Antioxidant potency of highly purified polyepicatechin fractions

Racicot, Kenneth; Favreau, Nicole; Fossey, Stephen A.; Grella, Alexandra R.; Ndou, Tshinanne; Bruno, Ferdinando F.

doi:10.1016/j.foodchem.2011.08.006

Cited by 11 publications

(16 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The C@O (COOA) asymmetric and symmetric stretching were observed at about 1700 and 1410 cm 21 , respectively. The IR peaks that appear at 1600-1550 cm 21 are assigned to C@C of phenolic while the peaks at 1500-1440 cm 21 were assigned to the CAC stretching peaks. The OAH of phenolic bending was assigned to IR peak at 1325 cm 21 .…”

Section: Chemical Characterization By Fourier Transform Infrared Specmentioning

confidence: 99%

“…The IR peaks that appear at 1600-1550 cm 21 are assigned to C@C of phenolic while the peaks at 1500-1440 cm 21 were assigned to the CAC stretching peaks. The OAH of phenolic bending was assigned to IR peak at 1325 cm 21 . For the polymer spectra, a broad peak centered at 3500 cm 21 is again assigned to OAH of phenolic groups.…”

Section: Chemical Characterization By Fourier Transform Infrared Specmentioning

confidence: 99%

“…This OAH stretch has also shifted to higher frequencies relative to the corresponding phenol monomer. The CAOAC linkage in poly(HPA) appears at 1210 cm 21 . This peak is assigned to the asymmetric vibration of the CAOAC linkage.…”

Section: Chemical Characterization By Fourier Transform Infrared Specmentioning

confidence: 99%

“…The first application of enzyme catalysis in the context of polyphenols was in the synthesis of formaldehyde‐free resin . Recently, the applications of polyphenols synthesized using enzyme catalysis has been extended to pharmaceutical and food applications such as polymeric antioxidant food additives and antimicrobials for active packaging . The use of polyphenols have also been reported in electronic, photonic and flame retardant applications .…”

Section: Introductionmentioning

confidence: 99%

“…18,19 Recently, the applications of polyphenols synthesized using enzyme catalysis has been extended to pharmaceutical and food applications such as polymeric antioxidant food additives and antimicrobials for active packaging. 14,20,21 The use of polyphenols have also been reported in electronic, photonic and flame retardant applications. 15,16,[22][23][24] However, there were very few reports of conjugated fluorescent polyphenols synthesized using enzyme.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Facile enzymatic preparation of fluorescent conjugated polymers of phenols and their application in sensing

Kiratitanavit

Bruno

Kumar

et al. 2018

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

The recognized drawback of utilizing metal catalysts for the synthesis of fluorescent conjugated polymers (CP) is the requirement for extensive purification to ensure complete removal of residual catalyst that would otherwise quench the fluorescence. In addition, typical synthesis of fluorescent CP involves multiple steps, monomers and solvents with varying levels of toxicity. This work demonstrates the possibility of utilizing oxidoreductase enzymes as the catalyst, for the one step polymerization of naturally occurring phenols to yield fluorescent conjugated polyphenols. The metal in the active site of the enzyme remains chelated during the synthesis allowing the polymers to be fluorescent as synthesized without the need for extensive purification. Three natural phenols, 4‐hydroxyphenylacetic acid, hydroxytyrosol, and chlorogenic acid were polymerized using Horseradish peroxidase as the biocatalyst. Spectroscopic techniques, UV–vis, Fourier transform infrared Spectroscopy–Attenuated Total Reflectance, and fluorescence, are used to characterize chemical structure and photoluminescence of these polymers. The polyphenols exhibit fluorescence with significant stokes shift in the range 30–100 nm rendering them useful in fluorescence quenching‐based sensors. Preliminary studies on use of these polymers, in the detection of nitro‐aromatic compounds in solution through using fluorescence‐quenching are also presented. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46496.

show abstract

Section: Chemical Characterization By Fourier Transform Infrared Specmentioning

confidence: 99%

Section: Chemical Characterization By Fourier Transform Infrared Specmentioning

confidence: 99%

Section: Chemical Characterization By Fourier Transform Infrared Specmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%