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- W2076136461 abstract "Iminodiacetic Acid (IDA) was immobilised on silica supports using either activated chromatographic supports or silanes carrying IDA in ω-position to silicium. Through reaction of IDA with glycidoxypropyltrimethoxysilane (GLYMO) before immobilization, a new and simple method is introduced which provides a metal chelate affinity sorbent of both high capacity for Cu(II) (28 μmol/ml) and almost identical chromatographic characteristics to soft gel metal chelate affinity sorbents. By immobilization of IDA through n-alkyl spacers exclusive of an epoxy group a different chemical neighborhood to the chelator is obtained. These metal chelate sorbents demonstrated higher capacities for Cu(II) (39 μmol/ml). The selectivity for lysine was higher, for histidine lower, compared to epoxy-immobilized IDA chelates. It is concluded that the β-hydroxyl group, evolved during reaction with epoxy groups, is integrated with the metal chelate, thus forming a N-(hydroxyethyl)iminodiacetic acid (HEIDA). The most distinct chromatographic behaviour was observed with CDI-immobilised IDA chelates, which displayed higher selectivity for acidic amino acids than common IDA chelates." @default.
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- W2076136461 date "1994-06-01" @default.
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- W2076136461 title "Silica-based metal chelate affinity sorbents I. Preparation and characterization of iminodiacetic acid affinity sorbents prepared via different immobilization techniques" @default.
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- W2076136461 doi "https://doi.org/10.1016/0021-9673(94)80592-x" @default.
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