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The Effect of Acetonitrile Solvent on the Quantitative Determination of Europium (III) by Voltammetry and its Optimization using the Box-Behnken Design Uji Pratomo; Ari Hardianto; Yeni Wahyuni Hartati; Husein Hernandi Bahti; Santhy Wyantuti
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 8, No. 1, May 2022
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v8i1.22508

There is often a drawback during the determination of Eu in aqueous solvents using the voltammetric method. The current signal from water can reduce that of the element, which causes difficulty while separating the Eu signal from other rare earth elements (REE). Therefore, this study used acetonitrile as a solvent due to its high electrical conductivity and wide potential range. The optimum conditions for the determination of Eu in acetonitrile using the Box-Behnken design include 74.56 seconds deposition time, 0.125 V amplitude modulation, and -2.0 V potential deposition. The platinum electrode's performance showed a recovery value of 98.91% and accuracy and precision (in %RSD) of 96.67% and 1.11%, respectively. Furthermore, detection and quantitation limits of 0.6 mg/L and 5.1 mg/L were recorded from the analysis. It concluded that the differential pulse voltammetry method was applied to determine the presence of Eu in acetonitrile.

Colorimetric Sensing of Ascorbic Acid Using Cu-Phen MOFs and Subsequent Digital Image Analysis with Smartphone M. Lutfi Firdaus; Rizki M. Okumura; Euis Nursaadah; Dewi Handayani; Afrizal Mayub; Lena Rahmidar; Muhamad Diki Permana; Annisa Luthfiah; Santhy Wyantuti; Diana R. Eddy; Yeni Wahyuni Hartati
Science and Technology Indonesia Vol. 8 No. 4 (2023): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2023.8.4.660-665

Vitamin C, also known as ascorbic acid, is a crucial nutrient involved in a number of enzymatic processes for tissue healing. Additionally serving as an antioxidant, ascorbic acid is crucial for keeping the immune system strong. It is essential to create a quantitative analytical approach to ascertain ascorbic acid concentration in many samples since its consumption from the daily food should be in the proper quantity. Here, we present a colorimetric probe made of synthetic metal-organic frameworks (MOFs) that changes its color only when samples containing ascorbic acid are present. In this study, phenanthroline served as an organic ligand or linker while copper served as the core metal that formed bonds with it. Cu-Phen MOF color fluctuations at 410 nm (from 408 nm to 412 nm) are linearly related to variations in light absorption. Moreover, as a substitute for spectrophotometry UV-visible, we have created a digital image-based colorimetry. The Cu-Phen MOFsâ€™ color change has the maximum slope and linearity when the blue color intensity is used. The detection limit with high precision of 4.2% under ideal circumstances was 0.1 ppm. The established approach allowed for the exact and accurate assessment of ascorbic acid in genuine samples of star fruit (Averrhoa carambola L.).

Utilization of Steepest Ascent and Box-Behnken Design for Determination of Gadolinium in Acetonitrile by Differential Pulse Voltammetry Santhy Wyantuti; Uji Pratomo; Yeni Wahyuni Hartati; Amelia Shafira; Ari Hardianto; Husein Hernandi Bahti
Indonesian Journal of Chemistry Vol 23, No 5 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.80979

Gadolinium (Gd) is an important material for advanced technology; hence, the development of a sensitive and efficient alternative for the Gd-detection method to reduce the dependency on complicated and expensive methods has been massively investigated. Furthermore, the combination of differential pulse voltammetry (DPV) and the experimental design to detect Gd provides a simple, effective, and efficient method. In this study, the Steepest Ascent and Box-Behnken designs were chosen to determine the maximum voltammetry responses. The optimum conditions used for this study showed an amplitude modulation of 0.0884 V, potential deposition of 1.4382 V, and deposition time was 60.3615 s with the obtained recovery value, accuracy, and precision values being 98.37, 95.91, and 5.12% in relative standard deviation (RSD), respectively. Meanwhile, the detection and quantization limit values are 3.46 and 11.53 mg/L, respectively. Under optimum conditions, the presence of Gd in acetonitrile is determined in a mixture with Eu and Sm. Based on the results, the DPV method is capable of determining the presence of Gd in acetonitrile.

