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Probing near-infrared photorelaxation pathways in eumelanins and pheomelanins.

Publication ,  Journal Article
Piletic, IR; Matthews, TE; Warren, WS
Published in: The journal of physical chemistry. A
November 2010

Ultraviolet-visible spectroscopy readily discerns the two types of melanin pigments (eumelanin and pheomelanin), although fundamental details regarding the optical properties and pigment heterogeneity are more difficult to disentangle via analysis of the broad featureless absorption spectrum alone. We employed nonlinear transient absorption spectroscopy to study different melanin pigments at near-infrared wavelengths. Excited-state absorption, ground-state depletion, and stimulated emission signal contributions were distinguished for natural and synthetic eumelanins and pheomelanins. A starker contrast among the pigments is observed in the nonlinear excitation regime because they all exhibit distinct transient absorptive amplitudes, phase shifts, and nonexponential population dynamics spanning the femtosecond-nanosecond range. In this manner, different pigments within the pheomelanin subclass were distinguished in synthetic and human hair samples. These results highlight the potential of nonlinear spectroscopies to deliver an in situ analysis of natural melanins in tissue that are otherwise difficult to extract and purify.

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Published In

The journal of physical chemistry. A

DOI

EISSN

1520-5215

ISSN

1089-5639

Publication Date

November 2010

Volume

114

Issue

43

Start / End Page

11483 / 11491

Related Subject Headings

  • Spectrophotometry, Ultraviolet
  • Sepia
  • Quantum Theory
  • Melanins
  • Humans
  • Hair
  • Animals
  • 5102 Atomic, molecular and optical physics
  • 3407 Theoretical and computational chemistry
  • 3406 Physical chemistry
 

Citation

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Piletic, I. R., Matthews, T. E., & Warren, W. S. (2010). Probing near-infrared photorelaxation pathways in eumelanins and pheomelanins. The Journal of Physical Chemistry. A, 114(43), 11483–11491. https://doi.org/10.1021/jp103608d
Piletic, Ivan R., Thomas E. Matthews, and Warren S. Warren. “Probing near-infrared photorelaxation pathways in eumelanins and pheomelanins.The Journal of Physical Chemistry. A 114, no. 43 (November 2010): 11483–91. https://doi.org/10.1021/jp103608d.
Piletic IR, Matthews TE, Warren WS. Probing near-infrared photorelaxation pathways in eumelanins and pheomelanins. The journal of physical chemistry A. 2010 Nov;114(43):11483–91.
Piletic, Ivan R., et al. “Probing near-infrared photorelaxation pathways in eumelanins and pheomelanins.The Journal of Physical Chemistry. A, vol. 114, no. 43, Nov. 2010, pp. 11483–91. Epmc, doi:10.1021/jp103608d.
Piletic IR, Matthews TE, Warren WS. Probing near-infrared photorelaxation pathways in eumelanins and pheomelanins. The journal of physical chemistry A. 2010 Nov;114(43):11483–11491.
Journal cover image

Published In

The journal of physical chemistry. A

DOI

EISSN

1520-5215

ISSN

1089-5639

Publication Date

November 2010

Volume

114

Issue

43

Start / End Page

11483 / 11491

Related Subject Headings

  • Spectrophotometry, Ultraviolet
  • Sepia
  • Quantum Theory
  • Melanins
  • Humans
  • Hair
  • Animals
  • 5102 Atomic, molecular and optical physics
  • 3407 Theoretical and computational chemistry
  • 3406 Physical chemistry