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All Journal Indonesian Journal of Chemistry JOURNAL OF CHEMICAL NATURAL RESOURCES (JCNaR)
Agung Pratama
Department Of Chemistry, Faculty Of Mathematics And Natural Sciences, University Of Sumatera Utara, Jl. Bioteknologi No.1, Kampus USU, Medan 20155, Indonesia
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Materials Science & Nanotechnology

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Antibacterial Properties of Biofilm Schiff Base Derived from Dialdehyde Cellulose and Chitosan Agung Pratama; Firman Sebayang; Rumondang Bulan Nasution
Indonesian Journal of Chemistry Vol 19, No 2 (2019)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (268.132 KB) | DOI: 10.22146/ijc.34721

Abstract

Cellulose and chitosan are natural polymers that have been used as biocomposite. The aim of this research is to obtain biofilms from chitosan and oxidized cellulose crosslinks. This research is divided into three steps, i.e., isolation of cellulose from oil palm trunk and oxidation of cellulose using NaIO4 (0.2; 0.4; 0.6; 0.8; 1.0 mg/mL) to obtain dialdehyde cellulose (DAC), crosslink of oxidized cellulose with chitosan (DD = 72.85%) to obtain biofilm of chitosan/DAC (CDAC), and characterization of biofilms. The crosslinked reaction was confirmed by FT-IR analysis that showed the spectrum of Schiff base C=N group at 1651 cm–1. Tensile strength increased gradually when the NaIO4 concentration used was 0.2–0.6 mg/mL, but after those concentrations, the tensile strength slightly decreased. The morphology analysis showed that CDAC had smoother morphology than DAC, which was shown rough and showed some particle indicated the presence of unreacted cellulose. CDAC biofilms that prepared with 1.0 mg/mL NaIO4 showed the greatest antibacterial activity.
Antibacterial Soap from Extract Spent Coffee Grounds using Microwave-assisted Extract Against Staphylococcus aureus Sari, Juli Novita; Nasution, Marina Wulandari; Pratama, Agung
Journal of Chemical Natural Resources Vol. 7 No. 1 (2025): Journal of Chemical Natural Resources (JCNaR)
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jcnar.v7i1.20874

Abstract

This study investigates the application of Microwave-Assisted Extraction (MAE) to extract bioactive components from spent coffee grounds (SCG), enhancing the antibacterial properties of transparent soap. Spent coffee grounds, usually regarded as waste, include phenolics, alkaloids, flavonoids, and tannins which demonstrate potent antibacterial properties against Gram-positive bacteria such as Staphylococcus aureus. MAE effectively extracts these useful compounds using ethanol as a solvent, therefore improving the antibacterial power of the soap. Unlike the soap free of the extract, the inclusion of 3% spent coffee ground extract generated an inhibitory zone of 9.16 mm. The soap base is produced using the saponification process with palm oil and sodium hydroxide. The research additionally encompasses pH analysis, foam properties, and evaluations of client preferences. This research highlights the efficiency of MAE in upcycling coffee waste into a functional and sustainable product, offering enhanced antibacterial properties while contributing to waste reduction in personal care products.
Co-Authors Firman Sebayang Marina Wulandari Nasution Rumondang Bulan Nasution Sari, Juli Novita