Light energy, absorbed as photons by chlorophylls and other pigment molecules consisting of light-harvesting complexes (LHCs), is transferred to the reaction centres (RCs), where, through charge separation, electrons flow from photosystem II (PSII) cytochrome b6f diffusible electron carriers I (PSI) [...]

Chlorophyll a is hydroxylated quantitatively in the Deposition, when chromatographed on silica gel thin-layer plates. This was shown by using HPLC as a non-destructive method für analyzing photosynthetic pigments. The hydroxy-group of Chi RC I, a 13-hydroxy-20-chloro-chl a. described by Dörnemann and Senger (1986) and Scheer et al. (1986), is shown to be artificially introduced during the purif...

The quantitative determination of chlorophyll (Chl) a, Chl b, and carotenoids in a wholepigment extract of green plant tissue by UVVIS spectroscopy is complicated by the choice of sample, solvent system, and spectrophotometer used. The various plant pigments absorb light in overlapping spectral regions, depending on the system selected. This unit discusses methods used to account for such overl...

We have measured the infra-red absorption spectra of chlorophyll and some of its derivatives in order to obtain information useful for eventual understanding of reversible transformations of this pigment. Such transformations are (a) Moliseh phase test, (b) bleaching by FeCl3, and (c) photochemical reduction by ascorbic acid-"Krasnovsky reaction" (10, 13, 16). Only in the case of the phase test...

Abstract Ground-level ozone pollution is a menace for vegetation in the northern hemisphere, limiting photosynthetic pigments and suppressing photosynthesis trees other types of plants. Phaeophytinization process converting chlorophylls into phaeophytins, example by acidification. Ozone highly oxidizing molecule well known to degrade chlorophylls; however, effect on phaeophytinization leaves hi...