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Back Cover: Development of a low flow‐resistive charged nanoporous membrane in a microchip for fast electropreconcentration
Author(s) -
Chun Honggu
Publication year - 2018
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.201870142
Subject(s) - nanoporous , valency , membrane , surface charge , materials science , spark plug , analytical chemistry (journal) , ionic strength , nanopore , resistive touchscreen , chemical engineering , chemistry , chromatography , nanotechnology , thermodynamics , physics , philosophy , linguistics , biochemistry , engineering , aqueous solution , electrical engineering
DOI: 10.1002/elps.201800093 The cover picture shows the anion‐selective electropreconcentration process of fluorescein (green, charge of −2) and TRITC‐albumin (red, charge of −10) using a poly‐SS membrane as the nanoporous charge‐selective filter. The electropreconcentration only concentrates same charged analytes as the nano‐filter surface charge. One of the inevitable phenomena due to the charge‐selectivity is the limit in maximum concentration of the preconcentrated sample plug, which is limited by the counter‐ionic strength of the buffer. Although all experimental conditions were identical, the TRITC‐albumin plug grows faster (∽5 times) because the higher valency results in lower maximum concentration.