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Opiomelanins synthesis and properties.

M A Rosei1

  • 1Dipartimento di Scienze Biochimiche, Università degli Studi La Sapienza, Roma, Italy. marianna.rosei@uniroma1.it

Histology and Histopathology
|August 21, 2001
PubMed
Summary

Opiomelanins, novel synthetic pigments from opioid peptides, are soluble and paramagnetic. Their unique peptide structure influences electron transfer, offering new possibilities in pigment research.

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Fluorescence properties of melanins from opioid peptides.

Archives of biochemistry and biophysics·1999

Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Biochemistry

Background:

  • Melanins are natural pigments with diverse functions.
  • Synthetic melanins offer tunable properties.
  • Opioid peptides present a novel precursor for pigment synthesis.

Purpose of the Study:

  • To synthesize and characterize a new class of melanin-like pigments, opiomelanins.
  • To investigate the physicochemical properties of opiomelanins, including solubility, paramagnetism, and spectral characteristics.
  • To explore the influence of the peptide moiety on the functional properties of opiomelanins, such as electron transfer capabilities.

Main Methods:

  • Tyrosinase-catalyzed oxidation of opioid peptides.
  • Spectroscopic analysis (EPR, UV-Vis, fluorescence).
  • Solubility tests in hydrophilic media.
  • Assessment of NADH oxidation potential.
  • Chemical treatments (acid hydrolysis, H2O2) and photodegradation studies.

Main Results:

  • Opiomelanins are fully soluble in hydrophilic media due to their peptide component.
  • EPR spectra confirm paramagnetism, similar to dopamelanin.
  • UV-Vis spectra show an absorption band at 330 nm, sensitive to hydrolysis and light.
  • Fluorescence emission peaks at 440 nm and 520 nm.
  • Electron transfer properties vary; Tyr-Gly-melanin oxidizes NADH, while leu-enkephalin-melanin does not.
  • Pheoopiomelanins were synthesized via cysteine incorporation and subsequent oxidation.

Conclusions:

  • Opiomelanins represent a novel class of synthetic pigments with unique solubility and spectral properties.
  • The peptide moiety significantly influences the functional characteristics, including electron transfer.
  • Opiomelanins demonstrate potential for applications where tunable pigment properties are desired.

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