What is the unidentified peak that might be present between cystine and lysine in the AccQ•Tag Ultra UPLC Total Solution chromatography method? - WKB91840
Article number: 91840
ENVIRONMENT
- Amino acid analysis
- AccQ•Tag Ultra
ANSWER
The unidentified peak visible in the AccQ•Tag Ultra Total Solution chromatography method is di-derivatized cystine, which is more likely to be present in pure protein hydrolysates.
ADDITIONAL INFORMATION
For additional information, see Can the AccQ-Tag di-derivatized cystine be quantified? and section 6.5.2 and Figure 14 of the Comprehensive Guide to Hydrolysis and Amino Acid Analysis.