Singlet oxygen quenching by dietary carotenoids in a model membrane environment

Cantrell, Ann; McGarvey, David J.; Truscott, T. George; Rancan, Fiorenza; Böhm, Fritz

doi:10.1016/s0003-9861(03)00014-6

Cited by 259 publications

(174 citation statements)

References 28 publications

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“…Our observation of a significant increase in b-carotene in SD/HT (Fig. 5) points toward an increased formation of singletexcited oxygen ( 1 O 2 *), which can efficiently be quenched by b-carotene (Cantrell et al, 2003;Krieger-Liszkay, 2005;Telfer, 2005). 1 O 2 * is generated from singletexcited Chl via the Chl triplet state, if the energy of excited Chl cannot be used for photochemistry or dissipated as heat (Adams et al, 2004).…”

Section: Acclimation Of Photosynthetic Energy Conversion and Compositmentioning

confidence: 79%

Increased Air Temperature during Simulated Autumn Conditions Does Not Increase Photosynthetic Carbon Gain But Affects the Dissipation of Excess Energy in Seedlings of the Evergreen Conifer Jack Pine

2007

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Temperature and daylength act as environmental signals that determine the length of the growing season in boreal evergreen conifers. Climate change might affect the seasonal development of these trees, as they will experience naturally decreasing daylength during autumn, while at the same time warmer air temperature will maintain photosynthesis and respiration. We characterized the down-regulation of photosynthetic gas exchange and the mechanisms involved in the dissipation of energy in Jack pine (Pinus banksiana) in controlled environments during a simulated summer-autumn transition under natural conditions and conditions with altered air temperature and photoperiod. Using a factorial design, we dissected the effects of daylength and temperature. Control plants were grown at either warm summer conditions with 16-h photoperiod and 22°C or conditions representing a cool autumn with 8 h/7°C. To assess the impact of photoperiod and temperature on photosynthesis and energy dissipation, plants were also grown under either cold summer (16-h photoperiod/7°C) or warm autumn conditions (8-h photoperiod/22°C). Photosynthetic gas exchange was affected by both daylength and temperature. Assimilation and respiration rates under warm autumn conditions were only about one-half of the summer values but were similar to values obtained for cold summer and natural autumn treatments. In contrast, photosynthetic efficiency was largely determined by temperature but not by daylength. Plants of different treatments followed different strategies for dissipating excess energy. Whereas in the warm summer treatment safe dissipation of excess energy was facilitated via zeaxanthin, in all other treatments dissipation of excess energy was facilitated predominantly via increased aggregation of the light-harvesting complex of photosystem II. These differences were accompanied by a lower deepoxidation state and larger amounts of b-carotene in the warm autumn treatment as well as by changes in the abundance of thylakoid membrane proteins compared to the summer condition. We conclude that photoperiod control of dormancy in Jack pine appears to negate any potential for an increased carbon gain associated with higher temperatures during the autumn season.

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Section: Acclimation Of Photosynthetic Energy Conversion and Compositmentioning

confidence: 79%

Increased Air Temperature during Simulated Autumn Conditions Does Not Increase Photosynthetic Carbon Gain But Affects the Dissipation of Excess Energy in Seedlings of the Evergreen Conifer Jack Pine

2007

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“…While this is significantly lower than the 70-90% entrapment shown using chloroform, it is encouraging that between 40-50% of the added β-carotene can be incorporated in the liposome membrane using a food-safe solvent. However, due to previously mentioned problems regarding the removal of aggregated β-carotene, the concentrations of β-carotene used in these experiments are very low compared with those seen in the literature [2,6,10,11,18,22,24,25] or those that would be required for most food applications.…”

Section: β-Carotene Entrapmentmentioning

confidence: 97%

Comparison of hydrophobic and hydrophilic encapsulation using liposomes prepared from milk fat globule-derived phospholipids and soya phospholipids

Thompson

Couchoud

Singh

2009

Dairy Sci. Technol.

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-Liposomes prepared from a milk fat globule membrane (MFGM) phospholipid fraction have been shown to have significantly different physical and chemical characteristics and appeared to be more stable in a variety of conditions than liposomes prepared from soya phospholipid material. These liposome systems were used to try to encapsulate model hydrophobic (β-carotene) and hydrophilic (potassium chromate) compounds. Liposomes produced from the MFGM-derived phospholipids showed significantly higher entrapment efficiencies for both β-carotene and potassium chromate. The differences were particularly apparent when using the hydrophobic molecules at low ratios of β-carotene to phospholipid. It is likely that the improved incorporation efficiency for β-carotene is due to the partitioning of the molecule between the aqueous phase and the phospholipid membrane, a property which will be dependent on the specific composition of the phospholipid material used. The higher encapsulation efficiency for the potassium chromate appeared to reflect the slightly larger diameter of the liposomes produced from the MFGM material. These results suggest that there may be inherent advantages in the use of liposomes prepared from MFGM-derived phospholipids via microfluidization for the encapsulation of both hydrophobic and hydrophilic compounds.

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“…In vitro studies of human RPE cells, subjected to oxidative stress, have demonstrated enhanced survival of these cells in the presence of Z and other antioxidants, when compared with controls (Wrona et al, 2004). Z appears to be a more potent antioxidant than L (Cantrell et al, 2003) and MZ is yet more efficacious, but only in conjunction with its binding protein (Bhosale and Bernstein, 2005). Recently, Li et al demonstrated that a mixture of L, Z and MZ (in a ratio of 1:1:1) quenches more singlet oxygen than any of these carotenoids individually but at the same total concentration (Li et al, 2010).…”

Section: Retinal Eccentricitymentioning

confidence: 99%

Macular carotenoid supplementation in subjects with atypical spatial profiles of macular pigment

Nolan

Akkali

Loughman

et al. 2012

Experimental Eye Research

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Singlet oxygen quenching by dietary carotenoids in a model membrane environment

Cited by 259 publications

References 28 publications

Increased Air Temperature during Simulated Autumn Conditions Does Not Increase Photosynthetic Carbon Gain But Affects the Dissipation of Excess Energy in Seedlings of the Evergreen Conifer Jack Pine

Increased Air Temperature during Simulated Autumn Conditions Does Not Increase Photosynthetic Carbon Gain But Affects the Dissipation of Excess Energy in Seedlings of the Evergreen Conifer Jack Pine

Comparison of hydrophobic and hydrophilic encapsulation using liposomes prepared from milk fat globule-derived phospholipids and soya phospholipids

Macular carotenoid supplementation in subjects with atypical spatial profiles of macular pigment

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