Polyphenol tannic acid inhibits hydroxyl radical formation from Fenton reaction by complexing ferrous ions1This study is dedicated to the memory of Botany Professor Luiz F.G. Labouriau (1921–1996).1

Lopes, George K.B.; Schulman, Herbert M.; Hermes‐Lima, Marcelo

doi:10.1016/s0304-4165(99)00117-8

Cited by 419 publications

(109 citation statements)

References 37 publications

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“…Hydrogen bonding between the hydroxyl groups of TA and the carbonyl groups of PVPON preserve cell integrity and function under deposition conditions. [54,[82][83][84] The successful formation of shells around cells was confirmed by confocal microscopy (Figure 2). Figure 2a demonstrates large scale confocal image of encapsulated yeast cells with fluorescently labeled PVPON (PVPON-coAlexa Fluor 532) and Figure 2b shows the same area in transmission optical mode, confirming that all the cells visible in the selected area have been uniformly coated with labeled LbL shells.…”

Section: Morphology Of Lbl Shellsmentioning

confidence: 75%

Truly Nonionic Polymer Shells for the Encapsulation of Living Cells

Carter

Drachuk

Harbaugh

et al. 2011

Macromolecular Bioscience

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Engineering surfaces of living cells with natural or synthetic compounds can mediate intercellular communication and provide a protective barrier from hostile agents. We report on truly nonionic hydrogen-bonded LbL coatings for cell surface engineering. These ultrathin, highly permeable polymer membranes are constructed on living cells without the cationic component typically employed to increase the stability of LbL coatings. Without the cytotoxic cationic PEI pre-layer, the viability of encapsulated cells drastically increases to 94%, in contrast to 20% viability in electrostatically-bonded LbL shells. Moreover, the long-term growth of encapsulated cells is not affected, thus facilitating efficient function of protected cells in hostile environment.

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Section: Morphology Of Lbl Shellsmentioning

confidence: 75%

Truly Nonionic Polymer Shells for the Encapsulation of Living Cells

Carter

Drachuk

Harbaugh

et al. 2011

Macromolecular Bioscience

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“…For example, the reaction time between hydroxyl radical and target molecule depends on the half-life time of the generated free radical. According to evidences, for concentrations of H 2 O 2 or Fe(II) <0.1 mM, the Fenton reaction might finish within 1 s (Lopes et al, 1999).…”

Section: Detection Of Dna Bases Damagementioning

confidence: 99%

Electrochemical determination of antioxidant capacities in flavored waters by guanine and adenine biosensors

Kamel

Moreira

Delerue–Matos

et al. 2008

Biosensors and Bioelectronics

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a b s t r a c tThe immobilization and electro-oxidation of guanine and adenine as DNA bases on glassy carbon electrode are evaluated by square wave voltammetric analysis. The influence of electrochemical pretreatments, nature of supporting electrolyte, pH, accumulation time and composition of DNA nucleotides on the immobilization effect and the electrochemical mechanism are discussed. Trace levels of either guanine or adenine can be readily detected following short accumulation time with detection limits of 35 and 40 ng mL −1 for guanine and adenine, respectively. The biosensors of guanine and adenine were employed for the voltammetric detection of antioxidant capacity in flavored water samples. The method relies on monitoring the changes of the intrinsic anodic response of the surface-confined guanine and adenine species, resulting from its interaction with free radicals from Fenton-type reaction in absence and presence of antioxidant. Ascorbic acid was used as standard to evaluate antioxidant capacities of samples. Analytical data was compared with that of FRAP method.

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“…Stock solutions of 2-deoxyribose (25 mM) and phosphate buffer 10 mM (pH 7.4) were prepared and kept in a cold room at 4-6 °C. Stock solution of EDTA (10 mM) was prepared at pH 7.0 according to the methods of Lopes et al 36 and kept at room temperature. Fresh aqueous stock solution of 10 mM FeCl3, 2 mM H2O2 and 0.5 mM ascorbic acid was prepared daily.…”

Section: Molecular Modellingmentioning

confidence: 99%

2,4-Furfurylidene-D-sorbitol and its tetra-methyl ether: synthesis, conformational studies, and radical scavenging activity

Ciuffreda¹,

Brizzolari²,

Casati³

et al. 2016

Arkivoc

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The structure of 1-[2-(furan-2-yl)-5-hydroxy-6-(hydroxymethyl)-1,3-dioxan-4-yl]ethane-1,2-diol] (2,4-furfurylidene-D-sorbitol) and its tetra-methyl ether was established by a detailed NMR analysis. The conformational structure for both compounds was confirmed by in silico studies based both on Density Functional Theory (DFT) and on classical molecular dynamics approaches. The scavenging activity against hydroxyl radicals (•OH) of compounds was established by the 2-deoxyribose degradation assay.

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Polyphenol tannic acid inhibits hydroxyl radical formation from Fenton reaction by complexing ferrous ions1This study is dedicated to the memory of Botany Professor Luiz F.G. Labouriau (1921–1996).1

Cited by 419 publications

References 37 publications

Truly Nonionic Polymer Shells for the Encapsulation of Living Cells

Truly Nonionic Polymer Shells for the Encapsulation of Living Cells

Electrochemical determination of antioxidant capacities in flavored waters by guanine and adenine biosensors

2,4-Furfurylidene-D-sorbitol and its tetra-methyl ether: synthesis, conformational studies, and radical scavenging activity

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