N, S-co-doped carbon/Co1-xS nanocomposite with dual-enzyme activities for a smartphone-based colorimetric assay of total cholesterol in human serum

A field-deployable water quality monitoring with machine learning-based smartphone colorimetry

“…19 A common approach in colorimetric analysis to use a calibration curve. [20][21][22]25 However, the calibration curve performs better only in a controlled environment. The change in conditions may cause a deviation in the results as the equation derived from the calibration curve is conditiondependent like illumination and camera sensors.…”

“…17 Most oen used smartphone applications rely on digital image colorimetry and image analysis. 18 In this way, the use of smartphones as chemical detectors is becoming widespread in various elds such as medicine, [19][20][21][22] food, 23,24 and environment. 25,26 Hossain et al presented a "lab-in-a-phone" platform with a pH sensor concept to detect any possible contamination in drinking waters.…”

Colorimetric detection of Hg2+ based on the enhanced oxidase-mimic activity of CuO/Au@Cu3(BTC)2 triggered by Hg2+

“…23,24 Generally, Hg 2+ can either enhance or inhibit the enzyme-mimetic activities of nanozymes and make it realize the colorimetric detection of Hg 2+ based on the 3,3,5,5-tetramethylbenzidine (TMB) chromogenic system. 25–29 One way to design the colorimetric strategy for Hg 2+ detection is based on the robust interaction between Hg and S (or Se). 25–27 Liu et al , using an N, S co-doped carbon-Co 6 Ni 3 S 8 nanocomposite (NSC/Co 6 Ni 3 S 8 ) as an oxidase-like nanozyme, developed a smartphone-based colorimetric sensor for Hg 2+ detection.…”

“…25–29 One way to design the colorimetric strategy for Hg 2+ detection is based on the robust interaction between Hg and S (or Se). 25–27 Liu et al , using an N, S co-doped carbon-Co 6 Ni 3 S 8 nanocomposite (NSC/Co 6 Ni 3 S 8 ) as an oxidase-like nanozyme, developed a smartphone-based colorimetric sensor for Hg 2+ detection. 25 Hg 2+ served as a trigger center by forming HgS on the nanozyme, which led to an enhanced oxidase-like activity in this colorimetric system.…”

“…25–27 Liu et al , using an N, S co-doped carbon-Co 6 Ni 3 S 8 nanocomposite (NSC/Co 6 Ni 3 S 8 ) as an oxidase-like nanozyme, developed a smartphone-based colorimetric sensor for Hg 2+ detection. 25 Hg 2+ served as a trigger center by forming HgS on the nanozyme, which led to an enhanced oxidase-like activity in this colorimetric system. Similarly, Luo et al designed a colorimetric platform for Hg 2+ detection based on the Hg 2+ -triggered oxidase-like activity of NiSe 2 .…”