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• W3208593186 abstract "Colorimetric detection on a microchip frequently suffers the sensitivity problem due to the limited optical path length. Herein, a point-of-care testing (POCT) device based on the colorimetric detection on a microchip with an array of micro through holes for enlarged optical length and an optical imaging system was demonstrated. Each micro through hole has a depth of 2 mm and a volume roughly 0.6 μl, connecting to a microchannel for the efficient reaction. Up to 32 micro through holes were arranged compactly along a round region with a diameter of 13 mm to make them effectively captured by a smartphone camera in a short distance (6.5 cm). For reliable smartphone imaging, a handheld, battery powered optical imaging cassette was made by three-dimensional (3D) printing. A data processing program was also written to realize the detection area selection, RGB (red, green, blue) value reading and detection signal calculation. With the integrated device, a biomarker, human immunodeficiency virus (HIV) p24 antigen in human serum was detected down to 20 pg/ml, much better than that with microchannels. The proposed microchip and the imaging system can be a promising POCT or on-site detection tool based on colorimetric detection. • Micro through hole enlarged optical path length in colorimetric test on a microchip. • Multi-sample test was implemented in the array of micro through holes. • A handheld, battery powered optical imaging cassette was built for smartphone image. • A RGB grab program was programed for RGB value reading and signal calculation. • The combined device had a LOD 20 pg/ml for HIV p24 antigen in human serum." @default.
• W3208593186 created "2021-11-08" @default.
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• W3208593186 date "2022-01-01" @default.
• W3208593186 modified "2023-10-15" @default.
• W3208593186 title "A triple-layer microchannel array chip with micro through-holes for smartphone based point-of-care testing of biomarker" @default.
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• W3208593186 doi "https://doi.org/10.1016/j.snb.2021.130963" @default.
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