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Indonesian Journal of Chemistry

ijc
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Published by Universitas Gadjah Mada

ISSN : 14119420 EISSN : 24601578 DOI : -

Core Subject : Science, Engineering,

Chemical Engineering, Chemistry & Bioengineering Chemistry

Indonesian Journal of Chemistry is an International, peer-reviewed, open access journal that publishes original research articles, review articles, as well as short communication in all areas of chemistry including applied chemistry. The journal is accredited by The Ministry of Research, Technology and Higher Education (RISTEKDIKTI) No : 21/E/KPT/2018 (in First Rank) and indexed in Scopus since 2012. Since 2018 (Volume 18), Indonesian Journal of Chemistry publish four issues (numbers) annually (February, May, August and November).

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Articles 8 Documents

Search results for , issue "Vol 1, No 3 (2001)" : 8 Documents clear

EFFECT OF MATRICES ON PERCENT EXTRACTION OF SILVER (II) FROM BLACK/WHITE PRINTING PHOTOGRAPHIC WASTE USING EMULSION LIQUID MEMBRANE TECHNIQUE Imam Santoso; Buchari Buchari
Indonesian Journal of Chemistry Vol 1, No 3 (2001)
Publisher : Universitas Gadjah Mada

Extraction of silver (I) has been studied from black/white printing photographic waste by emulsion liquid membrane technique. Composition emulsion at the membrane phase was cerosene as solvent, sorbitan monooleat (span 80) as surfactant, dimethyldioctadesyl-ammonium bromide as carrier and as internal phase was HNO3. Optimum condition was obtained: ratio of internal phase volume and membrane phase volume was 1:1 : concentration of surfactant was 2% (v/v) : time of making emulsion was 20 second : rate of stiring emulsion was 1100 rpm : rest time emulsion was 3 second : rate of emulsion volume and external phase volume was 1:5 : emulsion contact rate 500 rpm : emulsion contact time was 40 second : concentration of silver thiosulfate as external phase was 100 ppm : pH of external phase was 3 and pH of internal phase was 1. Optimum condition was applied in silver(I) extraction from black/white printing photographic waste. It was obtained 77.33% average which 56.06% silver (I) average of internal phase and 22.66% in the external phase. Effect of matrices ion decreased silver(I) percent extraction from 96,37% average to 77.33% average.

IMPREGNATION OF 2-MERCAPTOBENZOTHIAZOLE ON DIATOMACEOUS EARTH AND ITS APPLICATION AS MERCURY(II) ADSORBEN IN AQUEOUS MEDIUM Agung Purwanto; Narsito Narsito
Indonesian Journal of Chemistry Vol 1, No 3 (2001)
Publisher : Universitas Gadjah Mada

An adsorbent was prepared by impregnating 2-mercaptobenzo-thiazole onto polystirene treated diatomaceous earth support. This adsorbent was then applied to adsorb mercury(II) in aqueous medium. The mercury(II) adsorption characteristics of the adsorbent was studied by the use of the original diatomaceous earth as reference. Interaction of mercury(II) and both of diatomaceous earth as well as MBT-diatomaceous were performed in a aqueous batch system to include the following parameters: (a) medium acidity and (b) mercury(II) adsorption characteristic on MBT-diatomaceous with and without the present of other metal ions. In the present work quantification of mercury(II) adsorption was done by determining the mercury concentration left in the solution after adsorption. A cold vapour-generation atomic absorption spectroscopy technic was used in this determination.The experiment results show, that the adsorption affinity of MBT-diatomaceous is higher than the original diatomaceous earth. The total adsorption energy of mercury(II) for diatomaceous earth (24.702 kJ/mol) and MBT-diatomaceous (46.942 kJ/mol) suggest that the interaction is chemisorption. The mercury(II) maximum adsorption on diatomaceous earth is obtained at pH 6, while similar adsorption on MBT-diatomaceous practically was not influenced by pH changes. The present of other metals, i.e. Fe(III), Co(II), Ni(II), Cu(II), Cd(II) and Zn(II) in solution does not give any appreciable influence to the adsorption affinity of MBT-diatomaceous to mercury(II); the total sum of the mercury(II) adsorbed is constantly high, almost 100 %.

