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Peptide synthesis with carbodiimide.

J Rebek, D Feitler

    International Journal of Peptide and Protein Research
    |January 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    A new isotope dilution assay quantifies racemization in acid couplings. Carbodiimide-mediated synthesis shows low racemization (0.01-0.1%) in solution and 0.03% on solid phase.

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    Area of Science:

    • Organic Chemistry
    • Analytical Chemistry
    • Biochemistry

    Background:

    • Racemization is a critical issue in peptide synthesis, potentially compromising product purity and biological activity.
    • Accurate quantification of racemization is essential for developing optimized coupling protocols.

    Purpose of the Study:

    • To develop and validate an isotope dilution assay for precise measurement of racemization during acid couplings.
    • To evaluate racemization levels in carbodiimide-mediated synthesis using a model system.

    Main Methods:

    • Development of an isotope dilution assay.
    • Application of the assay to carbodiimide-mediated coupling of t-BOC-L-phenylalanine with glycine derivatives.
    • Analysis of racemization in both solution and solid-phase synthesis.

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    Main Results:

    • The developed assay accurately quantifies racemization during acid couplings.
    • Racemization in solution-phase carbodiimide-mediated synthesis ranged from 0.01% to 0.1%, dependent on reagent concentrations.
    • Solid-phase synthesis using a typical carbodiimide-mediated coupling method exhibited 0.03% racemization.

    Conclusions:

    • The isotope dilution assay provides a reliable method for assessing racemization in peptide synthesis.
    • Carbodiimide-mediated couplings, under the conditions tested, result in minimal racemization, particularly in solid-phase applications.
    • The findings support the use of carbodiimide-mediated methods for efficient and stereochemically controlled peptide synthesis.