Optimisation of a gold nanoparticle-based aptasensor integrated with image processing for the colorimetric detection of acephate using response surface methodology
| Autor: | Teoh Chin Chuang, Victor Feizal Knight, Noor Azilah Mohd Kasim, Mohd Junaedy Osman, Siti Aminah Mohd Noor, Wan Md Zin Wan Yunus, Jahwarhar Izuan Abdul Rashid, Ong Keat Khim |
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| Rok vydání: | 2021 |
| Předmět: |
Detection limit
Chromatography Central composite design Magnesium General Chemical Engineering Aptamer chemistry.chemical_element Nanoparticle Image processing 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Response surface methodology 0210 nano-technology Acephate |
| Zdroj: | RSC Advances. 11:25933-25942 |
| ISSN: | 2046-2069 |
| Popis: | Acephate (Ac) is an organophosphate (OP) compound, which is able to inhibit the activity of acetylcholinesterase. Thus, the aim of this study was to optimize the detection of Ac using a thiolated acephate binding aptamer-citrate capped gold nanoparticle (TABA–Cit-AuNP) sensor that also incorporated an image processing technique. The effects of independent variables, such as the incubation period of TABA–Cit-AuNPs (3–24 h) for binding TABA to Cit-AuNPs, the concentration of phosphate buffer saline (PBS) (0.001–0.01 M), the concentration of thiolated acephate binding aptamer (TABA) (50–200 nM), and the concentration of magnesium sulphate (MgSO4) (1–300 mM) were investigated. A quadratic model was developed using a central composite design (CCD) from response surface methodology (RSM) to predict the sensing response to Ac. The optimum conditions such as the concentration of PBS (0.01 M), the concentration of TABA (200 nM), the incubation period of TABA–Cit-AuNPs (3 h), and the concentration of MgSO4 (1 mM) were used to produce a TABA–Cit-AuNPs sensor for the detection of Ac. Under optimal conditions, this sensor showed a detection ranging from 0.01 to 2.73 μM and a limit of detection (LOD) of 0.06 μM. Real sample analysis demonstrated this aptasensor as a good analytical method to detect Ac. |
| Databáze: | OpenAIRE |
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