Monolithic silica rods grafted with thermoresponsive anionic polymer brushes for high-speed separation of basic biomolecules and peptides.

Abstract:

:Thermoresponsive anionic copolymer brushes, poly(N-isopropylacrylamide-co-acrylic acid-co-tert-butylacrylamide) [P(IPAAm-co-AAc-co-tBAAm)], were grafted onto a monolithic silica rod column through surface-initiated atom-transfer radical polymerization (ATRP) to prepare an effective thermoresponsive anionic chromatography matrix. An ATRP initiator was attached to the rod surface. N-Isopropylacrylamide (IPAAm), tert-butyl acrylate (tBA), tert-butylacrylamide (tBAAm), and the ATRP catalyst CuCl/CuCl2/tris[2-(N,N-dimethylamino)ethyl]amine were dissolved in 2-propanol, and the reaction mixture was pumped into the initiator-modified column. After grafting P(IPAAm-co-tBA-co-tBAAm) on the monolithic silica surfaces, deprotection of the tert-butyl group of tBA was performed. Chromatographic analysis showed that the prepared column was able to separate catecholamine derivatives and angiotensin subtypes within a shorter analysis time (5 min) than a silica-bead-packed column modified with the same copolymer brush could. These results indicated that the prepared copolymer-modified monolithic silica rod column may be a promising bioanalytical and bioseparation tool for rapid analysis of basic bioactive compounds and peptides.

journal_name

Biomacromolecules

journal_title

Biomacromolecules

authors

Nagase K,Kobayashi J,Kikuchi A,Akiyama Y,Kanazawa H,Okano T

doi

10.1021/bm401779r

subject

Has Abstract

pub_date

2014-04-14 00:00:00

pages

1204-15

issue

4

eissn

1525-7797

issn

1526-4602

journal_volume

15

pub_type

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