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Extinction coefficient for red-shifted chlorophylls: Chlorophyll d and chlorophyll f

Journal Article · · Biochimica et Biophysica Acta - Bioenergetics

Both chlorophyll f and chlorophyll d are red-shifted chlorophylls in oxygenic photosynthetic organisms, which extend photon absorbance into the near infrared region. This expands the range of light that can be used to drive photosynthesis. Quantitative determination of chlorophylls is a crucial step in the investigation of chlorophyll-photosynthetic reactions in the field of photobiology and photochemistry. No methods have yet been worked out for the quantitative determination of chlorophyll f. There is also no method available for the precise quantitative determination of chlorophyll d although it was discovered in 1943. In order to obtain the extinction coefficients (ε) of chlorophyll f and chlorophyll d, the concentrations of chlorophylls were determined by Inductive Coupled Plasma Mass Spectrometry according to the fact that each chlorophyll molecule contains one magnesium (Mg) atom. Molar extinction coefficient ε(chl f) is 71.11×10(3)Lmol(-1)A(707nm)cm(-1) and ε(chl d) is 63.68×10(3)Lmol(-1)A(697nm)cm(-1) in 100% methanol. This article is part of a Special Issue entitled: Photosynthesis Research for Sustainability: from Natural to Artificial.

Research Organization:
Washington Univ., St. Louis, MO (United States)
Sponsoring Organization:
USDOE SC Office of Basic Energy Sciences (SC-22)
DOE Contract Number:
SC0001035
OSTI ID:
1049309
Report Number(s):
DE-SC0001035-58
Journal Information:
Biochimica et Biophysica Acta - Bioenergetics, Journal Name: Biochimica et Biophysica Acta - Bioenergetics Journal Issue: 8 Vol. 1817; ISSN 0005-2728
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

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