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All Journal Current Biochemistry Jurnal Jamu Indonesia Jurnal Ners
Ilham Kurniawan
Department of Biochemistry, IPB University
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Education Health Professions Medicine & Pharmacology Nursing Other

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The Efficiency of Melanoidin Based-Waste Degradation with Different Biological Methods Hafizh Zahra; Ilham Kurniawan; Abdurrahman Hakim
Current Biochemistry Vol. 7 No. 2 (2020)
Publisher : IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/cb.7.2.2

Abstract

Each processing palm fresh fruit bunches (FFB) into Crude Palm Oil (CPO) will produce solid and liquid waste. One of the forms of liquid waste produced is Palm Oil Mill Effluent (POME). POME waste can cause problems for the environment because it has physical characteristics of dark brown color, high density, rich in organic matter, and bad smell. The POME waste color is thought to come from melanoidin, a biopolymer pigment produced by the Maillard reaction of coconut processing. Apart from melanoidin, phenolic components are detected in POME waste, where this group of compounds is toxic. Several studies have shown that Lactobacillus plantarum can reduce the color of POME by 75%. The decolorization process is thought to involve an enzyme as a waste color-changing agent. However, the efficiency associated with these events has not been further investigated. There are three main methods of melanoidin degradation, such as biological, physicochemical, and enzymatic. This study uses the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyzes) approach in creating a short, concise, and clear summary through various references.
Review: Gallotannins; Biosynthesis, Structure Activity Relationship, Anti-inflammatory and Antibacterial Activity Ilham Kurniawan; Hafizh Zahra
Current Biochemistry Vol. 8 No. 1 (2021)
Publisher : IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/cb.8.1.1

Abstract

Tannins are one of the main compounds in plants with potential health benefits. Gallotannin is one of the biologically active tannins groups produced by some medicinal plants. Gallotannins is a hydrolyzable tannin compound biosynthesized through gallic acid, shikimic acid, and pentagalloylglucose pathways. Gallotannins can be separated by cascade solvent extraction procedures, column chromatography, and preparative HPLC. This review focuses on the discussion of biosynthesis and structure-activity relationship of tannins as antibacterial and anti-inflammatory. The structure-activity relationship (SAR) and biological activity of gallotannins is caused by the molecular bonds between gallotannins and certain other compounds, especially proteins, which make complex compounds, change physiological and morphological processes in bacterial cells or tissues. The biological activities of gallotannin include anti-inflammatory, anticancer or antitumour, antiviral, antioxidant, antibacterial, and antidiabetic. This review used the Preferred Reporting Items for Systematic Review and Meta-Analyses (PRISMA) method approach in a short, concise, and clear summary about tannins through various references. Keywords: Biological activities, Biosynthesis, Gallotannins
Novel Compounds Design of Acertannin, Hamamelitannin, and Petunidin-3-Glucoside Typical Compounds of African Leaves (Vernonia amygdalina Del) as Antibacterial Based on QSAR and Molecular Docking Kurniawan, Ilham; Ambarsari, Laksmi; Kurniatin, Popi Asri; Wahyudi, Setyanto Tri
Jurnal Jamu Indonesia Vol. 8 No. 2 (2023): Jurnal Jamu Indonesia
Publisher : Tropical Biopharmaca Research Center, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jji.v8i2.326

Abstract

Antibacterial secondary metabolites such as tannins and their derivatives are found in the Vernonia amygdalina Del. Antibiotic resistance can develop due to overuse, reducing the efficacy of drugs to prevent and treat infections. This research aims to use the Quantitative Structure-Activity Relationship (QSAR) and the semi-empirical method Austin Model 1 (AM1) to design a modified novel compound from African leaves that has improved antibacterial activity. This research includes a descriptor calculation of QSAR using AM1 MOE on typical compounds from African leaves, and calculation results are chosen based on a multilinear regression statistical analysis. The model equation represents the three primary parameters of QSAR, which are electronic, hydrophobic, and steric parameters, which will be used to measure modified compounds. Molecular docking using Autodock Tools (The Scripps Research Institute, USA), and analysis of results of docking Autodock Tools using Discovery Studio 3.5 Client. The best QSAR model obtained is LogEC50 = (0.829 x LogP) - (1,302 x AM1_HOMO) - (0.339 x AM1_dipole) - (5,128 x mr) + (0.145 x vol) - (11,355). The results showed that EC50 prediction of modified hamamelitannin has the best activity with the lowest ΔGbind -9.0 kcal/mol and inhibition constant of 0.249 μM. In summary, the novel compound's design calculation has better antibacterial activity, as indicated by a lower EC50, than fosfomycin or compounds without modification. The modified hamamelitannin compound was found to have better antibacterial activity (prediction EC50 = 0.1933 μM) than the original (experimental EC50 = 145.50 μM).
Unlocking Antibacterial Potential: Thiophene-2-carbaldehyde Modification of Acertannin from African Leaves as MurA Enzyme Inhibitors Kurniawan, Ilham; Winarno, Nabilla Suhasfi
Jurnal Ners Vol. 9 No. 4 (2025): OKTOBER 2025
Publisher : Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jn.v9i4.49392

Abstract

The global rise of antimicrobial resistance underscores the need for novel inhibitors targeting essential bacterial enzymes such as UDP-N-acetylglucosamine enolpyruvyl transferase (MurA). This study evaluates the antibacterial potential of three natural polyphenols—Acertannin from African leaves and structurally modified with Thiophene-2-carbaldehyde (TC) to enhance MurA inhibition. A validated QSAR model, incorporating hydrophobic, electronic, and steric descriptors, predicted significantly lower EC₅₀ values for TC-modified compounds, with TC-acertannin showing the highest predicted potency (EC₅₀ = 0.382 µM). Molecular docking revealed strong binding affinity to MurA, with ΔG = −7.8 kcal/mol and Ki = 1.88 µM, involving key interactions such as hydrogen bonding, π-anion, and π-sulfur contacts with residues CYS115, ARG120, ASN23, ARG91, LYS22 and GLU188. PASS prediction further indicated enhanced antibacterial activity and membrane-related mechanisms, with TC-Acertannin showing a Pa of 0.923 for membrane integrity agonism. These results highlight TC-modified tannin as promising MurA-targeted antibacterial agents and support the rational design of natural product-based inhibitors to combat antibiotic-resistant bacteria
Co-Authors Abdurrahman Hakim Hafizh Zahra Hafizh Zahra LAKSMI AMBARSARI Setyanto Tri Wahyudi Winarno, Nabilla Suhasfi