Multiple-buffer-additive strategies for enhanced capillary electrophoretic separation of peptides

Robert P. Oda, Benjamin J. Madden, John C. Morris, Thomas C. Spelsberg, James P. Landers

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

A dodeca-peptide from the β-subunit of thyroid stimulating hormone (TSH) was used as a model system for developing "multiple-buffer-additive" strategies to effect the separation of structurally-similar peptides. A series of synthetic peptides included six peptides with identical amino acid composition and two with multiple alanine substitutions at selected positions. Those with identical amino acid composition included the native and reverse sequences of residues 101-112 of the β-TSH and four "computer-shuffled" amino acid sequences. Buffer additives such as acetonitrile (ACN), hexane sulfonic acid (HSA), and hexamethonium bromide (HxMBr), were shown to alter selectivity dramatically. HSA, an ion-pairing agent, and ACN, known to alter the hydrophobic environment of the solute, and HxMBr, which is thought to negate solute-wall interactions, are shown to independently effect only partial resolution of the mixture. It is shown that only with the proper combination of HSA and ACN are all mixture components resolved. These results re-affirm that CE selectivity may be altered by changes in buffer ionic strength or with the addition of HSA, but also show that further changes in selectivity can be achieved through alteration of buffer hydrophobicity. The observed changes in selectivity accompanying the addition of HSA and ACN may be due to differing electrophoretic mobilities resulting from nearest-neighbor effects or subtle differences in peptide secondary structure or solvation. This emphasizes the importance of employing multiple-buffer-additive strategies for effecting the resolution of peptide mixtures that are difficult to separate.

Original languageEnglish (US)
Pages (from-to)341-351
Number of pages11
JournalJournal of Chromatography A
Volume680
Issue number1
DOIs
StatePublished - Sep 30 1994

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Sulfonic Acids
Hexanes
Buffers
Peptides
Hexamethonium
Thyrotropin
Amino Acids
Electrophoretic mobility
Solvation
Hydrophobicity
Ionic strength
Chemical analysis
Hydrophobic and Hydrophilic Interactions
Alanine
Osmolar Concentration
Amino Acid Sequence
Substitution reactions
Ions
acetonitrile

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Multiple-buffer-additive strategies for enhanced capillary electrophoretic separation of peptides. / Oda, Robert P.; Madden, Benjamin J.; Morris, John C.; Spelsberg, Thomas C.; Landers, James P.

In: Journal of Chromatography A, Vol. 680, No. 1, 30.09.1994, p. 341-351.

Research output: Contribution to journalArticle

Oda, Robert P. ; Madden, Benjamin J. ; Morris, John C. ; Spelsberg, Thomas C. ; Landers, James P. / Multiple-buffer-additive strategies for enhanced capillary electrophoretic separation of peptides. In: Journal of Chromatography A. 1994 ; Vol. 680, No. 1. pp. 341-351.
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