Comparative Mössbauer and infrared analysis of iron-containing melanins

Bardani, L.; Bridelli, Maria Grazia; Carbucicchio, M.; Crippa, P.R.

doi:10.1016/0304-4165(82)90196-9

Cited by 31 publications

(19 citation statements)

References 7 publications

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“…5) and fit well with established vibrations in the literature (27)(28)(29)(30). A broad band corresponding to phenolic OH stretches is seen at 3400 cm Ϫ1 , aromatic CϭC stretches and COO stretches are visible at 1600 -1650 cm…”

Section: Resultssupporting

confidence: 87%

Melanin and Glycera Jaws

Moses

Harreld

Stucky

et al. 2006

Journal of Biological Chemistry

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Section: Resultssupporting

confidence: 87%

Melanin and Glycera Jaws

Moses

Harreld

Stucky

et al. 2006

Journal of Biological Chemistry

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“…The spectrum obtained by us at 90 K is shown in Fig. 4 and is similar to the spectrum of melanin described in the literature (35). We measured the spectrum of NM also at 4.1 K, and obtained a spectrum very similar to that shown in Fig.…”

Section: Identification Of Iron-binding Compoundsmentioning

confidence: 77%

Iron in parkinsonian and control substantia nigra—A mössbauer spectroscopy study

et al. 1996

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We used Mössbauer spectroscopy to study the iron content, the redox state, and the binding site of iron in substantia nigra (SN) from parkinsonian (PD) and control brains. Measurements performed on fresh-frozen, formalin-fixed, and lyophilized samples demonstrated the presence of ferric (Fe3+) iron only, both in PD and control SN. Ferrous iron, if present at all, may represent at most 5% of the total iron. We found no difference in the total amount of iron in SN between PD and control brains. The Mössbauer spectra observed at 4.1 K in fresh (frozen or lyophilized) samples were different from those obtained in formalin-fixed (frozen or lyophilized) samples. In the fresh samples, only ferritin-like iron was observed, whereas in the samples frozen or lyophilized from formalin, non-ferritin iron was detected.

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“…The FTIR spectrum of S. officinalis melanin consists of three major bands centered at 3;400 cm −1 , 1;605 cm −1 , and 1;371 cm −1 (28)(29)(30). The band at 3;400 cm −1 is dominated by absorption due to the stretching mode of the OH bond, while the band at 1;605 cm −1 is attributed to the carbonyl stretch in indole quinone.…”

Section: Resultsmentioning

confidence: 99%

Direct chemical evidence for eumelanin pigment from the Jurassic period

Glass

Ito

Wilby

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

172

168

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Melanin is a ubiquitous biological pigment found in bacteria, fungi, plants, and animals. It has a diverse range of ecological and biochemical functions, including display, evasion, photoprotection, detoxification, and metal scavenging. To date, evidence of melanin in fossil organisms has relied entirely on indirect morphological and chemical analyses. Here, we apply direct chemical techniques to categorically demonstrate the preservation of eumelanin in two >160 Ma Jurassic cephalopod ink sacs and to confirm its chemical similarity to the ink of the modern cephalopod, Sepia officinalis. Identification and characterization of degradation-resistant melanin may provide insights into its diverse roles in ancient organisms.

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Comparative Mössbauer and infrared analysis of iron-containing melanins

Cited by 31 publications

References 7 publications

Melanin and Glycera Jaws

Melanin and Glycera Jaws

Iron in parkinsonian and control substantia nigra—A mössbauer spectroscopy study

Direct chemical evidence for eumelanin pigment from the Jurassic period

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