TN50: Determination of the Amino Acid Content of Peptides by AAA-Direct

Instrument Type: IC

This Technical Note describes the peptide hydrolysis procedures that lead to successful determinations of amino acid composition using AAA-Direct. Results for the amino analysis of two peptides, Melanocyte Stimulating Hormone (MSH) and Luteinizing Hormone-Releasing Hormone (LH-RH), using both hydrochloric acid and methanesulfonic acid (MSA) as hydrolyzing reagents are presented to demonstrate the performance of this method.

AN161: Determination of Metal Cyanide Complexes by Ion Chromatography with On-Line Sample Preconcentration and UV Absorbance Detection.

Instrument Type: IC

In this application note, an improved IC method is described for the determination of metal cyanide complexes in environmental waters. The metal cyanide complexes of silver, gold, copper, nickel, iron, and cobalt are separated on an anion-exchange column and quantified by measuring their absorbance at 215 nm. Sensitivity for most of the metal cyanide complexes is improved by over two orders of magnitude, compared to a direct injection, by preconcentrating metal cyanide complexes from a large sample volume onto a trap column before separation.