Infra-Red Spectra of Some Melanins

Bonner, T. G.; Duncan, A.

doi:10.1038/1941078a0

Cited by 55 publications

(20 citation statements)

References 2 publications

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“…The slope obtained by plotting the logarithm of absorbancy versus wavelength, which is used to characterize melanins, is -0.0037 for the R. solani material, a value comparable to the extracellular melanin of Aureobasidium pullulans (8), but different from that of Mucor rouxii spore walls (3), and the infrared spectra for the R. solani and Cladosporium sp. melanins are comparable to those obtained for other melanins (4,5). The elemental analysis of these two preparations suggests similarities with the melanins of animal and plant tissues (11).…”

Section: Discussionsupporting

confidence: 80%

Susceptibility and Resistance of Several Fungi to Microbial Lysis

1966

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Streptomyces, Nocardia, and Pseudomonas capable of lysing hyphae of Fusarium solani or Neurospora crassa were obtained by selective culture, but attempts to isolate an organism lysing Rhizoctonia solani failed. When provided with F. solani or N. crassa as carbon sources, the actinomycetes tested produced f3-(1-* 3) glucanase and chitinase. A mixture containing purified chitinase and (3-(1-, 3) glucanase induced spheroplast formation in F. solani, caused some morphological changes in N. crassa, but had almost no effect on R. solani hyphae. The polysaccharides in R. solani walls, which contain a large amount of glucose as well as galactose, mannose, and glucosamine, were not hydrolyzed appreciably by the two enzymes. Laminaribiose and laminaritriose were released by enzymatic hydrolysis of F. solani and N. crassa walls, and gentiobiose was liberated from R. solani and N. crassa walls. Melaninlike materials were found in R. solani walls, accounting for

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Section: Discussionsupporting

confidence: 80%

Susceptibility and Resistance of Several Fungi to Microbial Lysis

1966

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“…The infrared spectra of all the pigments exhibited broad, poorly resolved peaks with bands representative of hydroxyl, conjugated carbonyl, and aromatic groups. The spectra of the two brown pigments from DTP-and ME2SO-inhibited cultures were identical and similar to the infrared spectra of some natural melanins (4).…”

Section: Resultssupporting

confidence: 59%

Studies on the biosynthesis of aspergillin by Aspergillus niger.

Ray¹,

Eakin²

1975

Applied Microbiology

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Two inhibitors of the biosynthesis of aspergillin, the black spore pigment of Aspergillus niger, have been investigated. 2,4-Dithiopyrimidine exerted its inhibitory effect by intracellularly chelating cupric ion required for normal pigmentation. Dimethylsulfoxide prevented the synthesis of certain phenolic precursors of the native pigment. Partial purification and characterization of pigments from mature cultures revealed the presence of at least three components: (i) a high-molecular-weight (-20,000) native pigment fraction in untreated mold cultures, (ii) a lower-molecular-weight (-5,000) melanin pigment found in both types of inhibited cultures, and (iii) a low-molecular-weight (368) green pigment found only in the 2,4-dithiopyrimidine-inhibited cultures and proposed to be a pentacyclic quinonoid derivative. A pathway for aspergillin biosynthesis is suggested based on these results.

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“…Suryanarayanan et al (2004) have described the IR spectrum of melanin with peaks near 3,352.5 cm -1 ascribed to -OH and -NH bonds (Bonner and Duncan 1962). The Infrared spectrum of the present study exhibited a broad absorption band at 3,445.05 cm -1 which revealed the presence of hydroxyl group.…”

Section: Treatment With Melanin Synthesis Inhibitorsmentioning

confidence: 86%

Isolation and characterization of melanin pigment from Pleurotus cystidiosus (telomorph of Antromycopsis macrocarpa)

Selvakumar

Rajasekar

Periasamy

et al. 2008

World J Microbiol Biotechnol

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Melanins are enigmatic pigments that are produced by a wide variety of microorganisms including several species of bacteria and fungi. For more than 40 years, fungi have been known to produce pigments called melanins. Melanin pigment production by mushrooms was not intensively studied. The present study was carried out on isolation and characterization of melanin from an edible mushroom Pleurotus cystidiosus var. formosensis. The mushroom produced dark mucous mass of hyaline arthrospores on mycelium. The coremia exclusively produced dikaryotic arthrospores with the remnant of a clamp connection. Continuous cell extension and division in the coremium stipe supplied cells for arthroconidiation at the coremium apex, which is surrounded by a liquid droplet (coremioliquid). The black coloured coremea (conidia) were produced by Antromycopsis macrocarpa (anamorph of P. cystidiosus) when cultured on potato dextrose agar medium. The agar plate was incubated at continuous light illumination for high amount of pigment (coremea) production. The slimy layer of the coremea was extracted and partially purified by alkaline and acid treatment. The black pigment was confirmed as melanin based on UV, IR and EPR spectra apart from chemical analysis. This is the first report on characterization of melanin obtained from Pleurotus cystidiosus var. formosensis.

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Infra-Red Spectra of Some Melanins

Cited by 55 publications

References 2 publications

Susceptibility and Resistance of Several Fungi to Microbial Lysis

Susceptibility and Resistance of Several Fungi to Microbial Lysis

Studies on the biosynthesis of aspergillin by Aspergillus niger.

Isolation and characterization of melanin pigment from Pleurotus cystidiosus (telomorph of Antromycopsis macrocarpa)

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