Abstract
Polyphenols are used as antioxidants in various foods and beverages, which are considered to be a health benefit. The measurement of polyphenols contents is of great interest in food chemistry and health science. This work reported a microgels based photonic device (etalon) to detect polyphenols. Dopamine was used as a model compound of polyphenols. Herein, we proposed a “block” concept for dopamine detection. The dopamine was oxidized and formed dopamine films catalyzed by tyrosinase on the surface of etalon. As the etalon was immersed in ZnCl2, the dopamine films blocked the ZnCl2 diffusion into etalon that caused optical property changes. The film thickness is associated with the concentration of dopamine which can be readout via optical signals.
Highlights
Polyphenols are strong antioxidants existing in fruits and beverages like tea, red wine, and coffee, which play an important role in human health (Ponder and Hallmann, 2019; Zheng et al, 2020)
Microgels were synthesized by the precipitation polymerization of N-isopropylacrylamide, acrylic acid, N, N′methylene bis
The microgels exhibited the diameters of ∼340 nm (±10 nm) in dried state and diameters of 840 nm (±15 nm) in swelling state at 30°C
Summary
Polyphenols are strong antioxidants existing in fruits and beverages like tea, red wine, and coffee, which play an important role in human health (Ponder and Hallmann, 2019; Zheng et al, 2020). Our group prepared specific microgel-based optical devices (i.e., an etalon). The optical properties of etalon can be described using Eq 1: mλ 2ndcosθ where n is the refractive index of the microgels layer, d is the space between two Au layers, θ is the angle of incident light relative to the normal, and m is the order of reflected peaks that should be integers.
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