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

The first successful synthesis of hierarchical CuSAPO-34 (3.9 wt.% Cu) is reported using the polymer Pluronic F127 as mesoporous structure directing agent (SDA). X-ray absorption spectroscopy (XAS) proved single site...

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

Zeitschrift für Naturforschung C ◽

10.1515/znc-1979-7-816 ◽

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.

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ChemInform Abstract: ONE-ELECTRON OXIDATION OF PHOTOSYNTHETIC PIGMENTS IN MICELLES. BACTERIOCHLOROPHYLL A, CHLOROPHYLL A, CHLOROPHYLL B, AND PHEOPHYTIN A

Chemischer Informationsdienst ◽

10.1002/chin.198208114 ◽

1982 ◽

Vol 13 (8) ◽

Author(s):

J.-P. CHAUVET ◽

R. VIOVY ◽

R. SANTUS ◽

E. J. LAND

Keyword(s):

Chlorophyll A ◽

Photosynthetic Pigments ◽

Bacteriochlorophyll A ◽

Chlorophyll B ◽

Pheophytin A

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

Zeitschrift für Naturforschung C ◽

10.1515/znc-1996-3-409 ◽

1996 ◽

Vol 51 (3-4) ◽

pp. 185-194 ◽

Cited By ~ 22

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.

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Pheophytin a and Chlorophyll a Identified from Environmentally Friendly Cultivation of Green Pepper Enhance Interleukin-2 and Interferon-γ in Peyer’s Patches ex Vivo

Biological and Pharmaceutical Bulletin ◽

10.1248/bpb.b13-00302 ◽

2013 ◽

Vol 36 (11) ◽

pp. 1747-1753 ◽

Cited By ~ 1

Author(s):

Myoung-Yun Pyo ◽

Bo-kyung Park ◽

Jeong June Choi ◽

Mihi Yang ◽

Hyun Ok Yang ◽

...

Keyword(s):

Chlorophyll A ◽

Ex Vivo ◽

Interleukin 2 ◽

Environmentally Friendly ◽

Interferon Γ ◽

Peyer's Patches ◽

Peyer’S Patches ◽

Green Pepper ◽

Pheophytin A

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Effect of pollutant gases on chlorophyll a multilayer

Canadian Journal of Chemistry ◽

10.1139/v81-347 ◽

1981 ◽

Vol 59 (15) ◽

pp. 2402-2411 ◽

Cited By ~ 6

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.

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