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All Journal Molekul: Jurnal Ilmiah Kimia Jurnal Ilmiah Berkala Sains dan Terapan Kimia
Andi Hairil Alimuddin
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry

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Colorimetric Detection of Hg(II) Ion Using Silver Nanoparticles Capped with 3-Hydroxybenzoic Acid Gusrizal Gusrizal; Andi Hairil Alimuddin; Ajuk Sapar; Rizki Noviani Ridwan; Sri Juari Santosa
Molekul Vol 14, No 1 (2019)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (370.928 KB) | DOI: 10.20884/1.jm.2019.14.1.460

Abstract

In this paper, we report for the first time thesimple method for detection of Hg(II) ion in anaqueousmedium using silver nanoparticles capped with 3-hydroxybenzoic acid. Silver nanoparticles capped with 3-hydroxybenzoic acid were preparedby reduction of the silver ion with 3-hydroxybenzoic acid and without surface functionalization. The formation of silver nanoparticles was characterized by a UV-Visible spectrophotometer. The yellowcolloid of prepared silver nanoparticles capped with 3-hydroxybenzoic acid showed a surface plasmon resonance peak at 420 nm. The ability of silver nanoparticles capped with 3-hydroxybenzoic acid in detection was tested by doing a reaction with several metal ions individually(Na(I), K(I), Cu(II), Zn(II), Ca(II), Mg(II), Hg(II), Mn(II), Ni(II), Pb(II), and Co(II)). It was foundthat silver nanoparticles capped with 3-hydroxybenzoic acid highly selective toHg(II) and then the prepared silver nanoparticles were developedfor detection of Hg(II) ion. Addition of 1 mL Hg(II) ion into 4mL the as-preparedsilver nanoparticles reducedthe peak of surface plasmon resonance spectra, andthe reduction of peak intensity was proportional to the concentration of Hg(II) ion. A goodlinear relationship (R2= 0.998) between absorbance at 420 nm and concentrationof Hg(II) over the range 1.0x10-3to 5.5x10-3M was obtained. Silver nanoparticles capped with 3-hydroxybenzoic acid were highly sensitive to Hg (II) ion with the detection limit down to 4.7x10-5M. Application the method to the real water sample showed the excellentresult with recovery ranged from 98 to 101%. The proposed method was found to be useful forthe colorimetric detection of Hg(II) ion in an aqueousmedium.
CHARACTERIZATION OF NON-POLAR ORGANIC COMPOUNDS FROM Padina minor MACROALGAE FROM SINGKAWANG WATERS AND ANTIBACTERIAL ACTIVITY AGAINST Staphylococcus aureus AND Escherichia coli Fina Rika Wardani; Ajuk Sapar; Andi Hairil Alimuddin
Jurnal Sains dan Terapan Kimia Vol 18, No 1 (2024)
Publisher : Jurnal Ilmiah Berkala Sains dan Terapan Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jstk.v18i1.15618

Abstract

Characterization of nonpolar organic compounds of macroalga Padina minor from Singkawang waters and activity against Staphylococcus aureus and Escherichia coli bacteria has been carried out. The stages of this research consisted of maceration, fractionation, phytochemical tests, characterization using FTIR and GC-MS, as well as testing the antibacterial activity with the well-diffusion method. The fractionation process produces n-hexane, dichloromethane, and methanol fractions. The n-hexane fraction was selected for packaging using gradient n-hexane: dichloromethane eluent and yielded 11 combined fractions (F1RW1-F1RW11). The combined fraction F1RW2 was separated again using n-hexane: dichloromethane eluent in a gradient manner and 18 combined fractions (F2RW1-F2RW18) were obtained. Then the F2RW4 isolate was characterized for GC-MS characterization and the F2RW3 isolate was characterized using FTIR. The FTIR interpretation results show the absorption of hydroxyl groups O-H (345.65 cm-1), C=O (1743.65 cm-1), C=C bonds (1633.71 cm-1), C-H (2926.01; 2854.01, 1438.9 and 723.31 cm-1), and C-O-C bonds (1170.79 cm-1). The results of the GC-MS analysis showed that the F2RW4 fraction had 2 main compounds, namely methyl decanoate and 11-methyl octadecenoate. The results of the antibacterial activity test showed that the methanol extract and n-hexane fraction of Padina minor were inactive against the inhibiting bacteria Staphylococcus aureus and Escherichia coli. Keywords:  Padina minor, FTIR, GC-MS, Antibacterial
Co-Authors Ajuk Sapar Ajuk Sapar Fina Rika Wardani Gusrizal Gusrizal Rizki Noviani Ridwan Sri Juari Santosa