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Multichannel lens‐free CMOS sensors for real‐time monitoring of cell growth

A low‐cost platform is proposed for the growth and real‐time monitoring of biological cells. The main components of the platform include a PMMA cell culture microchip and a multichannel lens‐free CMOS (complementary metal‐oxide‐semiconductor) / LED imaging system. The PMMA microchip comprises a three‐layer structure and is fabricated using a low‐cost CO2 laser ablation technique. The CMOS / LED monitoring system is controlled using a self‐written LabVIEW program. The platform has overall dimensions of just 130 × 104 × 115 mm3 and can therefore be placed within a commercial incubator. The feasibility of the proposed system is demonstrated using HepG2 cancer cell samples with concentrations of 5000, 10 000, 20 000, and 40 000 cells/mL. In addition, cell cytotoxicity tests are performed using 8, 16, and 32 mM cyclophosphamide. For all of the experiments, the cell growth is observed over a period of 48 h. The cell growth rate is found to vary in the range of 44∼52% under normal conditions and from 17.4∼34.5% under cyclophosphamide‐treated conditions. In general, the results confirm the long‐term cell growth and real‐time monitoring ability of the proposed system. Moreover, the magnification provided by the lens‐free CMOS / LED observation system is around 40× that provided by a traditional microscope. Consequently, the proposed system has significant potential for long‐term cell proliferation and cytotoxicity evaluation investigations.