Designing paper biosensors to the colorimetric measurement of bisphenol A by using gold nanoparticles modified with aptamer

Different methods for measuring bisphenol A have been reported, which are often expensive and require professional knowledge. The first approach is to provide a low-cost method for measuring bisphenol A by available devices [1]. aptamer and gold nanoparticles are interconnected. A specific concentration of NaCl being addedto the obtained red solution [2]. Then the red solution is dropped on the hydrophobic paper and the image is recorded by the scanner. In the next step, the bisphenol Asolution is added to it and the color changes from red to blue. scaning is being done again and color analysis is performed by adobe Photoshop software. The color intensity will be proportional to the concentration of bisphenol A. The limit of visual detection (LOD) was found to 0.23 ng/L by photoshop software analysis. This is a new method for measuring bisphenol A in which Wattman paper is used as a reaction bed. And the available software such as adobe Photoshop and computer is used to quantitatively and quantitatively measure bisphenol by colorimetry. This method is able to measure bisphenol A at 1ppt level quantitatively and shows it s sensitive. This is an efficient method for measuring bisphenol A in water samples