摘要:

AbstractAn enantiomeric mixture of amino acids is derivatized to give the respectiveN(O)‐perfluoroacyl alkyl esters which can be resolved directly by gas chromatography on a Chirasil‐Val capillary column. The retention times, resolution numbers, and elution order are repor

ISSN:0935-6304    

DOI:10.1002/jhrc.1240041102

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1981

数据来源: WILEY

摘要:

AbstractNew chiral polymers have been prepared by conversion of cyano groups of polysiloxanes XE‐60 and OV‐225 into carboxylic groups and subsequent coupling to give the respectiveS‐valine‐R‐α‐phenyl‐ethyl amide. In contrast to the corresponding stationary phases withS‐α‐phenylethyl amide groups, which have been used for the resoultion of trifluoroacetylated hexose derivatives, the new phase show high enantioselectivity for pentose and 6‐de

ISSN:0935-6304    

DOI:10.1002/jhrc.1240041103

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1981

数据来源: WILEY

ISSN:0935-6304    

DOI:10.1002/jhrc.1240041104

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1981

数据来源: WILEY

摘要:

AbstractA rapid scanning, two‐dimensional fluorometer has been used to obtain Emission‐Excitation Matrices (EEMs) of the effluent of an HPLC column. These spectra, obtained “on the fly”, provide qualitative as well as quantitative information about unknown samples. An in‐depth discussion of the instrumentation developed and an account of data processing alternatives are

ISSN:0935-6304    

DOI:10.1002/jhrc.1240041105

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1981

数据来源: WILEY

摘要:

AbstractUsing a specially designed column system, we have systematically investigated the effect of mobile phase velocity on column efficiency. The performance of small bore columns operated at different linear velocities of mobile phase was examined for three different types of injection system. Using the value of H∞/u or n∞/t rºas a criterion of a high speed separation, we calculated values of n/t rºfor different solutes according to the equation\documentclass{article}\pagestyle{empty}\begin{document}$ {{\rm n}\mathord{\left/ {\vphantom {{\rm n} {{\rm t}_{\rm r}^ \circ }}}\right. \kern-\nulldelimiterspace} {{\rm t}_{\rm r}^ \circ }} = {{{\rm n}^\infty } \mathord{\left/ {\vphantom {{{\rm n}^\infty } {{\rm t}_{\rm r}^ \circ }}} \right. \kern-\nulldelimiterspace} {{\rm t}_{\rm r}^ \circ }}\left({\frac{{1 + {\rm k'}}}{{{\rm k' + }\beta }}} \right)^2 $\end{document}; the results obtained are in agreement with the experimentally determined values. These systematic investigations culminated in the separation of seven compounds in less than 10 s; the respective chromatogram

ISSN:0935-6304    

DOI:10.1002/jhrc.1240041106

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1981

数据来源: WILEY

ISSN:0935-6304    

DOI:10.1002/jhrc.1240041107

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1981

数据来源: WILEY

ISSN:0935-6304    

DOI:10.1002/jhrc.1240041108

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1981

数据来源: WILEY

ISSN:0935-6304    

DOI:10.1002/jhrc.1240041109

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1981

数据来源: WILEY

ISSN:0935-6304    

DOI:10.1002/jhrc.1240041110

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1981

数据来源: WILEY

ISSN:0935-6304    

DOI:10.1002/jhrc.1240041111

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1981

数据来源: WILEY