Surface-enhanced resonance Raman spectroscopic identification of chlorophyll a allomers

Woolley, Paul S.; Keely, Brendan J.; Hester, R. E.

doi:10.1039/a701078h

Cited by 20 publications

(21 citation statements)

References 30 publications

(16 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The following assignments were thus made for the various peaks: The peaks around 735 and 1330 cm 1 were attributed to adenine derivatives (nicotinamide adenine dinucleotide (NAD), 16 -18 ATP, 19 RNA, 20 and DNA 21,22 (especially in a denaturized form)). These peaks may also be assigned to chlorophyll having Raman peaks at 740 and 1330 cm 1 , 23,24 but the other strong chlorophyll peaks (around 1290, 1533 and 1554 cm 1 ) were absent in our spectra. The peak at 1403 cm 1 may be assigned either to carboxylates or to sulfur-containing amino acids, such as cystine and methionine.…”

Section: Alfafamentioning

confidence: 85%

SERS of plant material

Zeiri

2007

J Raman Spectroscopy

View full text Add to dashboard Cite

Colloidal gold and silver were formed by the spontaneous reduction of metal salts by plant tissue -alfalfa seeds, green tea leaves, carrots and red cabbage. The colloids were analyzed using electron microscopy and spectroscopic tools. The reduction process yielded stable gold colloids, but for silver the colloidal particles were bigger and less stable, tending to form aggregates. The formation of metal colloids enabled surface-enhanced Raman spectra (SERS) measurements, yielding specific vibrational signatures for the plant components in the proximity of the colloids. The main SERS peaks were attributed to nicotinamide adenine dinucleotide (NAD) and other adenine-containing materials. Other peaks were assigned to flavins [e.g. flavin adenine dinucleotide (FAD)], chlorophyll, lipids and other biocomponents. Since the SERS spectra did not show any antioxidants common to all four different types of plant tissue, it is proposed that NAD and FAD compounds that play an important role in the respiration process may be involved in the metal reduction process.

show abstract

Section: Alfafamentioning

confidence: 85%

SERS of plant material

Zeiri

2007

J Raman Spectroscopy

View full text Add to dashboard Cite

show abstract

“…The chlorophyll allomer ( 2aMg , Scheme ) as well as the methoxylactones ( 3aMg, 3bMg , Scheme ) were prepared by stirring a methanolic solution of the corresponding chlorins for 2 days in the dark, under air 19,. 20 The allomer of pheophytin a ( 2a ) was extracted from anoxic surface sediments from a small eutrophic lake near Thonon, France 16…”

Section: Methodsmentioning

confidence: 99%

Environmental Impact Assessment of High Pressure Water Scrubbing Biogas Upgrading Technology

Cozma

Ghinea

Mămăligă

et al. 2013

CLEAN Soil Air Water

View full text Add to dashboard Cite

The aim of this work was to assess the burdens of a process in terms of environmental and health impacts, resource depletion issues, and energy demand based on the ability of the Life Cycle Assessment methodology to link the environmental impacts with the mass and energy flows. The analysis was done in terms of process and environmental performances of high pressure water scrubbing (HPWS) system applied for biogas upgrading. The application of process simulation based on the Aspen Plus® software has been considered as supportive for the calculation of mass and energy balances. Data processed using GaBi 4: Software showed that global warming, acidification, and human toxicity potentials were the main impact categories associated with the HPWS process. These indicators are largely related to the exhaust gas from the desorption column and the indirect emissions generated during energy consumption. The life cycle inventory study resulted in the development of a database with a vast inventory of data regarding HPWS technology. A basis for assessing potential improvements in the environmental performance of the system is provided. Future studies in this area will address the economical evaluation of the HPWS technology, so as to maximize economic efficiency and minimize environmental impacts.

show abstract

“…The improvement in sensitivity is not confined to chlorophyll a but can also be seen for the peaks eluting just prior to chlorophyll (t R 29–30 min; Fig. 5(b) which correspond to oxygenated transformation products (allomers) of chlorophylls 13. The presence of the allomers in the absence of post‐column addition of acid (Fig.…”

Section: Resultsmentioning

confidence: 89%

A novel approach for sensitivity enhancement in atmospheric pressure chemical ionisation liquid chromatography/mass spectrometry of chlorophylls

Airs

Keely

2000

Rapid Commun. Mass Spectrom.

View full text Add to dashboard Cite

Differences in the ionisation efficiency of chlorophylls and their phaeophytin counterparts result in lower sensitivity for atmospheric pressure chemical ionisation mass spectrometric detection of the former. Improvement in the sensitivity of detection of chlorophyll of around an order of magnitude at a concentration of 1 x 10(-6)mol L(-1) has been achieved using post-column addition of methanoic acid during analysis by liquid chromatography/mass spectrometry (LC/MS). The method gives linear response and is a simple strategy to improve sensitivity both for LC/MS and LC/MS/MS without loss of information relating to the precise nature of the tetrapyrrole distributions. Detection levels achieved exceed those obtained by absorbance detection.

show abstract

Surface-enhanced resonance Raman spectroscopic identification of chlorophyll a allomers

Cited by 20 publications

References 30 publications

SERS of plant material

SERS of plant material

Environmental Impact Assessment of High Pressure Water Scrubbing Biogas Upgrading Technology

A novel approach for sensitivity enhancement in atmospheric pressure chemical ionisation liquid chromatography/mass spectrometry of chlorophylls

Contact Info

Product

Resources

About