Icoz, Kutay2020-02-052020-02-0520162076-341710.3390/app6100279https://hdl.handle.net/20.500.12573/127The author acknowledges TUBITAK (Project No: 114E886) and AGU BAP (2015-11) for financial support. The author thanks to Cagri Savran and Chun-Li Chang from Purdue University for the fabrication of PDMS stamps and to Omary Mzava and Zehra Tas for the valuable discussions on image processing.In 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.enginfo:eu-repo/semantics/openAccesscell phone microscopymicro-contact printingimmunomagnetic beadsimage processingspherical ball lensarticle10.3390/app6100279