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Natural Product Research
Formerly Natural Product Letters
Volume 30, 2016 - Issue 8
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Short Communications

Redox activity of melanin from the ink sac of Sepia officinalis by means of colorimetric oxidative assay

Pathomthat Srisuk3B’s Research Group – Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, University of Minho, Guimarães, Portugal;PT Government Associate Laboratory, ICVS/3B’s, Guimarães, Portugal;Faculty of Pharmaceutical Sciences, Khon Kaen University, Khon Kaen, Thailand
,
Vitor M. Correlo3B’s Research Group – Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, University of Minho, Guimarães, Portugal;PT Government Associate Laboratory, ICVS/3B’s, Guimarães, Portugal
,
Isabel B. Leonor3B’s Research Group – Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, University of Minho, Guimarães, Portugal;PT Government Associate Laboratory, ICVS/3B’s, Guimarães, Portugal
,
Pasquale Palladino3B’s Research Group – Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, University of Minho, Guimarães, Portugal;PT Government Associate Laboratory, ICVS/3B’s, Guimarães, PortugalCorrespondence[email protected]
&
Rui L. Reis3B’s Research Group – Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, University of Minho, Guimarães, Portugal;PT Government Associate Laboratory, ICVS/3B’s, Guimarães, PortugalCorrespondence[email protected]
Pages 982-986 | Received 01 Mar 2015, Accepted 18 Jul 2015, Published online: 24 Aug 2015
 
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Abstract

The redox properties of natural extract from cuttlefish ink sac (Sepia officinalis) and synthetic melanin used as a biomimetic in melanin structural investigation were determined by comparison of this phenol-based heterogeneous pigment with gallic acid used as a standard in Folin–Ciocalteu colorimetric assay widely employed for characterisation of oxidative properties of biomaterials. Reactivity of sepia melanin reported here is much higher than previously indicated and this protocol should allow the redox characterisation of all melanins irrespective of their origin and composition.

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Disclosure statement

No potential conflict of interest was reported by the authors.

Funding

This work was supported by the European Union’s Seventh Framework Programme (FP7/2007-2013) [grant agreement number REGPOT-CT2012-316331-POLARIS]; Khon Kaen University grant to PS.

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