Pengaruh Jenis Stripping Agent Pada Fasa Internal Menggunakan Metode Emulsion Liquid Membrane Dalam Pemisahan Logam Pengompleks Purba, Anita Zefanya Marchelina; H Bahti, Husen; P Fauzia, Retna; Pratomo, Uji; Wyantuti, Santhy
Al-Kimia Vol 12 No 1 (2024): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v12i1.46271

Heavy metals have a high density, atomic weight, or atomic number. Heavy metals are potentially hazardous to health and the environment and must be separated. Emulsion liquid membrane is a promising technique to remove heavy metal contaminants from industrial and household effluents. Emulsion liquid membrane (ELM) is used to separate heavy metals as it is effective and efficient. ELM involves external, membrane, and internal phases. The internal phase is essential in the separation process as it carries stripping agents to pull metals from the membrane to the internal phase. The choice of stripping agent concentration in the internal phase, such as HNO3, H2SO4, HCl, NaOH, and Na2CO3, affects the extraction efficiency in separating heavying metals using ELM. This article evaluates the effect of stripping agent concentration on extraction efficiency.

Utilization of Green Diluent on the Removal for Heavy Metal Contaminants Using Emulsion Liquid Membrane Kharitas Insani; H Bahti, Husein; Pratomo, Uji; Fauzia, Retna; Santhy Wyantuti; Fajar Firmansyah
Al-Kimia Vol 12 No 1 (2024): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v12i1.46283

Growing industries and human activities have increased the amount of waste containing heavy metals, potentially toxic to human health and the environment. Conventional methods for handling heavy metal wastes have limitations, so the current emerging technique is emulsion liquid membrane (ELM), which is easy and inexpensive and leads to green chemistry. The composition of ELMs generally consists of surfactant, extractant, stripping agent, and diluent. In this article, the focus is on the use of environmentally sustainable diluents derived from vegetable oils. The diluent acts as a solvent for the extractant, helping form a stable emulsion and lowering the emulsion breakage percentage. This article aims to evaluate the potential use of vegetable oils as diluents in the Emulsion Liquid Membrane (ELM) process to improve emulsion stability and heavy metal extraction efficiency.

Comparative Study of Voltammetric Analysis with UV-Vis Spectrophotometry in Determining the Results of Liquid-Liquid Extraction of Samarium (III) Wyantuti, Santhy; Nurwulanda, Salsha; Mardiah, Najmah; Anggraeni, Anni; Pratomo, Uji; Fauzia, Retna Putri; Bahti, Husein H.
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 10, No. 2, November 2024
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v10i2.38941

Rare earth elements (REEs) are garnering significant attention in diverse fields due to their important and fascinating properties. Among these REEs, samarium (Sm) has numerous advantages and benefits. Before using Sm, it must be separated from its natural sources due to the formation of complex compounds with other elements. To achieve this, liquid-liquid extraction emerges as one of the REE separation methods, presenting several advantages, including a streamlined process. Various methods can be used to analyze extraction results, such as ICP-MS and XRF. In comparison, UV-Vis spectrophotometry has significant advantages compared to other methods, it provides a simple approach to determining the level of a substance, and the results given are quite accurate, while differential pulse voltammetry (DPV) is one of the electrochemical analysis methods that is expected to provide faster and accurate analysis results. This study aims to determine the value of analytical parameters, Kd of Sm(III) liquid-liquid extraction results using DPV analysis and UV-Vis spectrophotometry methods. The DPV method yielded LoD 1.24 mg/L, accuracy 98.39%, and %recovery 106.69%. The extraction data obtained Kd Sm values ranging from 6.0019-7.3860. The UV-Vis spectrophotometry results provided an individual extraction efficiency of Sm(III) of 88.54%. This method obtained LoD 0.71 mg/L, accuracy 96.00%, and %recovery 104.00%.

Penentuan Kadar Asam Folat dalam Konjugat Folat Termodifikasi Silan dengan Spektrofotometer UV Sutanto, Cindy Florencia; Rokhmat, Launa Silky Karenindra; Zahra, Sahlaa Alifah; Hardianto, Ari; Wyantuti, Santhy; Fauzia, Retna Putri
Kimia Padjadjaran Vol 3, No 1 (2024)
Publisher : Kimia Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar

