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All Journal Jurnal Riset Kimia Science and Technology Indonesia
Anang Sedyohutomo
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Environmental Science Materials Science & Nanotechnology Physics

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DETERMINATION OF CYCLODEXTRINS BY CAPILLARY LIQUID CHROMATOGRAPHY WITH INDIRECT CONDUCTIMETRIC DETECTION Toyohide Takeuchi; Anang Sedyohutomo; Lee Wah Lim
Jurnal Riset Kimia Vol. 4 No. 1 (2010): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v4i1.112

Abstract

   ABSTRACT Cyclodextrins (CDs) contained in a bottled Japanese tea and a wasabi (Japanese horseradish) paste were determined by capillary liquid chromatography (LC) with indirect conductimetric detection based on dilution of the mobile phase due to the analytes. High electrical conductivity background was maintained by addition of 5 mM sodium nitrate in the mobile phase, and the analytes were visualized by decreases in the background when they eluted. The dynamic reserve, defined as the ratio of the background to its noise level, achieved under the present conditions was 1.7×105, which was much larger than that achieved by UV absorption detection. This means that indirect conductimetric detection gave better sensitivity than indirect UV absorption detection. A capacitively coupled contactless conductivity detector was convenient to monitor the effluents from capillary columns with minimum extra-column band broadening. The signals as negative peaks were linear to the concentration of the analytes, and the concentration detection limits achieved at S/N=3 were 0.02, 0.05 and 0.02% (w/v) for α-, β- and γ-CD, respectively, corresponding to the mass detection limits of 30-75 ng for 0.15 μL injection. The present detection method is not selective but universal, and it is useful in capillary LC when analytes have neither chromophore nor fluorophore groups. Keywords: Capillary liquid chromatography, Indirect conductimetric detection, Capacitively coupled contactless conductivity detector, Cyclodextrins
Ion Chromatographic Analysis of Major Electrolyte Cations in Sappan Wood Extract (Caesalpinia sappan L.) Amin, Muhammad; Sedyohutomo, Anang; Amin, Nahdiah; Ibrahim, Abu Rahmat; Mauraji, Ilham
Science and Technology Indonesia Vol. 10 No. 1 (2025): January
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.2025.10.1.212-220

Abstract

Using ion chromatography, a convenient method for analyzing major electrolyte cations (lithium, sodium, ammonium, potassium, magnesium, calcium, strontium, and barium) was presented and applied to Sappan wood samples. The analysis used a Metrohm C4-150/4.0 column with nitric acid (HNO3) as the eluent. Optimal separation was achieved with an eluent flow rate of 0.8 mL/min, resulting in excellent peak resolution and complete separation within 20 min. Calibration curves for all targeted cations were established within the 0.5 to 20.0 mg/L concentration range, demonstrating strong linearity with correlation coefficients (R2) greater than 0.999, ensuring accurate and reliable analysis. The Sappan wood samples were obtained from Ternate City, North Maluku, where cation concentrations were varied based on the extraction method. Boiling the sappan wood samples, as compared to soaking in hot purified water, significantly increased the release of electrolyte cations, resulting in higher concentrations and a greater variety of cations. Calcium was the most abundant cations in each extraction method, with a concentration of 37.80 mg/kg (5 min soaking), 43.92 mg/kg (10 min soaking), and 83.73 mg/kg (10 min boiling). In contrast, the concentration of three electrolyte cations: lithium, strontium, and barium, was below the instrument’s detection limit in all the samples.
Co-Authors Amin, Nahdiah Ibrahim Rahmat Lee Wah Lim Mauraji, Ilham Muhammad Amin Toyohide Takeuchi