Chlorophyll a epimer and pheophytin a in green leaves

1985 ◽  
Vol 807 (2) ◽  
pp. 110-117 ◽  
Author(s):  
Tadashiá Watanabe ◽  
Masataka Nakazato ◽  
Hitoshi Mazaki ◽  
Akinori Hongu ◽  
Mitsuo Konno ◽  
...  
Keyword(s):  
Chlorophyll A ◽  
Pheophytin A ◽  
Green Leaves

Removal of Magnesium by Mg-dechelatase Is a Major Step in the Chlorophyll-Degrading Pathway in Ginkgo biloba in the Process of Autumnal Tints

2000 ◽  
Vol 55 (11-12) ◽  
pp. 923-926 ◽  
Author(s):  
Lei Tang ◽  
Atsushi Okazawa ◽  
Eiichiro Fukusaki ◽  
Akio Kobayashi
Keyword(s):  
Ginkgo Biloba ◽  
Hplc Analysis ◽  
Deciduous Trees ◽  
Natural Phenomena ◽  
Major Step ◽  
Pheophytin A ◽  
Chl A ◽  
Degrading Enzymes ◽  
Green Leaves ◽  
Related Compounds

Autumnal tints are one of the most manifest and fascinating natural phenomena, but the mechanism of chlorophyll (Chl)-breakdown in deciduous trees has not been fully elucidated. In this study, we analyzed the composition of Chl-related compounds and determined the activities of initial Chl-degrading enzymes in Ginkgo leaves at various stages in the process of autumnal coloring. Only pheophytin a (Pheo a, Mg-free Chl a) was detected in yellow leaves by HPLC analysis, and the activity of Mg-dechelatase in yellow leaves was found to be higher than in green leaves. These findings showed that the removal of magnesium from Chl a occurred in advance of dephytylation in the Ginkgo.

Single-site absorption spectroscopy of pheophytin-a and chlorophyll-a in a n-octane matrix

1980 ◽  
Vol 76 (1) ◽  
pp. 35-41 ◽  
Author(s):  
R.J. Platenkamp ◽  
H.J. Den Blanken ◽  
A.J. Hoff
Keyword(s):  
Chlorophyll A ◽  
Absorption Spectroscopy ◽  
Single Site ◽  
Pheophytin A

Interactions between Photosynthetic Pigments Bound to Lipid and Protein Particles. Spectroscopic Properties

1979 ◽  
Vol 34 (7-8) ◽  
pp. 582-587
Author(s):  
Framçoise Techy ◽  
Monique Dinant ◽  
Jacques Aghion
Keyword(s):  
Chlorophyll A ◽  
Photosynthetic Pigments ◽  
Relative Concentration ◽  
Spectroscopic Properties ◽  
Chlorophyll B ◽  
Pheophytin A ◽  
Chlorophylls A And B ◽  
Protein Particles ◽  
Β Carotene

Abstract The spectroscopic (visible) properties of pigment-bearing lipid and protein particles extract­ ed from milk show that: 1) chlorophylls a and b bound to separate particles can form aggregates provided their relative concentration is high enough. Neither pheophytin a nor β-carotene, in the same conditions, form observable aggregates. 2) Chlorophylls a and b can co-aggregate when they are bound to the same particles. Pheophytin a as well as β-carotene seem to prevent the aggregation of chlorophyll a. β-carotene has no effect on the aggregation of chlorophyll b.

Reduction of the Formyl Group of Zinc Pheophorbide b in vitro and in vivo: a Model for the Chlorophyll b to a Transformation

1996 ◽  
Vol 51 (3-4) ◽  
pp. 185-194 ◽  
Author(s):  
Verena Scheumann ◽  
Michael Helfrich ◽  
Siegrid Schoch ◽  
Wolfhart Rüdiger
Keyword(s):  
Nmr Spectroscopy ◽  
Chlorophyll A ◽  
Chemical Reduction ◽  
Chlorophyll B ◽  
Formyl Group ◽  
Pheophorbide A ◽  
Pheophytin A ◽  
H Nmr

Abstract The chemical reduction of the formyl group of pheophorbide b with sodium cyanoborohy­ dride in methanol leads to 71-methoxy-and 71-hydroxy-pheophorbide a. The same reaction with zinc pheophorbide b yields in addition zinc pheophorbide a. This was characterized by mass and 1H -NMR spectroscopy. Infiltration of zinc pheophorbides a and b and of zinc 71-hydroxy-pheophorbide a into etiolated oat leaves yielded phytylated products. The best yield in the esterification was obtained with 71-hydroxy-pheophorbide a. Analysis of the products revealed the formation of zinc pheophytin a from all infiltrated compounds. The significance for the transformation of chlorophyll b into chlorophyll a is discussed.

Effect of pollutant gases on chlorophyll a multilayer

1981 ◽  
Vol 59 (15) ◽  
pp. 2402-2411 ◽  
Author(s):  
Camille Chapados ◽  
Denis Germain ◽  
Roger M. Leblanc
Keyword(s):  
Ir Spectra ◽  
Atomic Absorption ◽  
Chlorophyll A ◽  
Direct Effect ◽  
Time Effect ◽  
Reaction Products ◽  
Pheophytin A ◽  
Chl A ◽  
End Products ◽  
Pollutant Gases

The aim of this paper is to examine the direct effect of polluting gases on chlorophyll a (chl a) multilayer arrays. The pollutants studied are CO, CO2, SO2, H2S, NO, and NO2. Electronic and infrared spectroscopies were used to monitor the time effect of the polluting gases on chl a molecules. TLC, atomic absorption, and electronic spectroscopies were used to characterise the reaction products. The results show that neither CO nor CO2 affect the chl a molecules in the multilayer arrays. Upon exposure to SO2, we notice many modifications on the electronic and ir spectra. All the evidence confirms that one of the reaction products is pheophytin a. A mechanism is presented to explain the reaction of SO2 with chl a. The effect of H2S on chl a is less pronounced than that of SO2, but the end products are the same. NO and NO2 have exactly the same effect on the chl a multilayer. The reaction is much more drastic than the reaction of chl a with either SO2 or H2S. There is opening of the cycle and nitration of the chl a molecule.

scholarly journals THE ORIENTATION OF THE TRANSITION DIPOLE MOMENTS OF CHLOROPHYLL a and PHEOPHYTIN a IN THEIR MOLECULAR FRAME

1995 ◽  
Vol 62 (2) ◽  
pp. 299-308 ◽  
Author(s):  
M. A. M. J. van Zandvoort ◽  
D. Wróbel ◽  
P. Lettinga ◽  
G.van Ginkel ◽  
Y. K. Levine
Keyword(s):  
Chlorophyll A ◽  
Dipole Moments ◽  
Transition Dipole ◽  
Pheophytin A ◽  
Transition Dipole Moments ◽  
Molecular Frame
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