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Introduction: Phenolic compounds are a chemically diverse group of plant secondary metabolites with important roles both in plant stress defence and human nutrition.
Objective: To explore structure-function relations potentiating phenolic compounds to promote leaf acclimation to light stress by excess photosynthetically active radiation (photoinhibition) and by solar ultraviolet (UV) radiation.
Methodology: We report singlet oxygen and hydrogen peroxide antioxidant capacities and UV-absorbing properties of 27 flavonoids and 11 phenolic acids. Correlations of these characteristics in the whole data set and related activity-structure relationships in flavonoid data were investigated using simple statistical methods.
Results: In comparison to flavonoids, phenolic acids are relatively ineffective reactive oxygen neutralising antioxidants; and - with the exception of gallic acid - have poor reactivity to hydrogen peroxide. Singlet oxygen and hydrogen peroxide detoxifying capacities of flavonoids are positively correlated, largely due to the strong positive effect of the hydroxylation of the C-ring in position-3. 3-O-Glycosylation halves reactive oxygen species (ROS) reactivities of quercetin and myricetin but eradicates the hydrogen peroxide reactivity of kaemferol. B-ring polyhydroxylation (cathecol structure) increases the hydrogen peroxide antioxidant function but decreases UV-B (280-315 nm) absorption. UV-A (315-400 nm) absorption is increased by the B-ring C2-C3 double bond either in itself or in combination with the C4 oxo-group.
Conclusion: Among the studied compounds, anthocyanins and flavonols were the strongest singlet oxygen and hydrogen peroxide scavengers, and are thus capable of supporting defence against both photoinhibition by visible light and UV stress in leaves, while flavanols may only be effective against the latter. Copyright © 2017 John Wiley & Sons, Ltd.
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http://dx.doi.org/10.1002/pca.2720 | DOI Listing |
Aging Cell
December 2024
Department of Nanomedicine, Houston Methodist Research Institute, Houston, Texas, USA.
Mesenchymal stem cells (MSCs) are promising candidates for regenerative therapies due to their self-renewal and differentiation capabilities. Pathological microenvironments expose MSCs to senescence-inducing factors such as reactive oxygen species (ROS), resulting in MSC functional decline and loss of stemness. Oxidative stress leads to mitochondrial dysfunction, a hallmark of senescence, and is prevalent in aging tissues characterized by elevated ROS levels.
View Article and Find Full Text PDFHeliyon
December 2024
Department of Advanced General Dentistry, Faculty of Dentistry, Mahidol University, Bangkok, 10400, Thailand.
Objective: The purpose of this study was to examine the effect of several antiseptic mouthwashes on the dentin microtensile bond strength of self-etch adhesive, considering the influence of rinsing with water.
Methods: Forty flat dentin surfaces were produced by sectioning sound extracted third molars. They were randomly divided into four main groups: (1) artificial saliva (control); (2) 1 % hydrogen peroxide; (3) 0.
Biosens Bioelectron
December 2024
School of Medical Science and Technology, Indian Institute of Technology, Kharagpur, 721302, West Bengal, India. Electronic address:
Monitoring HO levels in live cells is essential due to its superior stability and possible severity inside the cell. The quest for a superior platform capable of detecting cellular-level hydrogen peroxide (HO) concentrations without necessitating the use of high-cost enzymes is of utmost importance. Here, the quantification of intracellular HO concentrations has been performed using silver metal polymer-based nonenzymatic electrochemical detection.
View Article and Find Full Text PDFAnal Chem
December 2024
Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, University of Alcalá, E-28802 Madrid, Spain.
Here, we present three-dimensional-printed dual-channel flow-through miniaturized devices (3D) with dual electrochemical detection (ED) integrating two working electrodes each in an in-channel configuration (3D-ED). Prussian Blue (PB) shell-gold nanoparticles ((PB)AuNP) core-based electrochemistry was chosen for selective hydrogen peroxide determination. 3D-ED devices exhibited impress stability, identical intrachannel and interchannel electrochemical performances, and excellent interdevice precision with values under 9%, revealing the reliability of the design and fabrication of the devices.
View Article and Find Full Text PDFEur J Pharm Biopharm
December 2024
ten23 health AG, Mattenstr. 22, 4058 Basel, Switzerland; Institute of Pharmaceutical Sciences, Department of Pharmaceutics, University of Freiburg, Sonnenstr. 5, 79104 Freiburg, Germany. Electronic address:
Aseptic filling of biopharmaceutical products requires a grade A cleanroom environment, preferably ensured by isolators in grade C surroundings. Isolators are decontaminated before the start of filling processes using vaporized hydrogen peroxide (VHP) and filling starts at pre-defined residual VHP levels (e.g.
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