On the Near Ultraviolet Absorption Bands of Nitric Oxide Solutions

1962 ◽  
Vol 37 (2) ◽  
pp. 457-458 ◽  
Author(s):  
S. R. La Paglia
Keyword(s):  
Nitric Oxide ◽  
Ultraviolet Absorption ◽  
Absorption Bands ◽  
Near Ultraviolet

Near-ultraviolet absorption bands of tryptopan. Studies using indole and 3-methylindole as models

Biochemistry ◽  
1970 ◽  
Vol 9 (25) ◽  
pp. 4914-4921 ◽  
Author(s):  
E. Hardin Strickland ◽  
Joseph Horwitz ◽  
Carolyn Billups
Keyword(s):  
Ultraviolet Absorption ◽  
Absorption Bands ◽  
Near Ultraviolet

Steric Effects on the Near-Ultraviolet Absorption (Soret Band) of Porphyrins

1963 ◽  
Vol 85 (22) ◽  
pp. 3621-3624 ◽  
Author(s):  
Alsoph H. Corwin ◽  
David G. Whitten ◽  
Earl W. Baker ◽  
George G. Kleinspehn
Keyword(s):  
Soret Band ◽  
Ultraviolet Absorption ◽  
Steric Effects ◽  
Near Ultraviolet

Initial Reaction Intermediates in the Oxidation of Ascorbic Acid by Nitrous Acid

1981 ◽  
Vol 44 (1) ◽  
pp. 28-32 ◽  
Author(s):  
JAY B. FOX ◽  
ROSEMARY N. FIDDLER ◽  
AARON E. WASSERMAN
Keyword(s):  
Nitric Oxide ◽  
Ascorbic Acid ◽  
Nitrous Acid ◽  
Organic Radicals ◽  
Initial Reaction ◽  
Reaction Intermediates ◽  
Absorption Bands ◽  
Visible Absorption ◽  
Decomposition Products

Nitrite and ascorbate react to form nitric oxide at pH 5.5. In the initial stages of the reaction, seven intermediates can be identified spectrally and chromatographically; these include two colorless nitroso derivatives which contain 30–60% of the initial nitrite, two nitroso reductant derivatives absorbing at 345 and 412 nm, diketogulonic acid and two further decomposition products. None of the intermediates was paramagnetic; except for diketogulonic acid, all decomposed rapidly during or after isolation. Based on the order of appearance of the ultraviolet and visible absorption bands in the reaction mixtures, the observed characteristics of the intermediates, and the lack of organic radicals, a sequence is proposed for the initial steps in the oxidation of ascorbic acid by nitrous acid.

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