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Related Experiment Video

Updated: Jul 17, 2026

Disentangling High Strength Copolymer Aramid Fibers to Enable the Determination of Their Mechanical Properties

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Published on: September 1, 2018

Metal binding characterization and conformational studies using Raman microscopy of resin-bound poly(aspartic acid).

Jacqueline L Stair¹, James A Holcombe

¹Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, Texas 78712, USA.

Analytical Chemistry

|January 26, 2007

Summary

Immobilized polyaspartic acid (PLAsp) effectively binds various metal ions. Longer PLAsp chains show conformational changes aiding metal release, unlike shorter chains which rely on H+ displacement.

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OaAEP1-Mediated Enzymatic Synthesis and Immobilization of Polymerized Protein for Single-Molecule Force Spectroscopy

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Area of Science:

Polymer Chemistry
Materials Science
Biochemistry

Background:

Polyaspartic acid (PLAsp) is a versatile polymer with potential applications in metal ion binding.
Understanding the influence of PLAsp chain length on metal binding and release is crucial for optimizing its use.
Immobilization of polymers on solid supports can enhance their performance in separation and purification processes.

Purpose of the Study:

To investigate the metal binding capacities, stability constants, and secondary structure of immobilized polyaspartic acid (PLAsp) with varying chain lengths (n=6, 20, 30).
To evaluate the binding and release mechanisms of specific divalent metal ions (Mg2+, Co2+, Cd2+, Ni2+) by immobilized PLAsp.
To correlate the secondary structure changes of PLAsp with metal binding and release processes.

Main Methods:

Synthesis and immobilization of polyaspartic acid (PLAsp) with different chain lengths (n=6, 20, 30) onto TentaGel resin.
Metal binding evaluation using packed microcolumn breakthrough curves and flame atomic absorption spectrophotometry (FAAS).
Determination of conditional stability constants via single metal binding isotherms and secondary structure analysis using Raman microscopy.

Main Results:

Metal binding capacities increased with PLAsp chain length, reaching up to 3710 μmol/g for the 30-mer.
All tested PLAsp lengths (6, 20, 30) demonstrated efficient metal binding, with 2-3 residues per metal ion.
Binding strength decreased with increasing PLAsp chain length, while longer peptides exhibited conformational changes (beta-sheets, alpha-helices) during acid-induced metal release.

Conclusions:

Immobilized PLAsp exhibits significant metal binding capacities, influenced by chain length.
Metal release from longer PLAsp chains is facilitated by conformational changes, whereas shorter chains release metals via H+ displacement.
The study provides insights into the structure-property relationships of PLAsp for metal ion management applications.