Bamboo Activated Carbon-Magnetite as An Adsorbent for the Dispersive Micro-Solid Phase Extraction of Methyl Paraben and Hydroquinone in Skin Care Sample
DOI:
https://doi.org/10.11113/jomalisc.v4.103Keywords:
Bamboo activated carbon-magnetite adsorbent, dispersive micro-solid phase extraction, paraben, hydroquinone, skin careAbstract
This study was performed to investigate the ability of newly synthesized bamboo activated carbon-magnetite (BAC-M) as an adsorbent for dispersive micro-solid phase extraction (D-µ-SPE) of methyl paraben and hydroquinone paraben in skin care sample. The synthesized adsorbent was characterized by Fourier Transform Infrared Spectroscopy (FTIR) and Field Emission Scanning Electron Microscope (FESEM) analysis. Quantification of methyl paraben and hydroquinone was conducted using Gas Chromatography-Flame Ionization Detector (GC-FID). Few parameters of D-µ-SPE were optimized and evaluated such as sample pH, mass adsorbent, extraction time and volume of desorption solvent. The optimum conditions of this method were sample pH 5, 40 mg of adsorbent, 3 min extraction time and 70 µl, and methanol as desorption solvent. The optimized method showed good linearity with R2 of 0.9963 and 0.9978 for methyl paraben and hydroquinone respectively. In addition, the limit of detection (LOD) values were 2.60 mg/L and 2.97 mg/L for methyl paraben and hydroquinone. As for recoveries, both analytes showed satisfying recoveries with 86.5% for methyl paraben and 117% for hydroquinone with relative standard deviation (RSD) < 10%. For the real sample analysis, both analytes were detected as such the amount of methyl paraben was 2.7 mg/L and hydroquinone was 4.56 mg/L, whereby the latter compound was still detected in skin care sample even though its usage has been banned by the Health Ministry of Malaysia.
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