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Melanin standard method: empirical formula 2.

M R Chedekel1, A B Ahene, L Zeise

  • 1Melan, Inc., Orland, California 95963.

Pigment Cell Research
|November 1, 1992
PubMed
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Researchers developed a mild melanin isolation method. This technique accurately characterizes the chromophoric backbone, revealing significant differences between various melanin sources.

Area of Science:

  • Biochemistry
  • Materials Science
  • Analytical Chemistry

Background:

  • Natural melanins consist of protein and chromophoric fractions.
  • Previous isolation methods used harsh protocols, damaging melanin structures.
  • Artifactual melanin preparations hinder accurate scientific study.

Purpose of the Study:

  • To develop a mild protocol for melanin isolation and purification.
  • To accurately characterize the chromophoric backbone of melanins.
  • To differentiate melanins from various sources.

Main Methods:

  • A mild isolation and purification protocol considering melanin's particulate nature and chromophore stability.
  • Mathematical factoring of quantitative amino acid data with elemental analysis.

Related Experiment Videos

  • Empirical formula determination of the chromophoric backbone.

    • Main Results:

    • Melanins from different sources exhibit distinct amino acid compositions and contents.
    • Significant variations in molar C/N ratios and empirical formulae were observed.
    • The method successfully differentiated melanins from human hair, Sepia officinalis, synthetic dopa-melanin, and chicken feathers.

    Conclusions:

    • The developed mild protocol provides artifact-free melanin preparations.
    • This method allows for accurate chemical and physical characterization of melanins.
    • Significant structural heterogeneity exists among natural and synthetic melanins.