Fig. 4
From: Small-volume detection: platform developments for clinically-relevant applications
Paper-based MTT assay schematic for sperm testing. a The mechanism of paper-based MTT assay for sperm testing. There is an abundance of mitochondria in the middle portion of sperm. Succinate dehydrogenase (SDH) within the mitochondria can transform yellow-colored MTT into purple-colored formazon. b The colorimetric results of the strip, which can be interpreted by visual observation or by smartphone-based recording and analytical system. MTT 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide [120]