Icoz, Kutay2025-09-252025-09-2520162076-3417https://doi.org/10.3390/app6100279https://hdl.handle.net/20.500.12573/3973Icoz, Kutay/0000-0002-0947-6166In this paper we report an ultra-low-cost spherical ball lens based cell phone microscopy and image processing algorithms to analyze the amount of immunomagnetic beads on micro-contact printed gratings. The spherical ball lens provides approximately 100x magnification but the recorded images are not clear and are noisy. By using the image-processing algorithms, the noise can be reduced and the images can be enhanced to quantify the amount of immunomagnetic beads on micro-contact printed lines. This method, which is portable and low-cost, can be an alternative read out mechanism for biosensing applications using immunomagnetic beads on micro-contact printed surface receptors. Further, 0.0335 mg/mL was the lowest magnetic bead concentration that could be detected above the inherent noise level of the spherical ball lens.eninfo:eu-repo/semantics/openAccessCell Phone MicroscopyMicro-Contact PrintingImmunomagnetic BeadsImage ProcessingSpherical Ball LensArticle10.3390/app61002792-s2.0-84994246400