Article

Dietary carotenoids protect human cells from damage

Humboldt-Universität zu Berlin, Berlín, Berlin, Germany
Journal of Photochemistry and Photobiology B Biology (Impact Factor: 2.8). 01/1995; 26(3):283-5. DOI: 10.1016/1011-1344(94)07049-0
Source: PubMed

ABSTRACT A physical chemistry technique based on singlet oxygen luminescence at about 1270 nm and a biological cell membrane technique were used to study the quenching of singlet oxygen by four carotenoids bound to the surface of lymphoid cells. All the carotenoids studied showed a beneficial effect in cell protection, but there were subtle differences between them.

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    • "It is probable that the reddish coloration of snow at alpine sites is caused by more species with similar immotile cells, as it was already observed in Antarctica (Ling, 1996; Fujii et al., 2010). The typical red spherical cells without flagella contain high amounts of astaxanthin that protects cells from UV-damage and potential photoinhibition (Bidigare et al., 1993), enables the transfer of excitation energy to chlorophyll a (Droop, 1955; Goodwin, 1980), and is also an effective antioxidant (Tinkler et al., 1994). Mature resting stages of C. nivalis may contain 20–30 times more astaxanthin than chlorophyll a (Muller et al., 1998; Remias et al., 2005). "
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    Phytochemistry 02/2013; DOI:10.1016/j.phytochem.2013.01.003 · 3.35 Impact Factor
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    • "The esterification of astaxanthin is considered to be a mechanism allowing efficient pigment concentration in cytoplasm (Bidigare et al., 1993). The protective role of astaxanthin in snow algal cells is apparently complex, because this secondary carotenoid is also an effective antioxidant (Tinkler et al., 1994). The water content in cells is reduced when astaxanthin concentration is high, reducing the likelihood of ice crystal formation (Hoham, 1992). "
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