Characterization of the interaction between boscalid and tannic acid and its effect on the antioxidant properties of tannic acid

Abstract

The binding of pesticide residues and fruit components may have a profound impact on pesticide dissipation and the functional characteristics of the corresponding components. Therefore, the interaction between boscalid and tannic acid (TA, a representative phenolic in fruit) was systematically investigated using spectroscopic, thermodynamic, and computational chemistry methods. A separable system was designed to obtain the boscalid-TA complex. Fourier transform infrared and 1 H-NMR spectroscopies indicated the formation of hydrogen bonds in the complex. Isothermal titration calorimetry showed that the complex bound spontaneously through hydrophobic interactions (ΔG < 0, ΔH > 0, ΔS > 0), with a binding constant of 6.0 × 10 5 M −1 at 298 K. The molecular docking results further confirmed the formation of hydrogen bonds and hydrophobic interactions in the complex at the molecular level, with a binding energy of −8.43 kcal mol −1 . In addition, the binding of boscalid to TA significantly decreased the antioxidant activity of TA. The binding of boscalid residue to TA was characterized at the molecular level, which significantly reduced the in vitro antioxidant properties of TA.

4D Printed Poly(l‐lactide)/(FeCl3–TA/MgO) Composite Scaffolds with Near‐Infrared Light‐Induced Shape‐Memory Effect and Antibacterial Properties

“…Although TA itself undergoes oxidation to an intermediate state during this process, it maintains its highly reductive nature and can continue to react with additional DPPH radicals, effectively acting as a scavenger of free radicals. [ 34 ]…”

“…Although TA itself undergoes oxidation to an intermediate state during this process, it maintains its highly reductive nature and can continue to react with additional DPPH radicals, effectively acting as a scavenger of free radicals. [34] The TA and Fe 3þ complex exhibit a high scavenging rate of DPPH radicals and demonstrate excellent antioxidant properties. Consequently, it holds the potential for use as a natural antioxidant supplement to prevent the onset of various diseases.…”