Ultrafast nonradiative relaxation dynamics of eumelanin

Article Abstract:

The primary photodynamics of eumelanin from Sepia officinalis following UV-A excitation is examined using the degenerate pump-probe femtosecond spectroscopy. It could be concluded that the repopulation of the ground electronic state is the dominant nonradiative process in eumelanin and the time constants revealed by the nonexponential decays of the emission.

User Contributions:

Comment about this article or add new information about this topic:

Comment:  (50-4000 characters)

Name:

E-mail:

Security Code:

Comparison of the ultrafast absorption dynamics of eumelanin and pheomelanin

Article Abstract:

The transient absorption spectra in the visible region and their decay dynamics following excitation of synthetic pheomelanin and Sepia eumelanin at 303 nm are compared. An enhanced photoreactivity of the red melanin, pheomelanin compared to the black melanin, eumelanin is invoked to explain why fair skinned individuals are more prone to skin cancers.

User Contributions:

Comment about this article or add new information about this topic:

Comment:  (50-4000 characters)

Name:

E-mail:

Security Code:

Binding of ochratoxin a derivatives to human serum albumin

Article Abstract:

Ochratoxins are fungal metabolites known to contaminate human and animal feed. By using optical spectroscopy, the binding of three Ochratoxin A (OTA) derivatives ochratoxin B (OTB), ochratoxin hydroquinone (OHQ), and O-methylated OTA(MOA) to HSA is examined.

User Contributions:

Comment about this article or add new information about this topic:

Comment:  (50-4000 characters)

Name:

E-mail:

Security Code: