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Related Experiment Videos

Melanin standard method: titrimetric analysis.

L Zeise1, M R Chedekel

  • 1Department of Chemistry, California State University, Chico 95929.

Pigment Cell Research
|November 1, 1992
PubMed
Summary
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This study quantifies bioavailable carboxylic acid groups in Sepia melanin, a natural eumelanin standard. Results provide crucial data on melanin

Area of Science:

  • Biochemistry
  • Materials Science

Background:

  • Sepia melanin from Sepia officinalis is a proposed standard for natural eumelanin.
  • A mild isolation and purification protocol for Sepia melanin exists.

Purpose of the Study:

  • To quantify the bioavailable carboxylic acid groups in melanin particles.
  • To express bioavailability as microequivalents of carboxy group per gram of melanin.

Main Methods:

  • Utilized Sepia melanin in a heterogeneous slurry within a nonaqueous system.
  • Employed a standard acidic titrant and an automatic titrator in equilibrium titration mode.
  • Characterized and quantified carboxy group content in Sepia melanins and other common melanins.

Main Results:

  • Quantified bioavailable carboxylic acid groups in Sepia melanin particles.

Related Experiment Videos

  • Determined carboxy group content for Sepia melanins and other purified melanins.

    • Conclusions:

    • Established a method for quantifying bioavailable carboxylic acid groups in melanin.
    • Provided essential data for understanding melanin's chemical properties and bioavailability.