Bioactive Phytophenolics and Antioxidant Functions of Aqueous and Organic Tea Extracts

Bahorun, Theeshan; Neergheen-Bhujun, Vidushi S.; Toolsee, Naushad A.; Somanah, Jhoti; Luximon-Ramma, Amitabye; Aruoma, Okezie I.

doi:10.1016/b978-0-12-384937-3.00030-6

Tea in Health and Disease Prevention 2013

DOI: 10.1016/b978-0-12-384937-3.00030-6

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Bioactive Phytophenolics and Antioxidant Functions of Aqueous and Organic Tea Extracts

Theeshan Bahorun

Vidushi S. Neergheen-Bhujun

Naushad A. Toolsee

et al.

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Cited by 5 publications

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“…Additionally, our coatings display one of the most celebrated features of plant polyphenols: the ability to scavenge radical and non-radical reactive oxygen species (ROS). [ 13 ] We examined the antioxidant properties of polyphenol-coated fumed silica (FS) nanoparticles and flat tissue culture polystyrene (TCPS) surfaces, using both chemical and cell-based assays. Radical scavenging properties were assessed using a stable radical assay based on 2,2-diphenyl-1-picrylhydrazyl (DPPH; Figure S19 ), and antioxidant behavior was probed through β-carotene degradation (Figure 3 D ).…”

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Colorless Multifunctional Coatings Inspired by Polyphenols Found in Tea, Chocolate, and Wine

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Polyphenolic compounds present in tea, red wine, and chocolate form thin adherent polyphenol films on substrates through spontaneous adsorption from solution. From this observation emerged a versatile and comprehensive approach to surface modification of a variety of solid, porous, and nanoparticulate substrates composed of metals, ceramics, and polymers (see picture; ROS=reactive oxygen species).

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Colorless Multifunctional Coatings Inspired by Polyphenols Found in Tea, Chocolate, and Wine

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Water‐Triggered Self‐Healing Coatings of Hydrogen‐Bonded Complexes for High Binding Affinity and Antioxidative Property

Qiu

et al. 2016

Adv Materials Inter

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stimuli, such as UV-vis light irradiation, [ 18,19 ] heating, [ 20,21 ] or special chemical environments, [ 22,23 ] are required to trigger the healing process because the substance migration of coatings is hindered by the substrates. [ 26 ] Among intrinsic self-healing coatings, water-enabled self-healing coatings are especially promising because the healing is accomplished by simply soaking the coatings in water or exposing them to moisture, [27][28][29][30][31][32][33][34][35][36] without using any special devices or chemicals. Lyon and co-workers [ 25,36 ] fi rst developed hydrogel thin fi lms/coatings on polydimethylsiloxane by layer-by-layer (LBL) assembly of submicrometer-sized polyanionic gel particles and linear polycations; these fi lms can rapidly heal micrometer-sized defects after exposed to water. Subsequently, Sun and co-workers have fabricated various kinds of water-enabled self-healing coatings by LBL assembly of polyelectrolyte multilayers. [ 11,[27][28][29][30] Up to now, all water-enabled self-healing coatings are prepared by LBL assembly. [ 11,[24][25][26][27][28][29][30][31][32][33][34][35][36] This method is advantageous in easy preparation and fi ne control over the coating structures. However, pretreatment of the substrates is usually needed for the subsequent LBL assembly; the resulting coatings cannot bind tightly to different materials. In addition, it is time-consuming especially in fabricating micrometer-thick coatings which are required for effi cient healing of severe damages [ 27 ] and compensation for the lost substance in the coatings. [ 30 ] Therefore, it is desirable to develop a universal approach with high time and cost effi ciency to fabricate mechanically robust water-enabled self-healing coatings on a wide range of substrates.Here we report a versatile yet facile method to fabricate waterenabled self-healing coatings on various substrates, by precipitating hydrogen-bonded complexes of tannic acid (TA) and polyethylene glycol (PEG) in aqueous solution. TA, a natural polyphenol, endows the coatings with high binding affi nity to different substrates [37][38][39][40][41][42][43] and antioxidant capacities. [ 38,46 ] TAs associate with PEGs into stable micrometer-sized complexes through intermolecular hydrogen bond in neutral or acidic aqueous solution. [ 44,45 ] With addition of NaCl, these complexes rapidly precipitate onto substrates under gravity and coalesce with each other to generate uniform soft coatings via hydrogen bonding. After drying, the hydrogen-bonding will be enhanced to produce mechanically robust coatings with strong adhesion to different substrates. However, the coatings become soft and Recent years have witnessed the rapid developments of self-healing coatings because they can protect materials from diverse risks and are able to autonomously heal after being physically damaged. Here, a universal yet facile method is reported with high time and cost effi ciency to fabricate transparent water-enabled self-healing coatings on various substrates by precipitat...

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Colorless Multifunctional Coatings Inspired by Polyphenols Found in Tea, Chocolate, and Wine

et al. 2013

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Polyphenolverbindungen, die in Tee, Rotwein und Schokolade vorkommen, bilden auf Trägermaterialien dünne haftende Polyphenolfilme durch spontane Adsorption aus einer Lösung. Auf der Grundlage dieser Beobachtung wurde ein allgemein anwendbarer Prozess zur Oberflächenmodifizierung von festen, porösen und nanopartikulären Metall‐, Keramik‐ und Polymermaterialien entwickelt (siehe Bild; ROS=reaktive Sauerstoffspezies).

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Bioactive Phytophenolics and Antioxidant Functions of Aqueous and Organic Tea Extracts

Cited by 5 publications

References 49 publications

Colorless Multifunctional Coatings Inspired by Polyphenols Found in Tea, Chocolate, and Wine

Colorless Multifunctional Coatings Inspired by Polyphenols Found in Tea, Chocolate, and Wine

Water‐Triggered Self‐Healing Coatings of Hydrogen‐Bonded Complexes for High Binding Affinity and Antioxidative Property

Colorless Multifunctional Coatings Inspired by Polyphenols Found in Tea, Chocolate, and Wine

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