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All Journal JURNAL LPPM BIDANG SAINS DAN TEKNOLOGI Communications in Science and Technology Indonesian Journal of Chemical Studies (Indones. J. Chem. Stud.)
Munandar, Nurharis
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Chemistry Education Engineering

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Green synthesis of copper oxide (CuO) nanoparticles using Anredera cordifolia leaf extract and their antioxidant activity Munandar, Nurharis; Kasim, Syaharuddin; Arfah, Rugaiyah; Basir, Djabal Nur; Hala, Yusafir; Zakir, Muhammad; Natsir, Hasnah
Communications in Science and Technology Vol 7 No 2 (2022)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.7.2.2022.1004

Abstract

Our present study describes the green synthesis of copper oxide nanoparticles (CuONPs) using a leaf extract from Anredera cordifolia (AC). The presence of flavonoids, saponins, and alkaloids in the plant extract was confirmed by phytochemical analysis, and these chemicals can be used as reducing, stabilizing, and capping agents. UV-Vis Spectrophotometry, XRD, FT-IR, and SEM-EDS were used to characterize the CuONPs. The UV-Vis spectroscopy of the biosynthesized CuONPs revealed an absorption peak at 325 nm. The XRD graph also revealed that the Debye-Scherrer formula observed an average crystalline size of around 43.47 nm. EDS analysis confirmed the composition and purity of CuONPs. The presence of functional groups -OH, C=O, and C-O triggers the synthesis of CuONPs, according to FT-IR analysis. Furthermore, the CuONPs antioxidant property inhibited free radicals as antioxidants with an IC50 value of 34.20 g/mL.
Adsorpsi Simultan Ion Cd(II) pada Abu Dasar Batubara Teraktivasi Anwar, Chairil; Wijaya, Dwi Putra; Munandar, Nurharis; Bonaventura, Ridho; Hutagalung, Fajar Y.S.T.
JURNAL LPPM BIDANG SAINS DAN TEKNOLOGI Vol. 9 No. 2 (2024): JLPPM SAINTEK
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35801/jlppmsains.9.2.2024.60653

Abstract

Telah dilakukan penelitian tentang adsorpsi simultan ion Cd(II) menggunakan abu dasar batubara teraktivasi. Penelitian dilakukan dengan mengaktivasi abu dasar batubara menggunakan HCl pekat. Karakterisasi abu dasar batubara teraktivasi dilakukan dengan menggunakan spektrofotometer infra merah dan difraktometer sinar-X. Parameter yang dipelajari meliputi pengaruh pH dan variasi waktu konta. Mekanisme adsorpsi diketahui melalui desorpsi dengan menggunakan pelarut aquades dan KNO3. Konsentrasi ion logam yang tersisa setelah adsorpsi dan desorpsi ditentukan dengan menggunakan spektrofotometer serapan atom. Hasil karakterisasi menunjukkan bahwa abu dasar batubara teraktivasi telah terbentuk dengan baik. Kondisi optimum adsorpsi ion logam Cd(II) abu dasar batu bara teraktivasi adalah pH 5 dan waktu kontak 60 menit. Parameter kinetika adsorpsi abu dasar terakteraktivasi mengikuti persamaan kinetika pseudo orde dua dengan nilai konstanta laju pada ion Cd (II) 0,209 dan 1,734 g.mg-1.min-1. Model isoterm adsorpsi mengikuti model isoterm Langmuir dengan konstanta kesetimbangan sebesar 13125,6 L.mol-1. Kapasitas adsorpsi sebesar 1,0433 x 10-5 dan melibatkan energi adsorpsi sebesar 23,49. Mekanisme adsorpsi simultan ion Cd(II) dipengaruhi oleh berbagai interaksi yaitu: mekanisme pemerangkapan (28,26), mekanisme pertukaran ion (23,06).
Synthesis of Cu Nanoparticles using Anredera cordifolia Extract and their Potential as Antidiabetic with Alpha Amylase Enzyme Inhibition Munandar, Nurharis; Aritonang, Henry F.; Bonaventura, Ridho; Wijaya, Dwi Putra
Communications in Science and Technology Vol 10 No 2 (2025)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.10.2.2025.1829

