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A glucose sensor demonstrator using the microfluidic device. Photographs of one microfluidic sensor a) soon after assembly, b) 2 min, c) 4 min, and d) 6 min after adding glucose solution, and e) after adding sulfuric acid. Two upper pads had a higher dye concentration (3 g L−1) while the lower pads and the left end pad have lower dye concentration (0.75 g L−1).
