DSA: A new internal standard for NMR studies of cationic peptides

ORGN 492

James S. Nowick, Omid Khakshoor, Mehrnoosh Hashemzadeh, and Justin O. Brower. Department of Chemistry, University of California, Irvine, 4126 Natural Sciences 1, Irvine, CA 92697-2025
The widely used internal standard for NMR studies in aqueous solution DSS (sodium 4,4-dimethyl-4-silapentane-1-sulfonate) can interact with cationic peptides, diminishing its value for such studies. This paper describes DSA (4,4-dimethyl-4-silapentane-1-ammonium trifluoroacetate) as a new internal standard that does not suffer from this problem. Examples of the superiority of DSA from our recent publication [Org. Lett. 2003, 5, 3511-3513] and additional examples will be presented. Free samples of DSA are available to principal investigators upon request by e-mail to jsnowick@uci.edu.

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