NDLI: Supramolecular Interaction of Two Tryptophans with p-sulfonated calix[4,6,8]arene

Content Provider	Springer Nature Link
Author	Pang, Tao Tao Liu, Hai Long Du, Li Ming Chang, Yin Xia Fu, Yun Long
Copyright Year	2013
Abstract	The complex characteristics of p-sulfonated calix[n]arene (SCnA) and two tryptophans N-[(tert-butoxy) carbonyl]-tryptophan (trp-A) and N-carbobenzoxy-tryptophane (trp-B) were examined through various techniques. Spectrofluorimetry was performed at different temperatures to determine the stability constants and evaluate the thermodynamic parameters of the two complexes. The effect of pH on complex formation was estimated. According to the fluorescence data, the assumption about the steric hindrance of the tert-butyl group of trp-A and the phenyl group of trp-B was put forward. $^{1}$H NMR was also performed to determine the binding interaction mechanism. Results showed that the indole benzene rings of the two tryptophans partly penetrated into the cavity of p-sulfonated calix[n]arene. The shift in Ha, Hb and Hc, Hd positions became more significant as the number of phenolic units of the calixarene ring increased. Molecular modeling of the complexes elucidated the assumption about the steric hindrance of the tert-butyl group of trp-A and the phenyl group of trp-B. These observations of molecular modeling computation are consistent with previous fluorescence data and $^{1}$H NMR results.
Starting Page	143
Ending Page	152
Page Count	10
File Format	PDF
ISSN	10530509
Journal	Journal of Fluorescence
Volume Number	24
Issue Number	1
e-ISSN	15734994
Language	English
Publisher	Springer US
Publisher Date	2013-07-31
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Spectrofluorimetry p-sulfonated calix[n]arene N-[(tert-butoxy) carbonyl-tryptophan N-carbobenzoxy-tryptophane Molecular modeling computation Biomedicine general Biophysics and Biological Physics Biotechnology Biochemistry Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Sociology and Political Science Spectroscopy Law Biochemistry Clinical Biochemistry Clinical Psychology

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