Separation type: Bridge Ion Separation Technology, or BIST™ by SIELC Technologies
Polylysine includes a large group of similar polymers with various uses. Some are used as food preservatives, while others are used for drug delivery in pharmaceuticals. Polymers with charged monomeric units, such as polylysine, are often difficult to separate using typical ion-exchange chromatography due to very strong and often irreversible interactions with the oppositely charged column surface. Therefore, an extremely high concentration of the buffer, up to several molar, is usually needed to facilitate an ion-exchange process. This high buffer concentration, however, is not desirable because of the significantly increased viscosity of the mobile phase and the salt formation in the pump components. With BIST™, these polymers can be separated and retained with relatively weak buffers (in the mM regime) and a fairly simple gradient. Using this new and unique analysis method, polylysine can be retained and UV detected at 210 nm.
Column | BIST B+, 4.6×50 mm, 5 µm, 100A |
Mobile Phase | Gradient MeCN |
Buffer | H2SO4 – 0.2% |
Flow Rate | 1.0 ml/min |
Detection | UV 205 nm |
Peak Retention Time | 2.9 min |
Class of Compounds | Peptide, Homopolypeptide |
Analyzing Compounds | Polylysine |
SIELC Technologies’ BIST™ Columns are a new and simple way to achieve many separations that are traditionally difficult or impossible to achieve with any other HPLC columns currently on the market! When used with our BIST™ mobile phases, these ion exchange columns can generate very strong retention of analytes that have the same charge polarity as the stationary phase, unlocking new chromatography applications that were previously too difficult to achieve.
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