These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.
Pubmed for Handhelds
PUBMED FOR HANDHELDS
Search MEDLINE/PubMed
Title: Selection of column dimensions and gradient conditions to maximize the peak-production rate in comprehensive off-line two-dimensional liquid chromatography using monolithic columns. Author: Eeltink S, Dolman S, Vivo-Truyols G, Schoenmakers P, Swart R, Ursem M, Desmet G. Journal: Anal Chem; 2010 Aug 15; 82(16):7015-20. PubMed ID: 20666432. Abstract: The peak-production rate (peak capacity per unit time) in comprehensive off-line two-dimensional liquid chromatography (LC/x/LC) was optimized for the separation of peptides using poly(styrene-co-divinylbenzene) monolithic columns in the reversed-phase (RP) mode. A first-dimension ((1)D) separation was performed on a monolithic column operating at a pH of 8, followed by sequential analysis of all the (1)D fractions on a monolithic column operating at a pH of 2. To obtain the highest peak-production rate, effects of column length, gradient duration, and sampling time were examined. RP/x/RP was performed at undersampling conditions using a short 10 min (1)D gradient. The peak-production rate was highest using a 50 mm long (2)D column applying an 8-10 min (2)D gradient time and was almost a factor of two higher than when a 250 mm monolithic column was used. The best way to obtain a higher peak-production rate in off-line LC/x/LC proved to be an increase in the number of (1)D fractions collected. Increasing the (2)D gradient time was less effective. The potential of the optimized RP/x/RP method is demonstrated by analyzing proteomics samples of various complexities. Finally, the trade-off between peak capacity and analysis time is discussed in quantitative terms for both one-dimensional RP gradient-elution chromatography and the off-line two-dimensional (RP/x/RP) approach. At the conditions applied, the RP/x/RP approach provided a higher peak-production rate than the (1)D-LC approach when collecting three (1)D fractions, which corresponds to a total analysis time of 60 min.[Abstract] [Full Text] [Related] [New Search]