Konjugasi asam folat (FA) termodifikasi silan merupakan pendekatan yang banyak digunakan untuk meningkatkan spesifisitas sistem penghantaran obat, terutama dalam menargetkan sel kanker yang mengekspresikan reseptor folat secara berlebih. Dalam penelitian ini, dilakukan sintesis, karakterisasi, dan penentuan kadar FA dalam konjugat aminopropil trimetoksisilana–polietilen glikol–asam folat (APTMS-PEG-FA) menggunakan metode spektrofotometri UV-Vis. Konjugasi dilakukan melalui aktivasi gugus karboksilat FA menggunakan EDC dan NHS, dilanjutkan dengan pengikatan terhadap NH₂-PEG-COOH dan APTMS dalam pelarut DMSO. Karakterisasi UV-Vis menunjukkan puncak serapan khas asam folat pada panjang gelombang 288 nm (π→π*) dan 358 nm (n→π*), mengindikasikan keberhasilan konjugasi. Kurva kalibrasi asam folat dibuat pada rentang konsentrasi 0,002–0,010 mM dengan hubungan linear yang sangat baik (R² = 0,99933). Nilai LOD dan LOQ masing-masing sebesar 0,000270 mM dan 0,000820 mM menunjukkan sensitivitas metode yang tinggi. Berdasarkan kurva ini, kadar FA dalam APTMS-PEG-FA diperoleh sebesar 0,33 ± 0,05 mM. Hasil ini menunjukkan bahwa pendekatan konjugasi yang digunakan efektif dalam menghasilkan konjugat dengan integritas kimia dan kuantitatif yang baik, serta berpotensi untuk digunakan dalam aplikasi biomedis, khususnya dalam sistem penghantaran nanopartikel bertarget untuk terapi dan pencitraan kanker.

Peningkatan Skala Sintesis Nanopartikel Gadolinium dengan Metode Hidrotermal sebagai Senyawa Pengontras MRI: Scaled-up Synthesis of Gadolinium Nanoparticles by Hydrothermal Method as MRI Contrast Agent Rahmani, Azmi Aulia; Fauzia, Retna Putri; Bahti, Husein Hernadi; Wyantuti, Santhy
Jurnal Sains dan Kesehatan Vol. 6 No. 5 (2024): J. Sains Kes.
Publisher : Fakultas Farmasi, Universitas Mulawarman, Samarinda, Indonesia

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Magnetic resonance imaging (MRI) has become one of the most powerful medical imaging techniques in the early diagnosis of diseases to reduce the high mortality of cancer. A contrast agent is required to enhance the contrast between the lesion tissue and healthy tissue. Gadolinium nanoparticles have been a development strategy for gadolinium chelate-based MRI contrast compounds. Nanoparticles offer several advantages such as lower toxicity and high stability, as well as allowing better control of surface properties and dose reduction to enhance contrast in MRI images. This study focuses on the scale-up of gadolinium nanoparticle synthesis by hydrothermal method based on previous optimised results. The gadolinium nanoparticles were coated with PEG polymer for the purpose of colloidal stability and good biocompatibility. The gadolinium nanoparticles shows a spherical with an average hydrodynamic diameter of 11.4 nm. Comprehensive characterisation was conducted to evaluate and confirm gadolinium nanoparticles can be used as candidate MRI contrast agents. Keywords: Contrast Agent, Gadolinium Nanoparticle, PEG, and Scale-up Abstrak Magnetic Resonance Imaging (MRI) menjadi salah satu pencitraan medis yang paling unggul dalam diagnosis dini penyakit guna menekan tingginya mortalitas akibat kanker. Senyawa pengontras diperlukan untuk meningkatkan kontras antara jaringan lesi dan jaringan sehat. Nanopartikel gadolinium telah menjadi strategi pengembangan senyawa pengontras MRI berbasis gadolinium kelat. Nanopartikel menawarkan beberapa keuntungan berupa toksisitas yang lebih rendah dan stabilitas yang tinggi, serta memungkinkan kontrol yang lebih baik terhadap sifat permukaan dan pengurangan dosis untuk meningkatkan kontras pada gambar MRI. Penelitian ini berfokus kepada peningkatan skala sintesis nanopartikel gadolinium dengan metode hidrotermal berdasarkan hasil optimal sebelumnya. Nanopartkel gadolinium dilapisi polimer PEG untuk keperluan stabilitas koloid dan biokompatibilitas yang baik. Nanopartikel gadolinium hasil sintesis berbentuk bulat dengan rata-rata diameter sebesar 11.4 nm. Karakterisasi komprehensif dilakukan untuk mengevaluasi dan memastikan nanopartikel gadolinium dapat digunakan sebagai kandidat senyawa pengontras MRI. Kata Kunci: Senyawa Pengontras, Nanopartikel Gadolinium, PEG, dan Peningkatan Skala

