Codeposition of Levodopa and Polyethyleneimine: Reaction Mechanism and Coating Construction

ACS Applied Materials & Interfaces
Shang-Jin YangZhi-Kang Xu

Abstract

Mussel-inspired poly(catecholamine) coatings from polydopamine (PDA) have been widely studied to design functional coatings for various materials. The chemical precursor of dopamine (DA), levodopa (l-DOPA, 3,4-dihydroxyphenyl-l-alanine), is known as the main element of mussel adhesive foot protein, but it is relatively hard to be constructed into a desirable coating on a given material surface under the same conditions as those for DA. Herein, we report a codeposition strategy to achieve the rapid fabrication of mussel-inspired coatings by l-DOPAwith polyethyleneimine (PEI) and to deeply understand the formation mechanism of those aggregates and coatings from l-DOPA/PEI. DFT calculations, fluorescence spectra, nuclear magnetic resonance analysis, and liquid chromatography-tandem mass spectrometry identification demonstrate that the formation of l-DOPA/PEI aggregates is effectively accelerated by PEI crosslinking with those intermediates of oxidized l-DOPA, including l-DOPAquinone and 5,6-dihydroxyindole-2-carboxylic acid as well as 5,6-dihydroxyindole, through Michael-addition and Schiff-base reactions. Therefore, we can facilely control the growth rate and the particle size of the l-DOPA/PEI aggregates in the deposition soluti...Continue Reading

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Citations

Mar 19, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Bing-Pan ZhangLing-Shu Wan
Jun 24, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Hsiu-Wen ChienYu-Ling Lee

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