Abstract

This study reports a green synthesis of copper nanoparticle using binahong (Anredera cordifolia) leaf extract as both a bioreductant and a capping agent. The synthesis was optimized by varying the extract-to-precursor ratio (1:3, v/v) and the reaction pH (6–11) with pH 10 selected as the optimal condition for nanoparticle preparation. Nanoparticle formation was confirmed using UV–Vis spectroscopy, showing a strong absorption band at 325 nm, indicative of oxide-based copper nanostructures and/or surface oxidation during green synthesis. XRD patterns revealed Cu2O as the dominant crystalline phase, characterized by reflections at 2θ ≈ 29.6°, 36.4°, 42.3°, 61.3°, 73.5°, and 77.3°, with a possible minor contribution from metallic Cu due to peak overlap. FTIR spectra confirmed the presence of biomolecules (O–H and C–H bands, along with carbonyl/COO−-related bands) involved in nanoparticle stabilization, as well as Cu–O vibrations around 600–620 cm−1 consistent with Cu2O. PSA showed a dominant hydrodynamic size in the 60–70 nm range (average 65 nm), whereas SEM indicated aggregation into micrometer-scale clusters upon drying. In vitro α-amylase inhibition assays demonstrated concentration-dependent inhibition, with CuNPs (IC50 6.18 μg/mL) and the extract + CuNPs mixture (IC50 6.83 μg/mL) approaching that of acarbose (IC50 5.04 μg/mL) and exhibiting stronger activity than the extract alone (IC50 8.89 μg/mL). The key contribution of this work is the development of a simple, aqueous, environmentally friendly route that leverages local biological resources while producing Cu2O-rich nanoparticles with α-amylase inhibitory activity approaching that of acarbose. These findings highlight the promise of a low-cost antidiabetic candidate for postprandial glucose control and provide a basis for further investigations into nanoformulation and preclinical evaluation.
Adsorption-Desorption of Cd(II) and Mg(II) Ions by Dithizone-Immobilized Coal Bottom Ash Wijaya, Dwi Putra; Bonaventura, Ridho; Munandar, Nurharis; Hutagalung, Fajar; Anwar, Chairil
Indonesian Journal of Chemical Studies Vol. 4 No. 2 (2025): Indones. J. Chem. Stud. December 2025
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v4i2.76

Abstract

Dithizone-immobilized coal bottom ash (DICBA) was successfully prepared as Cd(II) and Mg(II) adsorbent. The parameters examined in the metal ion adsorption study included the effect of pH, adsorbent mass, contact time, and initial concentration. Sequential desorption was examined using H2O, KNO3, HNO3, and Na2EDTA. The results showed that dithizone had been successfully immobilized on the activated coal bottom ash, as verified by FTIR spectroscopy and XRD analyses. Specific wavenumbers observed included the aromatic group C=C at 1496 cm-1, the C-N group at 1319 cm-1 and the Si-O-Si at 1087 cm-1 with d-spacing values of 8.313 and 6.046 Å. The optimum conditions for adsorption were 60 min for Cd(II) and 90 min for Mg(II) at a pH of 5 with 0.2 g of adsorbent mass, and an initial concentration of Cd(II) at 50 ppm. The adsorption kinetics of Cd(II) and Mg(II) followed the Ho pseudo-second-order model with 0.174 and 0.285 (g/mol·min) rate constants for Cd(II) and Mg(II), respectively. The highest correlation coefficients (R2) were 0.995 for Cd(II) and 0.999 for Mg(II). Isotherm modeling indicated that the adsorption of Cd(II) best fitted the Langmuir model (R² = 0.988), followed by the Dubinin–Radushkevich (R² = 0.952), Freundlich (R² = 0.843), and Temkin (R² = 0.827) models. The desorption mechanism for Cd(II) and Mg(II) was formed by various interactions, such as physical mechanism (28.25% and 26.26%), ion exchange (23.13% and 14.15%), hydrogen bond formation (16.90% and 12.11%), and the mechanism of complex formation (9.56% and 6.13%).
Co-Authors Arfah, Rugaiyah Bonaventura, Ridho Chairil Anwar Djabal Nur Basir Dwi Putra Wijaya Hasnah Natsir Henry Aritonang Hutagalung, Fajar Hutagalung, Fajar Y.S.T. Muhammad Zakir Syaharuddin Kasim Yusafir Hala