Abstract
A carotenoid (Car) molecule, when in van der Waals contact with a chlorophyll (Chl) or CM-like partner molecule, acts as an efficient quencher of the lowest excited triplet state of the partner (Par) by participating in the process Car0:Part†→ Car†:Par0, where the colon signifies the contiguity of the two chromophores, and the superscripts 0 and dagger denote, respectively, the occupation of So, the ground singlet state and T1 the lowest excited triplet state (1,2). Nanosecond laser kinetic spectroscopy of isolated light-harvesting complexes has revealed that (bacterio)Chlt decays rapidly (that is, within ca. 200 ns or sooner), transferring its triplet excitation to a neighbouring Car0 (3–9) This means that the yield of the formation of Cart equals the corresponding yield of Part; to determine the latter yield, which is a quantity of much interest, one must know ε0 and ε†, the extinction coefficients (respectively) for the Sn←S0 and Tn←T1 transitions in Car. The values of ε0 are known for a great many Car’s (10), but the determination of et has lagged behind. The present study was undertaken with a view to filling this gap; here we present some preliminary results pertaining to the triplet-triplet spectra of lutein (Lut), neoxanthin (Neo), and violaxanthin (Vio), the three xanthophylls bound to LHCII (the Chla/b light-harvesting complex associated with photosystem II of green plants).
Preview
Unable to display preview. Download preview PDF.
Similar content being viewed by others
References
Frank, H.A. and Cogdell, R.J. (1996) Photochem. Photobiol. 63, 257–264.
Young, A.J. and Frank, H.A. (1996) J. Photochem. Photobiol. B: Biol. 36, 3–15.
Cogdell, R.J., Hipkins, M.F., MacDonald, W. and Truscott, T.G. (1981) Biochim. Biophys. Acta 634, 191–202.
Nechushtai, R., Thornber, J.P., Patterson, L.K., Fessenden, R.W. and Levanson, H. (1988) J. Phys. Chem. 92, 1165–1168.
Angerhofer. A., Bornhäuser, F., Gall, A. and Cogdell, R.J. (1995) Chem. Phys. 194, 259–274.
Barzda, V., Peterman, E.J.G., Van Grondelle, R. and Van Amerongen, H. (1998) Biochemistry 37, 546–551 (and earlier work cited therein).
Razi Naqvi, K., Melo, T.B., Bangar Raju, B., T. Jivorfi, Simidjiev, I. and Garab, G. (1997) Spectrochim. Acta Part A 53, 2659–2667.
Biichel, C., Razi Naqvi, K. and Melø, T.B. (1998) Spectrochim. Acta Part A 54, 719–726.
Razi Naqvi, K, Jävorfi, T., Melo, TB. and Garab, G. (1998) Spectrochim. Acta Part A (in press).
Britton, G. (1995) in Carotenoids, Vol. 1B: Spectroscopy (Britton, G., Liaaen- Jensen, S. and Pfander, H., ed.) pp. 13–62, Birkhäuser Verlag, Basel, Switzerland
Carmichael, I. And Hug, G.L. (1986) J. Phys. Chem. Ref. Data 15, 1–250.
Razi Naqvi, K., Melo, T.B., Bangar Raju, B., JAvorfi, T. and Garab, G. (1997) Spectrochim. Acta Part A 53, 1925–1936.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1998 Springer Science+Business Media Dordrecht
About this chapter
Cite this chapter
Jhutti, C.S., Jávorfi, T., Merzlyak, M.N., Naqvi, K.R. (1998). Triplet-Triplet Absorption Spectra and Extinction Coefficients of Lutein, Neoxanthin And Violaxanthin. In: Garab, G. (eds) Photosynthesis: Mechanisms and Effects. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3953-3_117
Download citation
DOI: https://doi.org/10.1007/978-94-011-3953-3_117
Publisher Name: Springer, Dordrecht
Print ISBN: 978-0-7923-5547-2
Online ISBN: 978-94-011-3953-3
eBook Packages: Springer Book Archive