ACTA BIOLOGICA CRACOVIENSIA

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16 TH INTERNATIONAL SYMPOSIUM ON CAROTENOIDS This project is financially supported by Higher Education Commission of Pakistan (HEC) and the Norwegian Centre for International Cooperation in Higher Education (SIU). REFERENCES ROUTH HB, BHOWMIK KR, PARISH LC. Clinics in Dermatology. 1996. 14: 3. CHEVREUIL ME. Recherches Chimiques sur les corps gras ïorigine animale. Levrault, Paris, 1823. 3.30. Carotenoid as antireductants Muhammad Zeeshan, Vassilia Partali, Hans-Richard Sliwka Department of Chemistry, Realfagbygget, Norwegian University of Science and Technology, 7491 Trondheim, Norway, muhammad.zeeshan@chem.ntnu.no, hrs@nvg.ntnu.no, vassilia.partali@nt.ntnu.no The electron-rich carotenoids are prime examples for their electron donor property to reactive radicals. The reverse reaction, the uptake of electrons by Car, has not yet been observed in nature and is difficult to perform in the laboratory. Cyclic polyenes easily take up electrons (Birch reduction), but chain polyenes resist SESSION 3 in electron transfer reactions. Carotenoids were forced to take up electrons by difficult chemical procedures (Na in high vacuum) or with methods requiring special instruments (electrochemistry, flash photolysis, pulse radiolysis). Nevertheless, it has been predicted theoretically that carotenoids could act favorably as electron acceptors. Recently, crocetindial has been reacted in a simple procedure with the electron donator alkaline DMSO = – – H3C(S=O)CH2 = DMSO (Øpstad et al., 2010). An immediate two-electron uptake reaction to crocetin dienolate was observed by a color change to blue. We present now the synthesis of a series of dialdehydes (C10:3 to C50:19) and describe their electron uptake properties with regard to the chain length. Carbonyl carotenoids, like any other carotenoid, may act as antioxidants by releasing electrons. We demonstrate that carbonyl carotenoids also easily accept electrons; therefore, these carotenoids react as antireductants. This project is financially supported by the Higher Education Commission Pakistan (HEC) and the Norwegian Centre for International Cooperation in Higher Education (SIU). REFERENCES ØPSTAD CL, SLIWKA HR, PARTALI V. 2010. Facile electron uptake by carotenoids under mild, non-radiative conditions: formation of carotenoid anions. Eur. J. Org. Chem 4637-4641. 64 ACTA BIOLOGICA CRACOVIENSIA Series Botanica
Session 4 Carotenoids in the Prevention of Cancer and Cardiovascular Disease
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ACTA BIOLOGICA CRACOVIENSIA SERIES
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ACTA BIOLOGICA CRACOVIENSIA Series
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Patronage Mayor of the City of Krak
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Organizing Committee Małgorzata Ba
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Plenary lectures
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16 TH INTERNATIONAL SYMPOSIUM ON CA
Page 15 and 16: Session 1 Nutritional Carotenoids a
Page 17 and 18: NUTRITIONAL CAROTENOIDS AND THEIR I
Page 31 and 32: Session 2 Photosynthesis, Photochem
Page 33 and 34: PHOTOSYNTHESIS, PHOTOCHEMISTRY, AND
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Page 48 and 49: Professor Dr. Hans-Dieter Martin 19
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Page 67 and 68: CAROTENOIDS IN THE PREVENTION OF CA
Page 73: Session 5 Interaction of Carotenoid
Page 83 and 84: BIOSYNTHESIS, GENETICS, AND METABOL
Page 95: Session 7 Carotenoids and Vision
Page 105 and 106: MODEL SYSTEMS, COMPUTATIONAL AND IN
Page 111 and 112: Index of Authors Abe K 44 Abramchik
Page 113 and 114: Szõke E 58 Szolcsány J 58 Szurkow
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ROMEO JT. 1973. A chemotaxonomic st
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