ISSN:0935-6304    

DOI:10.1002/jhrc.1240030202

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

年代:1980

数据来源: WILEY

摘要:

AbstractThe labelled drug [14C] phenytoin was injected into an all‐glass chromatographic system to determine adsorption on various system parts. It appeared that 10 to 20% of the amount injected did not elute. Severity of adsorption as measured from lasting radioactivity was not anticipated from peak shape or calibration curve

ISSN:0935-6304    

DOI:10.1002/jhrc.1240030203

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

年代:1980

数据来源: WILEY

摘要:

AbstractThis paper shows how simply and yet very rapidly fatty acid esters of monohydric alcohols, but particularly partial and full fatty acid esters of fully hydric alcohols can be separated and determined by means of high‐pressure liquid chromatography on LiChrosorb RP‐8 with methanol/water. We have separated quantitatively the methylesters of the fatty acids C8:0to C22:0and C24:0, the i‐propyl‐, i‐butyl‐, n‐hexyl‐ and i‐octyl‐esters of the even‐numbered fatty acids C8:0to C18:0, mono‐ and difatty acid esters of the 1,3‐bis‐(2‐hydroxyethyl)‐5,5‐dimethyl‐hydantoin, mono‐, di‐ and triesters of the trimethylolpropane as well as

ISSN:0935-6304    

DOI:10.1002/jhrc.1240030204

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

年代:1980

数据来源: WILEY

摘要:

AbstractThe purpose of the studies being carried out is to find some regularities of a general character which determine the relationship between the structures of the chromatographed substances and the composition of the mobile phase, i.e., between the log of the partition coefficient of the sample (Az), the K1‐values which characterize the adsorption equilibrium of component “1” in a given chromatographic system, the structures of the mobile phase components and the structures of the substances being chromatographed. This paper deals with the relationship between the Azand K1parameters and the structure of naphthalene and a number of its derivatives. It has been shown that there is a close relationship between the kind, size, frequency and site of the substituent on the one hand and the Azand K1values on the other. In order to eliminate the possibility of unwanted side effects, the investigations were carried exclusively using non‐active binary mobile phases of the type N + N or N + /B/. From these investigations, a comparison between the parameter Azand the surface of adsorbed molecules (As) was also p

ISSN:0935-6304    

DOI:10.1002/jhrc.1240030205

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

年代:1980

数据来源: WILEY

ISSN:0935-6304    

DOI:10.1002/jhrc.1240030206

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

年代:1980

数据来源: WILEY

ISSN:0935-6304    

DOI:10.1002/jhrc.1240030207

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

年代:1980

数据来源: WILEY

摘要:

AbstractBy the use of a wide‐bore WCOT capillary column, it was possible to obtain the first on‐the‐fly GC/FT‐IR spectra with a WCOT column. This wide‐bore WCOT column gave improved separation, as compared to a SCOT column, and yielded identifiable infrared spectra for a re

ISSN:0935-6304    

DOI:10.1002/jhrc.1240030208

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

年代:1980

数据来源: WILEY

摘要:

AbstractComplete separation of the TMS derivatives of histamine, 1‐methyl histamine and 3‐methyl histamine was achieved in two minutes in a 7 m × 0.25 mm column coated with SP 2250. Using NPD, histamine was detectable at levels as low as 20 pg. This offers a rapid, sensitive procedure with potential for clinical diagnosis and food anal

ISSN:0935-6304    

DOI:10.1002/jhrc.1240030209

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

年代:1980

数据来源: WILEY

ISSN:0935-6304    

DOI:10.1002/jhrc.1240030210

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

年代:1980

数据来源: WILEY

ISSN:0935-6304    

DOI:10.1002/jhrc.1240030211

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

年代:1980

数据来源: WILEY