Geochemistry of Porphyrins—reactions During Diagenesis

Hodgson, G. W.

doi:10.1111/j.1749-6632.1973.tb43244.x

Cited by 25 publications

(15 citation statements)

References 60 publications

(5 reference statements)

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“…The shift in electronic absorption to higher energy (hypsochromism) has been attributed to reduction of ring-conjugating groups (cf. Baker and Smith, 1973;Hodgson, 1973;Smith and Baker, 1974) and appears to retain validity. The possibility of concerted reduction, hydrolysis, dehydration, decarboxylation, and the like needs further investigation, for not only will reduction of a con- jugated group lead to hypsochromic shifts in absorption spectra, but complete removal of these same functions will also.…”

Section: Pigment Yield and Observed Trendsmentioning

confidence: 91%

Products of Chlorophyll Diagenesis in Japan Trench Sediments, Deep Sea Drilling Project Sites 438, 439, and 440

Baker¹,

Louda²

1980

Initial Reports of the Deep Sea Drilling Project

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Section: Pigment Yield and Observed Trendsmentioning

confidence: 91%

Products of Chlorophyll Diagenesis in Japan Trench Sediments, Deep Sea Drilling Project Sites 438, 439, and 440

Baker¹,

Louda²

1980

Initial Reports of the Deep Sea Drilling Project

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“…This enables multinational companies to ripen the fruit in bulk at the same time in an almost uniform fashion. 93 Such diagenic compounds can serve as geochemical biomarkers as long as they retain enough structural resemblance to biochemical compounds. It is thus critical to control the level of "artificial ripening" and the use of UV lamps for the detection of FCCs and hence ripening could have a major economic impact, helping with prolonging the narrow shelflife window for bananas.…”

Section: Chlorophyll Biosynthesismentioning

confidence: 99%

How green is green chemistry? Chlorophylls as a bioresource from biorefineries and their commercial potential in medicine and photovoltaics

Ryan

Senge

2015

Photochem Photobiol Sci

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As the world strives to create a more sustainable environment, green chemistry has come to the fore in attempts to minimize the use of hazardous materials and shift the focus towards renewable sources. Chlorophylls, being the definitive "green" chemical are rarely used for such purposes and this article focuses on the exploitation of this natural resource, the current applications of chlorophylls and their derivatives whilst also providing a perspective on the commercial potential of large-scale isolation of these pigments from biomass for energy and medicinal applications.

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“…A copper porphyrin (i.e., uroporphyrin III) has been found in the feathers of birds, such as the Turacus indicus [ 44 , 45 ]. Due to their natural participation in animals and plants, porphyrins of nickel or vanadium were found in oil shale, bituminous sands, asphalt, and petroleum as consequence of the long time degradation of plants trapped under deep earth layers [ 46 ].…”

Section: Crossed and Linked Histories Of Tetrapyrrolic Or How Natumentioning

confidence: 99%

Crossed and Linked Histories of Tetrapyrrolic Macrocycles and Their Use for Engineering Pores within Sol-Gel Matrices

et al. 2013

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The crossed and linked histories of tetrapyrrolic macrocycles, interwoven with new research discoveries, suggest that Nature has found in these structures a way to ensure the continuity of life. For diverse applications porphyrins or phthalocyanines must be trapped inside solid networks, but due to their nature, these compounds cannot be introduced by thermal diffusion; the sol-gel method makes possible this insertion through a soft chemical process. The methodologies for trapping or bonding macrocycles inside pristine or organo-modified silica or inside ZrO2 xerogels were developed by using phthalocyanines and porphyrins as molecular probes. The sizes of the pores formed depend on the structure, the cation nature, and the identities and positions of peripheral substituents of the macrocycle. The interactions of the macrocyclic molecule and surface Si-OH groups inhibit the efficient displaying of the macrocycle properties and to avoid this undesirable event, strategies such as situating the macrocycle far from the pore walls or to exchange the Si-OH species by alkyl or aryl groups have been proposed. Spectroscopic properties are better preserved when long unions are established between the macrocycle and the pore walls, or when oligomeric macrocyclic species are trapped inside each pore. When macrocycles are trapped inside organo-modified silica, their properties result similar to those displayed in solution and their intensities depend on the length of the alkyl chain attached to the matrix. These results support the prospect of tuning up the pore size, surface area, and polarity inside the pore cavities in order to prepare efficient catalytic, optical, sensoring, and medical systems. The most important feature is that research would confirm again that tetrapyrrolic macrocycles can help in the development of the authentic pore engineering in materials science.

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Geochemistry of Porphyrins—reactions During Diagenesis

Cited by 25 publications

References 60 publications

Products of Chlorophyll Diagenesis in Japan Trench Sediments, Deep Sea Drilling Project Sites 438, 439, and 440

Products of Chlorophyll Diagenesis in Japan Trench Sediments, Deep Sea Drilling Project Sites 438, 439, and 440

How green is green chemistry? Chlorophylls as a bioresource from biorefineries and their commercial potential in medicine and photovoltaics

Crossed and Linked Histories of Tetrapyrrolic Macrocycles and Their Use for Engineering Pores within Sol-Gel Matrices

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