Spin Dynamics of the Radicals Produced from Methane Sulfonic Acid and Acetic Acid by Hydroxyl Radicals in Aqueous Solution Studied by Means of Time-Resolved Electron Spin Resonance Spectroscopy

2021 ◽  
Author(s):  
Yutaka Kuwabara ◽  
Masahiro Kitazawa ◽  
Atsuko Y. Nosaka ◽  
Yoshio Nosaka
Keyword(s):  
Aqueous Solution ◽  
Acetic Acid ◽  
Hydroxyl Radicals ◽  
Sulfonic Acid ◽  
Spin Dynamics ◽  
Electron Spin Resonance Spectroscopy ◽  
Resonance Spectroscopy ◽  
Methane Sulfonic Acid ◽  
Time Resolved ◽  
Spin Resonance

scholarly journals Antioxidant activity of Induna apple pomace extract

2005 ◽  
pp. 239-246 ◽  
Author(s):  
Sladjana Savatovic ◽  
Sonja Djilas ◽  
Vesna Tumbas ◽  
Jasna Canadanovic-Brunet ◽  
Gordana Cetkovic
Keyword(s):  
Aqueous Solution ◽  
Antioxidant Activity ◽  
Acetic Acid ◽  
Electron Spin Resonance ◽  
Hydroxyl Radicals ◽  
Electron Spin ◽  
Esr Spectroscopy ◽  
Methanol Extract ◽  
Apple Pomace ◽  
Spin Resonance

Different concentrations ofmethanol aqueous solution with or without 0.5% acetic acid and 80% acetone were used to achieve the highest yield of extraction of phenolics from Induna apple pomace. The highest content of phenolics (6.38 mg/g) was detected in the 80% methanol extract. The influence of 80% methanol extract of Induna apple pomace on stable l,l-diphenyl-2-picrylhydrazyl (DPPH) and reactive hydroxyl radicals has been investigated by electron spin resonance (ESR) spectroscopy. Based on the obtained results it can be concluded that the investigated extract is more effective in the DPPH test than on the DMPO-OH scavenging. In both cases antioxidant activity increased with increasing concentration of the investigated extract. The high contents ofphenolics (6.38 mg/g), flavonoids (1.01 mg/g) and flavan-3-ols (0.70 mg/g) in 80% methanol extract indicated that these compounds contributed to the antioxidant activity of Induna apple pomace.

ESR and Optical Studies on the Interaction between cis-Dichlorodiammine Platinum(II) and Tryptophan

1979 ◽  
Vol 34 (7) ◽  
pp. 1015-1018 ◽  
Author(s):  
Harald Neubacher ◽  
Peter Zaplatynski ◽  
Axel Haase ◽  
Wolfgang Lohmann
Keyword(s):  
Aqueous Solution ◽  
Electron Spin Resonance ◽  
Reaction Time ◽  
Esr Spectra ◽  
Electron Spin Resonance Spectroscopy ◽  
Resonance Spectroscopy ◽  
Optical Studies ◽  
Spin Resonance ◽  
Paramagnetic Complexes ◽  
Anticancer Compound

Abstract cts-Dichlorodiammine platinum(II), which is known to be an active anticancer compound, and tryptophan form paramagnetic complexes in aqueous solution. These can be detected by means of electron spin resonance spectroscopy (ESR) after a reaction time of several hours. The ESR spectra are interpreted to be due to Pt(III) in a low spin d7 configuration. The optical results obtained are in accordance with the assumption of columnar structures of the paramagnetic complexes

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