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All Journal Arfak Chem: Chemistry Education Journal Jurna Beta Kimia
Prastiwi, Dina Alva
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Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Education Social Sciences

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Sintesis Metil Ester sebagai Biodiesel Minyak Biji Kesambi (Schleichera oleosa L.) melalui Esterifikasi dan Transesterifikasi Lailatusholihah, Isna; Suganda, Angga; Mahardika, Micha; Prastiwi, Dina Alva; Situmeang, Boima
Arfak Chem: Chemistry Education Journal Vol. 7 No. 1 (2024): Arfak Chem
Publisher : Universitas Papua, Manokwari, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/accej.v7i1.592

Abstract

Synthesis of methyl ester as biodiesel kesambi seed oil (schleichera oleosa l.) through esterification and transesterification has been successfully conducted. Kesambi seeds are one of the seeds that can produce essential oils, which is about 70%. The methods used in this study are esterification and transesterification. Characterization of methyl ester compound used H-NMR spectrometry The procedure was sample preparation, degumming, esterification, transesterification, and biodiesel quality test. The esterification process had been two steps using a methanol ratio of 20: 1. The biodiesel quality test results are not sufficient from the SNI 04-7182: 2006 standard, where the acid number is 0.718 Mg KOH / g, moisture content 0.32-0.51%, density 840 kg / m3 and viscosity 25.1 Mm2 / s. 
Microemulsion of methanol extract of Tridax procumbens flower and its antibacterial activity against Streptococcus mutans and Enterococcus faecalis Wijayanti, Sri; Pradana, Agrin Febrian; Situmeang, Boima; Prastiwi, Dina Alva; Musa, Weny J.A.
Jurnal Beta Kimia Vol 5 No 1 (2025): Volume 5 Number 1, May 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/jbk.v5i1.21189

Abstract

Tridax procumbens (commonly known as Gletang flower) is a medicinal plant recognized for its antibacterial potential and is widely distributed across various habitats such as rice fields, plantations, and roadsides. Phytochemical screening of its methanolic flower extract revealed the presence of secondary metabolites, including alkaloids, flavonoids, steroids, phenols, terpenoids, and tannins, all of which contribute to its biological activities. This study aimed to develop a microemulsion formulation of T. procumbens methanolic extract and to evaluate its antibacterial activity against Streptococcus mutans and Enterococcus faecalis, two major oral pathogenic bacteria. The microemulsion was prepared using the sonication method and characterized by assessing its pH, transmittance, viscosity, physical stability, and particle size using a particle size analyzer. Antibacterial activity was tested using the Kirby-Bauer disk diffusion method. The results indicated that the microemulsion had particle sizes ranging from 300–1000 nm and demonstrated significantly higher antibacterial activity compared to the crude extract, suggesting improved solubility and enhanced bioactivity of the active compounds. This formulation holds promise as a natural antibacterial agent for the prevention of oral infections.
Co-Authors Lailatusholihah, Isna Mahardika, Micha Musa, Weny J.A. Pradana, Agrin Febrian Situmeang, Boima Sri Wijayanti Suganda, Angga