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All Journal Journal of Applied Chemical Science JMM (Jurnal Masyarakat Mandiri) Jurnal Fisika : Fisika Sains dan Aplikasinya BIO-EDU: Jurnal Pendidikan Biologi Jurnal Ilmiah Berkala: Sains dan Terapan Kimia
Theodore Y. K. Lulan
Department Of Chemistry Faculty Of Science And Engineering, Nusa Cendana University
Astronomy Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Materials Science & Nanotechnology Physics Social Sciences Other

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Journal : Journal of Applied Chemical Science

 1 
The Antioxidant Activities of the Methanol Extracts of Dischidia nummularia Yakoba Tari; Theo Da Cunha; Theodore Y. Lulan; Yohanes Buang
Journal of Applied Chemical Science Volume 1, No. 1 , 2012
Publisher : Journal of Applied Chemical Science

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Abstract

There has been elucidated the antioxidant activities of chloroform and aqueous fract ions of methanol extracts isolated from dischidia nummularia. The study was firstly started by maceration of dischidia nummularia 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 read at 240 nm. The ascorbic acid solution was used as control. The results showed that GCMS spectrum indicated the phenol compounds only that are existed within the chloroform and the aqueous fractions of the extract. Furthermore, the FT-IR spectrum showed methylene and ethene groups are existed within those phenol compounds as well as the hydroxyl, carbonyl, aromatic, and keton groups. The average absorbances of compounds contained within the chloroform and aqueous fractions were 0.275 and 0.189, 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. Overall, the antioxidant behaviors of the aqueous and chloroform fractions of the dischidia nummularia methanol extracts are contributed by the phenol compounds and the activities of their aqueous fractions are higher than those of the chloroform fractions.
The Activated Charcoal of Hazelnut Shell (Aleurites moluccana) Has Potential Capability to Refining Used Cooking Oil Desiana Sanang; Luther Kadang; Theodore Y. K. Lulan
Journal of Applied Chemical Science Volume 1, No. 1 , 2012
Publisher : Journal of Applied Chemical Science

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Abstract

The research that aims to determine the ability of chandlenut shell activated carbon as adsorbent on purification adible frying oil has been done. Frying oil purification process includes of the removal phase seasoning (despicing), neutralization and bleaching using activated carbon. The results showed that the optimum amount of chandlenut shell activated carbon which interacted with adible frying oil on purification process at 0,75 grams, effectively lowering the acid value (0,2984 mg KOH / g), peroxide value (3,2847 meq / Kg), water content (0,1468%) and free fatty acid levels (0,1261%), and increasing numbers saponification (196,2711 mg KOH / g) and also clear oil. However, peroxide value and oil colors result of interacted with the chandlenut shell activated carbon, do not meet the National Standard of Indonesia.
Co-Authors Desiana Sanang Imanuel Gauru Lanamana, Willybrordus Laurentius Dominicus Gadi Djou Luther Kadang Murdaningsih Murdaningsih, Murdaningsih Novita Santalia Nika Reinner Ishaq Lerrick Sefrinus Maria Dolfi Kolo Siburian, Rikson A.F Theo Da Cunha Yakoba Tari Yohanes Buang