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All Journal Jurnal Periodic Jurusan Kimia UNP Jurnal Riset Kimia Indonesian Journal of Chemical Analysis (IJCA) Pelita Eksakta Acta Chimica Asiana Jurnal Pengabdian Pada Masyarakat
Trisna Kumala Sari
Universitas Negeri Padang
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The Extracted Pectin from Ambarella Fruit Peel (Spondias dulcis) as Biosorbent in Adsorption of Cu(II) Metal Ions Trisna Kumala Sari; Elinda Fithriana; Indang Dewata; Desy Kurniawati; Romy Dwipa Yamesa Away
Jurnal Riset Kimia Vol. 14 No. 2 (2023): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v14i2.608

Abstract

Heavy metals are known to seriously injure land plants and animals, including humans, as well as marine species when present in contaminated water. For the batch adsorption technique used in this study, Cu(II) ions were removed from an aqueous solution using an inexpensive  environmentally friendly adsorbent prepared from the extracted pectin of ambarella fruit peel. The functional groups of the extracted pectin were studied using Fourier Transform Infrared Spectroscopy (FT-IR). Operational conditions like pH, contact time, and initial adsorbate concentration were investigated. FTIR characterization showed that pectin was successfully extracted from ambarella fruit peel with the appearance of the peaks at 3331.36 cm-1, 2924.02 cm-1, 1727.38 cm-1, 1626.20 cm-1, 1329.31cm−1, 1232.43cm−1, 994.18 cm−1 and these peaks have similar characteristic with a commercial pectin. The maximum uptake of Cu(II) ions was obtained at a pH of 4, a contact time of 90 min, an initial metal concentration of 150 ppm. The extracted pectin has an adsorption capacity of 6.5860 mg/g for the removal of Cu(II) ions from aqueous solution under the optimum adsorption conditions. In addition, the data obtained from contacting the extracted pectin of ambarella fruit peel in Batang Arau River water showed an adsorption capacity of 0.0376 mg/g. Therefore, the pectin that was extracted from the peel of the ambarella fruit could be used to filter out Cu(II) ions from aqueous solutions.
Development of Non-Enzymatic Glucose Sensor Using Ag-Au Bimetallic Modified Pencil Lead Electrode with Voltammetry Method Marlini, Rahmida; Kumala Sari, Trisna; Alizar, Alizar; Dwipa Yamesa Away, Romy
Indonesian Journal of Chemical Analysis (IJCA) Vol. 8 No. 1 (2025): Indonesian Journal of Chemical Analysis
Publisher : Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijca.vol8.iss1.art9

Abstract

Glucose is an essential monosaccharide that serves as the main source of energy in the human body. An imbalance in glucose levels in the body can lead to serious metabolic disorders, such as diabetes mellitus. Therefore, effective methods of analyzing and monitoring glucose levels are needed for early detection and more optimal disease management. In this study, a non-enzymatic glucose sensor based on Pencil Lead Electrode (PLE) modified with silver-gold (Ag-Au) bimetallic was developed through electrodeposition method using cyclic voltammetry. This modification aims to improve sensitivity and cost efficiency in glucose detection compared to enzymatic sensors, that are susceptible to denaturation and higher production costs. Electrodeposition is performed in a potential range of 1.6 V to -0.4 V to obtain an optimal bimetallic coating on the PLE surface. The Ag-Au/PLE electrode provided the best electrochemical response in detecting glucose, with oxidation and re-oxidation peaks at +0.01 V in 0.1 M KOH as a supporting electrolyte. The optimal condition was obtained in five electrodeposition cycles, with a correlation coefficient value of 0.9984 and a detection limit of 0.206 mM, indicating high sensitivity and accuracy. These results indicate that Ag-Au/PLE electrodes have great potential as reliable, sensitive and economical non-enzymatic glucose sensors.
Development of a Cr(VI) metal ion detection sensor using a modified pencil lead electrode (PLE) with a silver thin layer using the voltammetry method Nella Aulia Putri; Trisna Kumala Sari; Budhi Oktavia; Sherly Kasuma Warda Ningsih
Acta Chimica Asiana Vol. 9 No. 1 (2026)
Publisher : The Indonesian Chemical Society, Chapter Nusa Tenggara and The University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/aca.v9i1.251

Abstract

Chromium(VI) metal ions have harmful effects on the environment and organisms. Chromium(VI) particles can cause chromosomal abnormalities, cross-linking, disruption of the cell cycle, and DNA damage within cells. Therefore, due to its high toxicity, it is crucial to monitor the concentration of chromium(VI) metal ions in the environment. This study aims to detect Cr(VI) metal ions in a simple, rapid, and effective manner. Electrochemical methods are employed to investigate the performance of PLE and Ag/PLE electrodes and to determine the optimal conditions for electrodeposition cycles and supporting electrolyte concentrations in detecting Cr(VI) metal ions. The electrochemical method is based on the specific reaction of the analyte, which generates an electrical signal. The PLE surface is modified with a silver thin layer through electrodeposition using cyclic voltammetry. The silver thin layer used for electrode modification offers several advantages, including improved electron transport and enhanced electrocatalytic response. The results indicate that the performance of Ag/PLE is superior to that of PLE in detecting Cr(VI) metal ions under optimal supporting electrolyte conditions, specifically 0.1 M HNO₃ with one electrodeposition cycle. Calibration curve analysis for Cr(VI) ions yielded the regression equation y = 0.6688x + 0.0085, with a correlation coefficient (R²) of 0.9958 and a limit of detection (LOD) of 0.18 mM.
Co-Authors Alizar, Alizar Bali Yana Fitri Budhi Oktavia DESY KURNIAWATI Desy Kurniawati Desy Kurniawati Dina Agustina Edi Nasra Edwina Zainal Elinda Fithriana Elinda Fithriana Fauzana Gazali Ferdi Henfi Pratama Indang Dewata Indang Dewata Isra Yeni Marlini, Rahmida Muhammad Habibul Ikhsan Mulia, Melindra Nella Aulia Putri Niza Lian Pernadi Rahadian Zainul Riga Riga Romy Dwipa Yamesa Away Roza Herlina Sherly Kasuma Warda Ningsih Sri Benti Etika Suryelita . Syamsi Aini Syamsi Aini Umar Kalmar Nizar Umar Kalmar Nizar Wandi Oktria Yeni, Isra