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Jambura Journal of Chemistry
Published by Universitas Negeri Gorontalo
ISSN : 26563665     EISSN : 26566834     DOI : 10.34312/jambchem
Core Subject : Science,
Chemistry
Jambura Journal of Chemistry is peer-reviewed and open access journal published by Chemistry Depertment, Faculty Mathematic and Natural Science. Jam.J.Chem that publishes original research articles, review articles, as well as short communication in all areas of chemistry including applied chemistry. Jambura Journal of Chemistry publish two issues (numbers) annually (February and August).
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Articles 102 Documents
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Sintesis dan Karakterisasi Komposit TiO2/Fe2O3 Menggunakan Ekstrak Sargassum sp untuk Fotokatalisis Degradasi Rhodamin B Ferdian, Rasyid; Maulida, Alifiani; Putri, Desy Harlina; Jihandini, Syahwa; Aritonang, Anthoni Batahan
Jambura Journal of Chemistry Vol 7, No 2 (2025): August
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jambchem.v7i2.26669

Abstract

Telah dilakukan sintesis komposit TiO2/Fe2O3 dengan metode sol-gel berbasis kimia ramah lingkungan menggunakan ekstrak sargassum sp. Tujuan dilakukannya penelitian ini adalah untuk mengkaji kemampuan senyawa didalam ekstrak sargassum sp dalam pembentukan komposit TiO2/Fe2O3 berukuran nano menggantikan asetilaseton yang bersifat toksik. Sintesis komposit TiO2/Fe2O3 dilakukan menggunakan metode sol-gel dengan prekursor TTIP dan Fe(NO3)3.9H2O disertai penambahan variasi massa ekstrak sargassum sp (0,25g; 0,50g dan 0,75g). Hasil karakterisasi FTIR menunjukkan adanya pita serapan pada bilangan gelombang 500-400 cm-1 yang menandakan terbentuk Fe2O3 diatas permukaan TiO2. Hasil XRD menunjukkan puncak difraksi TiO2 pada 2θ (25,37°, 37,95°, 48,09°, 54,09°, 54,99° dan 62,77, namun hasil adanya puncak difraksi Fe2O3 pada difraktogram XRD. Terjadi penurunan energi celah pita (Eg) pada TiO2 (3,26 eV) menjadi (2,64 eV) setelah membentuk komposit TiO2/Fe2O3. Uji aktivitas efesiensi degradasi Rhodamin B(RhB) dilakukan pada sinar tampak, dan diperoleh efesiensi degradasi sebesar 42,09%.
Computational Study of the Influence of Structure on Antioxidant Activity and Drug Score of Coumarin Derivatives Bakti, Andi Budi; Martoprawiro, Muhamad Abdulkadir
Jambura Journal of Chemistry Vol 7, No 2 (2025): August
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jambchem.v7i2.27350

Abstract

The presence of reactive oxygen species (ROS) in the body must be maintained at low concentrations, excessive ROS and an inability to neutralize them can lead to oxidative stress. Coumarin, a secondary metabolite in plants, is used in pharmacology as an antioxidant agent. This study aims to identify the effects of the type, number, and position of substituents on coumarin derivatives's antioxidant activity and drug score using DFT methods. Computational tools, including ORCA software and OSIRIS Property Explorer, were employed. The results indicate that the number and position of electron-donating substituents, such as OCH3, enhance antioxidant activity, while electron-withdrawing substituents, like CHO, decrease it. Additionally, the presence of conjugated double bonds in the pyrone ring causes electron delocalization, complicating electron transfer. The compound 6,7-dimethoxyhydrocoumarin (hydroscoparone) shows potential as a new antioxidant due to its energy gap similar to commercial antioxidants like ascorbic acid and TBHQ, and a drug score of 0.5 with very low toxicity risk. However, further research is needed to confirm that this compound can be used as an effective antioxidant without side effects.

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