Physics and Materials Chemistry
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Physics and Materials Chemistry. 2015, 3(2), 25-29
DOI: 10.12691/pmc-3-2-2
Open AccessArticle

Fourier Transform Infrared Spectroscopy for Sepia Melanin

Agnes Mbonyiryivuze1, 2, , Bonex Mwakikunga1, 3, Simon Mokhotjwa Dhlamini1, 4 and Malik Maaza1, 2

1UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa, Pretoria-South Africa

2Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, Cape Town, South Africa

3CSIR- National Centre for Nano-Structured Materials, Pretoria, South Africa

4Department of Physics, Florida Research Centre, University of South Africa, Florida-South Africa

Pub. Date: November 19, 2015

Cite this paper:
Agnes Mbonyiryivuze, Bonex Mwakikunga, Simon Mokhotjwa Dhlamini and Malik Maaza. Fourier Transform Infrared Spectroscopy for Sepia Melanin. Physics and Materials Chemistry. 2015; 3(2):25-29. doi: 10.12691/pmc-3-2-2

Abstract

Melanin is of interest as a model system of understanding disorder in biological systems. The biological functionality of melanin depends on disorder which is considered as its essential part. This property distinguishes melanin from other much more intensively studied biomolecule systems such as nucleic acid, proteins and carbohydrates. Melanins have been reported to have a diverse number of functions in the biosystem, including photosensitization, metal ion chelation, photoprotection to absorb a broad range of electromagnetic radiation, antibiotic, thermoregulation. Melanins are found all over the body from the skin and blood to the nervous system but the role of melanin in all these system is unclear. FTIR spectroscopy technique is usually one of the most preferred techniques used to give a correct assignment of the observed spectral characteristic of functional groups corresponding to different absorption bands which are responsible of the absorption. FTIR is the characterization technique which is both rapid, non-destructive and requires small sized samples. In the material to be analysed, chemical bonds vibrate at a characteristic frequency representative of their structure, bond angle and length. FTIR spectrometer is important for the interpretation of the structure, binding capacity, affinity and sites of metal ions in melanin. These are important factors for better understanding the metals melanin complexity and its consequences. The analysis of sepia melanin by FTIR reveals that there is existence of functional groups that can be responsible for the binding cites of different metallic ions leading to many new applications of sepia melanin.

Keywords:
FTIR melanin sepia melanin Sepia Officinalis

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