2012 ©
Journal Publication
Title of Article Fe3O4/hydroxyapatite/graphene quantum dots as a novel nano-sorbent for preconcentration of copper residue in Thai food ingredients: Optimization of ultrasound-assisted magnetic solid phase extraction 
Date of Acceptance 28 December 2017 
     Title of Journal Ultrasonics Sonochemistry 
     Standard ISI 
     Institute of Journal elsevier 
     ISBN/ISSN 1350-4177 
     Volume 2017 
     Issue 37 
     Year of Publication 2017 
     Page 83-93 
     Abstract Fe3O4/hydroxyapatite/graphene quantum dots (Fe3O4/HAP/GQDs) nanocomposite was synthesized and used as a novel magnetic adsorbent. This nanocomposite was characterized using scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, energy dispersive X-ray spectroscopy, and magnetization property. The Fe3O4/HAP/GQDs was applied to pre-concentrate copper residues in Thai food ingredients (so-called ‘‘Tom Yum Kung”) prior to determination by inductively coupled plasma-atomic emission spectrometry. Based on ultrasoundassisted extraction optimization, various parameters affecting the magnetic solid-phase extraction, such as solution pH, amount of magnetic nanoparticles, adsorption and desorption time, and type of elution solvent and its concentration were evaluated. Under optimal conditions, the linear range was 0.05– 1500 ng mL1 (R2 > 0.999), limit of detection was 0.58 ng mL1, and limit of quantification was 1.94 ng mL1. The precision, expressed as the relative standard deviation of the calibration curve slope (n = 5), for intra-day and inter-day analyses was 0.87% and 4.47%, respectively. The recovery study of Cu for real samples was ranged between 83.5% and 104.8%. This approach gave the enrichment factor of 39.2, which guarantees trace analysis of Cu residues. Therefore, Fe3O4/HAP/GQDs can be a potential and suitable candidate for the pre-concentration and separation of Cu from food samples. It can easily be reused after treatment with deionized water. 
     Keyword Ultrasound-assisted extraction, Magnetic solid-phase extraction, Copper, Hydroxyapatite, Graphene quantum dots, Nanocomposite 
577020058-8 Mr. PHITCHAN SRICHAROEN [Main Author]
Science Doctoral Degree
Science Doctoral Degree
575020033-0 Miss YONRAPACH AREEROB
Science Master's Degree
Science Doctoral Degree

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Level of Publication นานาชาติ 
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