A Symmetry rule for the Circular Dichroism of reducing sugars, and the proportion of Carbonyl forms in Aqueous solutions thereof

1977 ◽  
Vol 53 (1) ◽  
pp. 13-20 ◽  
Author(s):  
L. Douglas Hayward ◽  
Stephen J. Angyal
2019 ◽  
Vol 43 (38) ◽  
pp. 15201-15212 ◽  
Author(s):  
R. A. Cobos Picot ◽  
M. Puiatti ◽  
A. Ben Altabef ◽  
R. J. G. Rubira ◽  
S. Sanchez-Cortes ◽  
...  

The aim of this work is to evaluate the vibrational and structural properties of N-acetyl-l-cysteine (NAC), and its molecular structure and electronic properties in relation to the action of thiol and amine groups at different pH.


ChemPhysChem ◽  
2012 ◽  
Vol 13 (5) ◽  
pp. 1272-1281 ◽  
Author(s):  
Peiyang Zhu ◽  
Guochun Yang ◽  
Mohammad Reza Poopari ◽  
Zhi Bie ◽  
Yunjie Xu

1983 ◽  
Vol 38 (11-12) ◽  
pp. 951-959 ◽  
Author(s):  
C. Schamagl ◽  
E. Köst-Reyes ◽  
S. Schneider ◽  
H.-P. Köst ◽  
H. Scheer

The circular dichroism of bilipeptides from Spirulina geitleri phycocyanin is strongly solvent and pH dependent. Maximum optical activity has been observed in aqueous solutions containing urea (8 ᴍ). In aqueous buffer, a sign reversal occurred upon the change from neutral to acidic pH; in methanolic solutions shows the optical activity a strong pH dependence both with respect to sign and magnitude. These findings have been rationalized by the presence of chrom ophorepeptide interactions, which are minimized in the presence of urea. M olecular orbital calculations indicate that the observed sign reversal is not necessarily due to a reversal of the chirality of the entire chromophore, but may also result from more localized conform ational changes


1993 ◽  
Vol 76 (1) ◽  
pp. 95-97 ◽  
Author(s):  
Vittorio Crescenzi ◽  
Mariella Dentini ◽  
Sergio Maschio ◽  
Maurizio Segatori

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