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. 2014 May 13;4:4950. doi: 10.1038/srep04950

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(a) Colorimetric detection of BSA, bovine collagen-I, cheek tissue and HeLa cells with a red dye in picric acid. (b) Comparison of ELISA and 3,4-DHPAA methods for (i) calibration curve of 0–0.8 μg/ml human collagen-I, and for (ii) detection of cheek tissue in the presence or absence of 0.4 μg/ml human collagen-I. Each bar is the mean ± SD of three repeated experiments.