CTS is at pH 5 and 24 hours of contact time. The adsorption capacity of PSF-EGDE-CTS is 40,69 mg/g.
CATALYST TABLET OF Cu-TiO2/GRAPHITE FOR PHOTO-AND ELECTRO-ASSISTED DEGRADATION OF REMAZOL YELLOW FG Rahmawati, Fitria; Apriyani, Rochmi I.; Rahardjo, Sentot B.
Alchemy Jurnal Penelitian Kimia Vol 8, No 1 (2012)
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Titanium dioxide (TiO2) film was supported on graphite (G) by means of chemical bath deposition (CBD) from TiCl4precursor. Meanwhile surfactant cetyl trimethyl ammonium bromide (CTAB) was added as linking and assembling agent between titanium network and graphite substrate. Cu was deposited electrochemically from 0.4 M of CuSO4solution at 0.03 A of electric current. The tablets of TiO2/G and Cu-TiO2/G were used as catalyst for photocatalytic degradation (PC), electrocatalytic degradation (ED) and photoelectrocatalytic (PEC) degradation of Remazol Yellow FG. In degradation system which used TiO2/G tablet, the highest rate constant, k, was achieved by PEC method, kwas 2.8´10-3 min-1, as well as in the system which used Cu-TiO2/G tablet. However, this research founded that direct oxidation by external electric field contribute more to degradation process than photocatalytic mechanism, proved by high rate constant of ED, k was 2.6´10-3 min-1. Meanwhile,  rate constant of photocatalytic degradation was 5´10-4min-1. This research also founded that TiO2 film highly contribute in degradation process due to the fact that rate constant of electrodegradation by using blank graphite is low, k was 5´10-4 min-1. Meanwhile, deposition of Cu onto TiO2 did not enhance degradation rate of remazol yellow by PEC method, however it enhanced the rate constant of ED to 2.7´10-3 min-1. The FTIR analysis to the completedly degraded remazol yellow FG solution shows disappearance of N=N stretching at 1559 cm-1and uas CH2 at 2919 cm-1. This indicates that molecular structure of remazol yellow has been degraded succesfully then convert this dye solution into clear solution.
IDENTIFICATION AND ANTIBACTERIAL ACTIVITY TEST OF THE MIMBA LEAF (Azadirachta Indica A. Juss) Handayani, Nestri; Wartono, M. Widyo; Murti, Riskha Kurnia
Alchemy Jurnal Penelitian Kimia Vol 8, No 1 (2012)
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The purpose of this research was to evaluate antibacterial activity of Neem (Azadirachta indica A. Juss) leaves fraction against some pathogenic bacterial and to identificate the most active fraction. Leaves powder of Neem was macerated with ethanol and factionated by vacuum liquid chromatography using hexane, ethyl acetate and ethanol as eluent, respectively. The antibacterial activity of the fraction was evaluated by diffusion method, then the most active fraction of antibacterial was evaluated by zone of inhibition. The most active fraction of antibacterial was evaluated for Minimum Inhibitory Concentration (MIC) and equivalent value, compared with amoxicillin and chloramphenicol, then identified using phytochemical screening and Gass Chromatography-Mass Spectroscopy (GC-MS).The fraction of Neem leaves fractionated by vacuum liquid chromatography had antibacterial activity againstStaphylococcus epidermidis, Bacillus cereus, and Shigella flexneri. The ethyl acetate fraction showed the most active fraction of antibacterial against all bacterial tested. Ethyl acetate fraction had MIC 0.075% againstStaphylococcus epidermidis 0.05% against Bacillus cereus and Shigella flexneri. The antibacterial activity of ethyl acetat fraction compared to amoxicillin was 0.01% for S. epidermidis, 0.02% for B. cereus, and 0.02% for S. flexneri. Then compared to chloramphenicol was 0.04% for S. epidermidis, 0.02% for B. cereus, and 0.06% for S. flexneri. The result of GC-MS showed that the ethyl acetate fraction contained palmitic acid, ethyl linoleolate, stearic acid, trans-phytol, DOP (di octyl phthalate), and suggested 1 class of compound fatty acid and 5 classes of compound triterpenoids.

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