Artikel Review : Polimer Tercetak Ion untuk Pemisahan Logam Tanah Jarang (Sintesis dan Karakterisasi): Review Article: Ion Imprinted Polymers for Separation of Rare Earth Metals (Synthesis and Characterization) Putri, Syelena Prima; Pratomo, Uji; Fauziah, Retna Putri; Bahti, Husein Hernadi; Wyantuti, Santhy
Jurnal Sains dan Kesehatan Vol. 6 No. 5 (2024): J. Sains Kes.
Publisher : Fakultas Farmasi, Universitas Mulawarman, Samarinda, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25026/jsk.v6i5.2324

Rare earth metals (LTJ) are potential prospects that are widely applied in high technology such as cellphones, computer hard disks, solar cells, electric cars, musical instrument components, spacecraft manufacturing, defense industry. The use of REEs relies on their chemical, catalytic, electrical, magnetic and optical properties. In addition, the similar chemical and physical properties of rare earth metals make their separation very difficult and complicated, so appropriate and selective alternative separation methods are needed to obtain pure rare earth metals. One of the separation methods used is solid phase extraction using ion-imprinted polymer (IIP) adsorbents. IIP has the ability to adsorb with high selectivity because it stores the memory effect of the washed template ions. In this review article, an overview of various IIP syntheses for REE separation will be presented. It is hoped that this article can be a reference for research on IIP synthesis, especially for REEs. Keywords: Ion Imprinted Polymer, Rare Earth Metals (REEs), and IIP Synthesis Abstrak Logam tanah jarang (LTJ) merupakan prospek potensial yang banyak diaplikasikan pada teknologi tinggi seperti handphone, hard disk komputer, sel surya, mobil listrik, komponen perangkat alat musik, pembuatan pesawat luar angkasa industri pertahan. Penggunaan LTJ mengandalkan sifat kimia, katalitik, listrik, magnet, dan optiknya. Selain itu, sifat kimia dan fisika yang mirip pada logam tanah jarang membuat pemisahannya sangat sulit dan rumit, maka diperlukan metode pemisahan alternatif yang tepat serta selektif untuk mendapatkan logam tanah jarang yang murni. Salah satu metode pemisahan yang digunakan adalah ekstraksi fase padat menggunakan adsorben polimer tercetak ion (IIP). IIP memiliki kemampuan mengadsorpsi dengan selektivitas tinggi karena menyimpan memory effect dari ion template yang dicuci. Dalam artikel review ini, akan dipaparkan gambaran umum mengenai berbagai sintesis IIP untuk pemisahan LTJ. Artikel ini diharapkan dapat menjadi referensi untuk penelitian mengenai sintesis IIP terutama untuk LTJ. Kata Kunci: Polimer Tercetak Ion, Logam Tanah Jarang (LTJ) dan Sintesis IIP

Comparative Study of Voltammetric Analysis with UV-Vis Spectrophotometry in Determining the Results of Liquid-Liquid Extraction of Samarium (III) Wyantuti, Santhy; Nurwulanda, Salsha; Mardiah, Najmah; Anggraeni, Anni; Pratomo, Uji; Fauzia, Retna Putri; Bahti, Husein H.
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 10, No. 2, November 2024
Publisher : Department of Chemistry, Faculty of Science and Technology Syarif Hidayatullah Jakarta State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v10i2.38941

Rare earth elements (REEs) are garnering significant attention in diverse fields due to their important and fascinating properties. Among these REEs, samarium (Sm) has numerous advantages and benefits. Before using Sm, it must be separated from its natural sources due to the formation of complex compounds with other elements. To achieve this, liquid-liquid extraction emerges as one of the REE separation methods, presenting several advantages, including a streamlined process. Various methods can be used to analyze extraction results, such as ICP-MS and XRF. In comparison, UV-Vis spectrophotometry has significant advantages compared to other methods, it provides a simple approach to determining the level of a substance, and the results given are quite accurate, while differential pulse voltammetry (DPV) is one of the electrochemical analysis methods that is expected to provide faster and accurate analysis results. This study aims to determine the value of analytical parameters, Kd of Sm(III) liquid-liquid extraction results using DPV analysis and UV-Vis spectrophotometry methods. The DPV method yielded LoD 1.24 mg/L, accuracy 98.39%, and %recovery 106.69%. The extraction data obtained Kd Sm values ranging from 6.0019-7.3860. The UV-Vis spectrophotometry results provided an individual extraction efficiency of Sm(III) of 88.54%. This method obtained LoD 0.71 mg/L, accuracy 96.00%, and %recovery 104.00%.

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