Category: Volume 1, No. 2 , 2013

Antioxidant Activities of Chloroform and Aqueous Fractions of Myrmecodia pendens Extract: A Preliminary Study

Yohanes Buang,* Ermelinda Noya, Pius D. Ola, and Theo Da Cunha

Department of Chemistry Faculty of Science and Engineering, Nusa Cendana University, Kupang, NTT, INDONESIA

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There have been elucidated the antioxidant activities of chloroform and aqueous fractions of methanol extracts isolated from Myrmecodia pendens. The study was firstly started by maceration of Myrmecodia pendens powder in certain quantity of pure methanol solvent and followed by gradual partition of the methanol extract with chloroform and distillated water and then purified with column chromatography. The chemical contents migrated into both those later solvents were detected by GC-MS and their functional groups were detected by FT-IR instruments. Thereafter, the antioxidant activities of the migrated compounds in each those solvents were determined using hydrogen peroxide protocol and the absorbance was measured at 240 nm. The ascorbic acid solution was used as control. The results showed that FT-IR spectrum showed methylene and ethylene groups are existed within the compounds contained by the extracts as well as the hydroxyl, carbonyl, aromatic, and ketone groups. Furthermore, the GC-MS spectrum indicated the compounds that are existed within the chloroform and the aqueous fractions of the extract. The average absorbance of compounds contained within the chloroform and aqueous fractions were 0.161 and 0.112, respectively, whereas that of the control was 0.085. Those absorbance data conclusively indicated that higher absorbance higher residue of chromophore content existed within the fraction and higher failures of hydroxylation reactions. It was however, the antioxidant activities of the aqueous  fractions were higher than those of the chloroform fractions.

The Antioxidant Compounds Contained in n-Butanol and Aquamor Fractions of Dischidia nummularia Extract

Abner A. Leba, Sherly M. F. Ledoh, and Yohanes Buang
Department of Chemistry, Faculty of Sciences and Engineering, Nusa Cendana University, Kupang

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The Activated Charcoal of Hazelnut Shell (Aleurites moluccana) Has Potential Capability to Refining Used Cooking Oil

Desiana Sanang, Luther Kadang, and Theodore Y. K. Lulan
Department of Chemistry, Faculty of Sciences and Engineering, Nusa Cendana University, Kupang

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Isolation and Characterization of Cinnamaldehyde Contained in Stem Bark of Cinanamon (Cinnamomum burmannii)

Yublina O. Gelang,Theo da Cunha, and Luther Kadang
Department of Chemistry, Faculty of Sciences and Engineering, Nusa Cendana University, Kupang

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The Optimum Condition for Synthesis of Biodiesel from Castor (Ricinus communis) Oil through Transesterification Reaction

Pius Dore Ola, Ria A. Karim, and Maria F. Suherdin
Department of Chemistry, Faculty of Sciences and Engineering, Nusa Cendana University, Kupang

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The optimum conditions of transesterification reaction to provide biodiesel from castor (Ricinus communis) oil was conducted. The biodiesel viscosity, density, free fatty acid content and acid number were compared with Bureau of Indian Standard (BIS). The total oil of castor seed was extracted using petroleum eter, and followed by neutralization using 35 % Na2CO3 (b/v) and the transesterification reaction was by variations in amount of methanol (10, 15, 20 and 25 g), NaOH (0.5; 1.0 and 1.5 g), the time of reactions (30, 60, 90 and 120 minute) and the temperatures of reactions (30, 45 dan 60 oC).  The result showed that extraction process produce oil of castor in amount of 70 – 80 % in rendement, while neutralization processing produced 74.66 % of rendement with decreasing in content of free fatty acid from 1.7 to 0.1. The optimum conditions of reaction for 100 g of castor oil were 20 g of methanol, 1.5 g of NaOH, 60 minute in reaction time and 30 oC in temperature reaction. The purity of biodiesel yielded was between 93.46 – 96.26  % and all of them agreed with the BIS and except for viscosity.

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