KINETICS OF THE ACETYLCHOLINESTERASE (AchE) INHIBITION Hendry Yanuar
Indonesian Journal of Chemistry Vol 1, No 3 (2001)
Publisher : Universitas Gadjah Mada

Acetylcholinesterase (AchE) is an enzyme, which work on acetylcholine hydrolysis. Some insecticides can inhibit the activities of this enzyme. The purpose of this research was determined the kinetics of the AchE inhibition over the organophosphate and carbamat inhibitors with the methylindoxylacetate (MIA) as a substrate. The AchE extract was obtained from the local honeybee head (100 heads on the 5 mL of phosphate buffer 0.05 M). Based on the preliminary analysis, the volume of the enzyme extract for the reaction rate was 100 mL on 1-5 mL of the substrate. Monocrothopos, Carbophenathion, Baycarb and MIPC were used as inhibitors which the concentration were 0.0018, 0.0030, and 0.0042 mg/mL respectively. The reaction rate were measured by Fluorescence HPLC Monitor (Shimadzu RF 535) at 540 nm, and some computational program were used on data analysis. The result of this research showed that the maximum rate of MIA hydrolysis by AchE without the presence of inhibitor was 5.16 mL/s and the hydrolysis constant (Km) was 3.49, and the inhibitors did not influence the maximum rate of substrate hydrolysis. It was finally concluded that the kinetics of AchE inhibition on MIA hydrolysis over the organophosphate and carbamat inhibitors was the competitive inhibition.

CHEMICAL CONSTITUENTS FROM THE STEM BARK OF Alangium kurzi, Craib Sofyan M Nur; Soetijoso Soemitro; Husein Hernandi Bahti; Ponis Tarigan; Yue Mao Shen; Rymond J Rumampuk
Indonesian Journal of Chemistry Vol 1, No 3 (2001)
Publisher : Universitas Gadjah Mada

Three new chemical constituents have been isolated from the stem bark of Alangium kurzii Craib. The structures were respectively determined to be 4-cyclohexene-1,2,3-triol 1, 3-β-stigmast-5-en-3-ol (β-sitosterol 2), and 3-O-β-D-glucopyranosyl-stigmast-5-ene (daucosterol 3). These compounds are preliminary isolated from this plant.

AN EFFICIENT SYNTHESIS OF 1,3-BENZODIAZINE-2,4-DIONES ANALOGS Fredryk Mandey
Indonesian Journal of Chemistry Vol 1, No 3 (2001)
Publisher : Universitas Gadjah Mada

An investigation of base promoted reaction of phenylanthranilate and isocyanate has been carried out. The reaction between phenylanthranilate (11) and phenylisocyanate and n-butylisocyanate gave remarkable yields of corresponding 1,3-Benzo-diazine-2,4-diones (12a) and (12b).

IDENTIFICATION AND SEQUENCING BY NMR SPECTROSCOPY OF THE CARBOHYDRATE MOIETY IN A SAPONIN FROM Barringtonia asiatica Rymond J Rumampuk
Indonesian Journal of Chemistry Vol 1, No 3 (2001)
Publisher : Universitas Gadjah Mada

A trisaccharide chain in a saponin from the seeds of Barringtonia asiatica has been identified and sequenced as {[b-D-galactopyranosyl(1®3)- b-D-glucopyranosyl(1®2)]-b-D-glucuronopyranosyloxy} using a combination of homonuclear and heteronuclear correlation NMR spectroscopy. The 1H and 13C NMR signals of the sugar residues can be determined and distinguished from one other by use of the HMQC-TOCSY technique. Anomeric configurations were unambiguously assigned from the vicinal coupling constants 3JH-1,H-2 of the anomeric protons. Inter-glycosidic linkage assignments were elucidated using HMBC.

SYNTHESIS of 3.4-METHYLENEDIOXYPHENYL-2-PROPANONE from SAFROLE Hanoch J Sohilait; Hardjono Sastrohamidjojo; Sabirin Matsjeh; J Stuart Grossert
Indonesian Journal of Chemistry Vol 1, No 3 (2001)
Publisher : Universitas Gadjah Mada

The Synthesis of 3.4-methylenedioxyphenyl-2-propanone from safrole has been achieved through conversion of allyl group to secondary alcohol, followed by oxidation with pyridinium chlorochromate(PCC). The secondary alcohol has been achieved by two methods. The first method was formic acid adition reaction, followed by hydrolysis in aqueous ethanolic solution of potassium hydroxide. The second method was the oxymercuration-demercuration reaction of safrole. The addition reaction of safrole with formic acid yield safrylformate (34,70%). The hydrolysis of safrylformate with 3M KOH produced safrylalchohol (73,29%). The oxymercuration-demercuration reaction of safrole with Hg(OAc)2-NaBH4 gave (74,37%) of safrylalcohol. The oxidation of safryalcohol with PCC gave 3.4-methylenedioxyphenyl-2-propanone as a main target in 71,83%. The structure elucidations of these products were analyzed by FTIR , 1H-NMR, 13C-NMR and MS.

GOLD IS EARNED FROM THE PRODUCTION OF THAI GOLD LEAF Dirk Bax
Indonesian Journal of Chemistry Vol 1, No 3 (2001)
Publisher : Universitas Gadjah Mada

Thai people like to cover sacred objects or things dear to them with gold leaf.. Statues of Buddha are sometimes covered with so many layers of gold leaf that they become formless figures, that can hardly be recognized. Portraits of beloved ancestors, statues of elephants and grave tombs are often covered with gold leaf. If one considers the number of Thai people and the popularity of the habit, the amount of gold involved could be considerable.

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