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Ripaldy Apriansya
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Chemistry

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PENYERAPAN LOGAM BERAT SECARA BIOKIMIAWI OLEH BAKTERI GRAM POSITIF DAN GRAM NEGATIF: A MINI RIVIEW Dilo Jhosea Luciano Eduardo; Rudi Kartika; Ripaldy Apriansya; Shaparuddin Nur Arifullah; Muhammad Adhitya Rizkirullah
PROSIDING SEMINAR KIMIA Vol 4 No 1 (2025): Prosiding SNK 2025
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Scenedesmus sp. is a freshwater green alga that functions as an ionic biosorbent and can also be a bioindicator for water contaminated with hexavalent chromium Cr(VI) ion. This study aimed to observe the growth of Scenedesmus sp. exposed to Cr(VI) ion at various concentrations and analyze the remaining Cr(VI) ion that did not undergo biosorption by microalgae. This research was conducted on Scenedesmus sp. microalgae growth media using five bioreactors, each with a different Cr(VI) ion exposure concentration. The remaining ion in the growth media was analyzed for its concentration with an ultraviolet-visible spectrophotometer at time variations with an interval of two days. Maximum biosorption with exposure to Cr(VI) occurred at a concentration of 1.0 ppm on day 12 of 99.93%. At concentrations of 5.0 ppm and 7.0 ppm, microalgae growth was very poor, indicating the medium was toxic. Keywords: Biosorption, Hexavalent Chromium, Scenedesmus sp, Toxicity
REVIEW ARTIKEL: AKTIVITAS ANTIBAKTERI SENYAWA METABOLIT SEKUNDER PADA BEBERAPA EKSTRAK TANAMAN TERHADAP BAKTERI Escherichia coli Ripaldy Apriansya; Rudi Kartika; Shaparuddin Nur Arifullah; Dilo Jhosea Luciano Eduardo; Muhammad Raihan Aswat; Muhammad Adhitya Rizkirullah
PROSIDING SEMINAR KIMIA Vol 4 No 1 (2025): Prosiding SNK 2025
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Indonesia's current biodiversity makes it something valuable for the community. Especially the use of plants that are used as medicinal materials. This is supported by the content of secondary metabolite compounds found in plants such as flavonoids, phenolics, steroids, saponins, tannins and others. These compounds have antibacterial activity that can be used to inhibit the growth of microbes that harm humans. By conducting a literature study of 10 national and international articles in the last 10 years of publication to review the ability of several plants that have potential as antibacterials. Tests were carried out on Escherichia coli bacteria which included the extract solvent used, the content of metabolite compounds in the extract and its activity based on the inhibition zone diameter value and/or minimum inhibitory concentration (MIC). Keywords: Antibacterial, inhibition zone diameter, Escherichia coli, minimum inhibitory concentration, secondary metabolites
Co-Authors Dilo Jhosea Luciano Eduardo Muhammad Adhitya Rizkirullah Muhammad Raihan Aswat Rudi Kartika, Rudi Shaparuddin Nur Arifullah