A novel bromelain-MnO₂ biosensor for colorimetric determination of dopamine

Abstract

We report a method for determining dopamine in serum via colorimetric sensing. This new method adopts bromelain-templated MnO2 nanosheets that possess high oxidase activity. 3,3',5,5'-Tetramethylbenzidine (TMB) can be directly oxidized...

Time‐Resolved Encryption via a Kinetics‐Tunable Supramolecular Photochromic System

“…Meanwhile, the color of the sample changed from yellow to colorless, showing a kind of negative photochromism. [ 36,37 ] More importantly, the reaction rate of this photodimerization reaction can be modulated by controlling the amount of CB[8] macrocycles in the host–guest systems, in this way, a time‐dimension could be introduced into the process of signal interpretation based on this unique photochromic material. In principle, this time‐involved dynamic strategy is more competitive over those static approaches, because it can extend the data density from sequence level to a matrix level, thereby vastly increasing the capacity of information storage and processing.…”

Nitrocellulose membranes in situ grown with Prussian blue nanoparticles as stable nanozyme pads for colorimetric detection of dopamine

“…S3,† in contrast to the blank, the detection solution in the presence of AA was almost colorless with no apparent absorbance at 650 nm in UV-vis absorption spectra, indicating that AA interfered with the colorimetric detection of DA. 38,49 Interestingly, after the pre-treatment of the AA solution with AAQ-2, the color and absorbance of the detection solution returned to the same level as that of the blank. In addition, upon the usage of AAQ-2, no significant influence was monitored on the colorimetric detection signals of DA (Fig.…”

Dual-emissive phenylalanine dehydrogenase-templated gold nanoclusters as a new highly sensitive label-free ratiometric fluorescent probe: heavy metal ions and thiols measurement with live-cell imaging

“…46,62 Furthermore, the effect of Cys and GSH can be selectively eliminated by using N -ethylmaleimide (NEM) as a thiol-masking agent. 14,63,64…”