sfye 2007/11/25
直接测应该不行,可以参考附件的文献 http://pubs.acs.org/cgi-bin/abstract.cgi/ancham/2003/75/i23/abs/ac034684f.html [~70890~] 斑竹:本文件已丢失,无法验证。 [~71563~] Anal. Chem., 75 (23), 6455 -6462, 2003. 10.1021/ac034684f S0003-2700(03)04684-5 Web Release Date: October 17, 2003 Copyright © 2003 American Chemical Society Determination of Enantiomeric Compositions of Amino Acids by Near-Infrared Spectrometry through Complexation with Carbohydrate Chieu D. Tran,* Victor I. Grishko, and Daniel Oliveira Department of Chemistry, Marquette University, P.O. Box 1881, Milwaukee, Wisconsin 53201 Received for review June 24, 2003. Accepted September 10, 2003. Abstract: A new method has been developed for the determination of enantiomeric compositions of a variety of compounds. The method is based on the use of the near-infrared technique to measure diastereomeric interactions between an added carbohydrate compound with both enantiomeric forms of an analyte followed by partial least-squares analysis of the data. The fact that the method works well with all three macrocyclic carbohydrates with different cavity size (i.e., -, -, and -cyclodextrin) as well as with sucrose, which is a linear carbohydrate, clearly demonstrates that it is not necessary to have inclusion complex formation in order to produce effective diastereomeric interactions. Rather, a simple adsorption of the analyte onto a carbohydrate is sufficient. Since inclusion complex formation is not a requisite, this method is not limited to the amino acid studies here but is rather universal and sensitive as it can, in principle, be used to determine enantiomeric compositions for all types of compounds with only microgram concentration and enantiomeric excess as low as 1.5%, in water or in a mixture of water and organic solvent. Furthermore, it does not rely on the use of rather expensive carbohydrates such as cyclodextrins but is equally as effective even with a simple and inexpensive carbohydrate such as sucrose
fzy 2007/11/26
从理论上应该是可以的。只是操作起来可能会比较麻烦。我这边也准备扩展近红外的功能测残溶。你可以咨询你的仪器供应商,向他们寻求技术援助!供参考!
闲鹤野云 2007/12/07
[quote]原文由 [B]jxdwdeng[/B] 发表: OK.十九楼的观点我不同意。这里讨论的旋光度可测否,葡萄糖只是个代表性的例子。如果测葡萄糖含量,根本没有计论的必要,地球人都知道,只要含量不是太小就可以测。[/quote] 每种物品的旋光度不同,能够以间接方法测定某种物质的旋光度,并不代表一定可以测定另外一种物质的旋光度,欢迎大家讨论。
jxdwdeng 2007/12/06
OK.十九楼的观点我不同意。这里讨论的旋光度可测否,葡萄糖只是个代表性的例子。如果测葡萄糖含量,根本没有计论的必要,地球人都知道,只要含量不是太小就可以测。
wcx972 2007/11/23
[em0707] 尝试过用近红外测含量和水,但没有做过比旋度
sfye
第9楼2007/11/25
直接测应该不行,可以参考附件的文献
http://pubs.acs.org/cgi-bin/abstract.cgi/ancham/2003/75/i23/abs/ac034684f.html
[~70890~]
斑竹:本文件已丢失,无法验证。
[~71563~]
Anal. Chem., 75 (23), 6455 -6462, 2003. 10.1021/ac034684f S0003-2700(03)04684-5
Web Release Date: October 17, 2003
Copyright © 2003 American Chemical Society
Determination of Enantiomeric Compositions of Amino Acids by Near-Infrared Spectrometry through Complexation with Carbohydrate
Chieu D. Tran,* Victor I. Grishko, and Daniel Oliveira
Department of Chemistry, Marquette University, P.O. Box 1881, Milwaukee, Wisconsin 53201
Received for review June 24, 2003. Accepted September 10, 2003.
Abstract:
A new method has been developed for the determination of enantiomeric compositions of a variety of compounds. The method is based on the use of the near-infrared technique to measure diastereomeric interactions between an added carbohydrate compound with both enantiomeric forms of an analyte followed by partial least-squares analysis of the data. The fact that the method works well with all three macrocyclic carbohydrates with different cavity size (i.e., -, -, and -cyclodextrin) as well as with sucrose, which is a linear carbohydrate, clearly demonstrates that it is not necessary to have inclusion complex formation in order to produce effective diastereomeric interactions. Rather, a simple adsorption of the analyte onto a carbohydrate is sufficient. Since inclusion complex formation is not a requisite, this method is not limited to the amino acid studies here but is rather universal and sensitive as it can, in principle, be used to determine enantiomeric compositions for all types of compounds with only microgram concentration and enantiomeric excess as low as 1.5%, in water or in a mixture of water and organic solvent. Furthermore, it does not rely on the use of rather expensive carbohydrates such as cyclodextrins but is equally as effective even with a simple and inexpensive carbohydrate such as sucrose