scholarly journals Singlet Oxygen Production by PSII Under Light Stress: Mechanism, Detection and the Protective role of β-Carotene

2014 ◽  
Vol 55 (7) ◽  
pp. 1216-1223 ◽  
Author(s):  
Alison Telfer
Keyword(s):  
Singlet Oxygen ◽  
Light Stress ◽  
Protective Role ◽  
Oxygen Production ◽  
Β Carotene

Protective role of β-carotene against oxidative stress and neuroinflammation in a rat model of spinal cord injury

2018 ◽  
Vol 61 ◽  
pp. 92-99 ◽  
Author(s):  
Lihui Zhou ◽  
Lian Ouyang ◽  
Shuangzhi Lin ◽  
Song Chen ◽  
YingJie Liu ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Spinal Cord ◽  
Spinal Cord Injury ◽  
Rat Model ◽  
Protective Role ◽  
Cord Injury ◽  
Β Carotene

scholarly journals Oxidative stress induced by tBHP in human normal colon cells by label free Raman spectroscopy and imaging: The protective role of natural antioxidants in the form of β-carotene

2021 ◽  
Author(s):  
B. Brozek-Pluska ◽  
K. Beton
Keyword(s):  
Oxidative Stress ◽  
Human Colon ◽  
Protective Role ◽  
Control Group ◽  
Label Free ◽  
Normal Colon ◽  
Stress Injury ◽  
Colon Cells ◽  
Β Carotene

AbstractThe present study aimed to investigate the protective effect of β-carotene on the oxidative stress injury of human normal colon cell line CCD-18Co triggered by tert-Butyl hydroperoxide (tBHP). XTT examination was used to determine cell viability after β-carotene supplementation and to determine the optimal concentration of antioxidant in spectroscopic studies. Cell biochemistry for CCD-18Co control group, after tBHP adding and for cells in β-carotene - tBHP model was studied by using label-free Raman microspectroscopy. Results for stress treated CCD-18Co human colon normal cells and human colon cancer cells Caco-2 based on vibration features were also compared. Pretreatment with β-carotene alleviated damages in CCD-18Co human normal colon cells induced by tBHP and showed the preventative effect on cells apoptosis. Treatment with β-carotene altered the level of ROS investigated based on intensities of Raman peaks typical for lipids, proteins and nucleic acids. Presented study confirmed the antioxidant, protective role of β-carotene against ROS by using spectroscopic label-free Raman techniques.

The significance of carotenoids and tocopherols in photoprotection of seven epiphytic fern species of a Mexican cloud forest

2001 ◽  
Vol 28 (8) ◽  
pp. 775 ◽  
Author(s):  
Michael Tausz ◽  
Peter Hietz ◽  
Oscar Briones
Keyword(s):  
Drought Stress ◽  
Life Form ◽  
Light Exposure ◽  
Cloud Forest ◽  
Light Stress ◽  
Rapid Changes ◽  
Fern Species ◽  
Epiphytic Fern ◽  
Β Carotene

Epiphytes experience frequent and rapid changes in water availability andlight intensity. The role of carotenoids and tocopherols in photoprotection ofseven fern species (Asplenium cuspidatum Lam.,Phlebodium areolatum (HB ex Willd.) Smith,Polypodium puberulum Schl. & Cham.,Po. plebeium Schl. & Cham.,Elaphoglossum glaucum Moode,E. petiolatum (Sw.) Urb., andPleopeltis mexicana (Fée) Mickel & Beitel)with different adaptations against drought were investigated. The plants weresampled dark adapted (treatment I), and after light exposure with thesubstrate present (treatment II), with the substrate removed (treatment III)and with substrate and rhizomes removed (treatment IV) to induce increasing degrees of drought stress. The degree of dehydration reached does not resultin permanent damage and was also observed in the field. While none of thetreatments induced significant chlorophyll (chl) degradation, all plantsshowed strong de-epoxidation of the xanthophyll cycle on light exposure (up toa de-epoxidation state of 70%), but without an additional effect ofdesiccation. Most species showed a rapid increase (within hours) ofcarotenoids (mainly β-carotene and lutein) and α-tocopherol onexposure. In A. cuspidatum, a species with no apparentadaptations to drought, drought stress in combination with light resulted inan increase of tocopherols from 35 nmol mol–1 chl(treatment I) to 400 nmol (treatment IV). This effect was not significant inthe drought-deciduous species with succulent rhizomes,Po. puberulum (about 10 nmolmol–1 chl) and Ph. areolatum(5 to maximum 40 nmol), which experience little desiccation under fieldconditions. This short-term induction of tocopherols and carotenoids has notbeen reported for other plants under light stress and is probably related tothe epiphytic life form.

The Role of Gold Nanoparticles' Aspect Ratio in Plasmon-Enhanced Luminescence and Singlet Oxygen Generation Rate by Mo6 Clusters

2021 ◽  
Author(s):  
Evgeniya D. Novikova ◽  
Yuri A. Vorotnikov ◽  
Nazar A. Nikolaev ◽  
Alphiya R Tsygankova ◽  
Michael A. Shestopalov ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Aspect Ratio ◽  
Singlet Oxygen ◽  
Oxygen Production ◽  
Oxygen Generation ◽  
Singlet Oxygen Generation ◽  
Oxygen Production Rate ◽  
Plasmon Enhanced Luminescence ◽  
Enhanced Luminescence

Here we present a study on the effect of the aspect ratio (AR) of gold nanoparticles on the emission intensity and singlet oxygen production rate of hexamolybdenum cluster-doped silica particles....

scholarly journals On the Involvement of Singlet Oxygen in the Biosynthesis of Oxygenation Products of the Furocoumarin Imperatorine

1984 ◽  
Vol 39 (10) ◽  
pp. 1433-1441 ◽  
Author(s):  
Nicolaas J. de Mol ◽  
Johannes Reisch ◽  
Gerardus M. J. Beijersbergen van Henegouwen
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Protective Effect ◽  
Singlet Oxygen ◽  
Oxidation Products ◽  
Photo Oxidation ◽  
Uva Light ◽  
Β Carotene

The role of singlet oxygen (1O2) in the photo-oxidation of the furocoumarin im peratorine was investigated in vitro. Irradiation with visible light and sensitization with methylene blue yielded the imperatorine oxidation product isogosferol and the corresponding ketone as main products. The involvement of 1O2 was dem onstrated by studying the rate of oxidation under conditions that affect the lifetime of 1O2. Com pared to a range of other furocoumarins, im peratorine appeared to be moderately active as a 1O2 generator. The extent of 1O2 production correlated with the skin sensitizing activity. Upon irradiation of im peratorine itself with UVA light (360 nm) no isogosferol formation is observed, probably as a consequence of its photochemical instability. Irradiation with visible light (λ > 400 nm) of a chlorophyll chromophore containing sensitizer in the presence of imperatorine, yielded isogosferol and the corresponding ketone product. This dem onstrates that in the formation of 1O2 oxidation products of imperatorine in plants naturally occuring sensitizers e.g. chlorophyll and visible light are involved, rather than 1O2 produced by im peratorine or other furocoumarins and UVA light. The protective effect on the chlorophyll sensitized im peratorine oxidation by the 1O2- and chlorophyll triplet quencher β-carotene was demonstrated in a lipophilic solvent.

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