Effect of nucleobase sequence on the proton-transfer reaction and stability of the guanine–cytosine base pair radical anion

2011 ◽  
Vol 13 (7) ◽  
pp. 2674-2681 ◽  
Author(s):  
Hsing-Yin Chen ◽  
Shu-Wen Yeh ◽  
Sodio C. N. Hsu ◽  
Chai-Lin Kao ◽  
Teng-Yuan Dong
Keyword(s):  
Proton Transfer ◽  
Base Pair ◽  
Radical Anion ◽  
Transfer Reaction ◽  
Proton Transfer Reaction

scholarly journals Double-Proton-Transfer Reaction in Guanine-Cytosine Base Pair Embedded in B-Form DNA

2013 ◽  
Vol 29 (06) ◽  
pp. 1233-1239 ◽  
Author(s):  
LIN Yue-Xia ◽  
◽  
WANG Hong-Yan ◽  
GAO Si-Min ◽  
WU Ying-Xi ◽  
...  
Keyword(s):  
Proton Transfer ◽  
Base Pair ◽  
Transfer Reaction ◽  
Proton Transfer Reaction ◽  
Double Proton Transfer

scholarly journals Identifying volatile in vitro biomarkers for oral bacteria with proton-transfer-reaction mass spectrometry and gas chromatography–mass spectrometry

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kajsa Roslund ◽  
Markku Lehto ◽  
Pirkko Pussinen ◽  
Kari Hartonen ◽  
Per-Henrik Groop ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Proton Transfer ◽  
Transfer Reaction ◽  
Proton Transfer Reaction ◽  
Oral Bacteria ◽  
Gas Chromatography Mass Spectrometry ◽  
Volatile Analysis ◽  
Bacterial Volatiles

AbstractWe have measured the volatile fingerprints of four pathogenic oral bacteria connected to periodontal disease and dental abscess: Porphyromonas gingivalis (three separate strains), Prevotella intermedia, Prevotella nigrescens and Tannerella forsythia. Volatile fingerprints were measured in vitro from the headspace gas of the bacteria cultured on agar. Concrete identification of new and previously reported bacterial volatiles were performed by a combination of solid phase microextraction (SPME) and offline gas chromatography–mass spectrometry (GC–MS). We also studied the effect of the reduced electric field strength (E/N) on the fragmentation patterns of bacterial volatiles in online proton-transfer-reaction time-of-flight mass spectrometry (PTR-ToF-MS). We aimed to discover possible new biomarkers for the studied oral bacteria, as well as to validate the combination of GC–MS and PTR-MS for volatile analysis. Some of the most promising compounds produced include: 1-Methyl-1,2,3,4-tetrahydroisoquinoline (1MeTIQ), indole, and a cascade of sulphur compounds, such as methanethiol, dimethyl disulphide (DMDS) and dimethyl trisulphide (DMTS). We also found that several compounds, especially alcohols, aldehydes and esters, fragment significantly with the PTR-MS method, when high E/N values are used. We conclude that the studied oral bacteria can be separated by their volatile fingerprints in vitro, which could have importance in clinical and laboratory environments. In addition, using softer ionization conditions can improve the performance of the PTR-MS method in the volatile analysis of certain compounds.

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