Identification of Lichen Substances

Huneck, Siegfried; Yoshimura, Isao

doi:10.1007/978-3-642-85243-5_2

Cited by 387 publications

(485 citation statements)

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“…FT-IR and EI mass spectra were also obtained. Spectral data were in accordance with the literature (2,4,6).…”

supporting

confidence: 74%

Antibacterial activity of orsellinates

Gomes¹,

Júnior²,

Seidel³

et al. 2003

Braz. J. Microbiol.

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In order to obtain new compounds with antibacterial activity, the derivatives 2,4-dihydroxy-6-methylbenzoic acid (orsellinic acid) and 2,4-dihydroxy-6-methylbenzoates (orsellinates) were obtained through alcoholyses of lecanoric acid. All these substances were tested against Gram-positive and Gram-negative bacteria by a microdilution method. Staphylococcus aureus, Xanthomonas campestris var. vesicatoria and Ralstonia solanacearum were most sensitive to n-propyl 2,4-dihydroxy-6-methylbenzoate, n-pentyl 2,4-dihydroxy-6-methylbenzoate and n-hexyl 2,4-dihydroxy-6-methylbenzoate with MIC (Minimal Inhibitory Concentration) values ranging from 62.5 to 7.8 µg⋅mL -1 . These results showed that homologation in carbon chain may lead to compounds with more pronunced activities.

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“…FT-IR and EI mass spectra were also obtained. Spectral data were in accordance with the literature (2,4,6).…”

supporting

confidence: 74%

Antibacterial activity of orsellinates

Gomes¹,

Júnior²,

Seidel³

et al. 2003

Braz. J. Microbiol.

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“…[3,7] This generated mainly qualitative data, which are reported in Huneck and Yoshimura's compilation. [25] As in the case of true oakmoss, [1] whatever the extraction solvent or process, either batch or continuous, [24] the duration and intensity of the hydrolytic pre-treatment can indeed generate a variety of extracts with different compositional characteristics. [3,23] This variability is drastically increased depending on the origin of the lichen (see Introduction) and the host conifer tree, viz.…”

Section: Qualitative Composition Of Treemoss Extractsmentioning

confidence: 99%

Lichen extracts as raw materials in perfumery. Part 2: treemoss

Joulain¹,

Tabacchi

2009

Flavour & Fragrance J

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This is a comprehensive review of extracts from the lichen Pseudevernia furfuracea (treemoss) that are used in the fragrance industry. Qualitative and quantitative analytical aspects are critically reviewed and the results are compared to those of the related oakmoss extracts. It is shown that more than 90 constituents have been identified so far in treemoss extracts, including 42 depsides, depsidones or depside-derived compounds, and 42 triterpenes or steroids. Constituents of certain host trees, mainly Pinus species, generate specific analytical and toxicological issues which need to be considered in addition to those related to the known degradation products of lichen compounds. A new classification of lichen extracts used as raw materials in fragrance compounding is proposed

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“…In addition, anthraquinones were tested on the TLC plates with KOH (purple colouration). Parietin (=Physcion ROTH 7412) and Emodin (FLUKA 47170) served as reference substances for Rf values (Huneck & Yoshimura 1996 Thallus small, 1-4 cm across, adpressed, yellow; lobes irregularly branched, up to 2 mm long and c. 1·5 mm wide, flat or usually slightly convex (Fig. 1C); in section 100-150 m thick (Fig.…”

Section: Thin Layer Chromatography (Tlc)mentioning

confidence: 99%

Three new Xanthoria species from South Africa: X. hirsuta, X. inflata and X. doidgeae

Eichenberger

Aptroot²,

Honegger

2007

The Lichenologist

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Abstract:Three new Xanthoria species are described from South Africa. Xanthoria hirsuta sp. nov. has hairs on the surface of the thallus and apothecia, best visible in young, growing parts. Dust particles and sand granules stick to this hairy surface, giving the thallus a somewhat dirty appearance. Xanthoria inflata sp. nov. has inflated lobes similar to a Menegazzia. It carries numerous crystals on its medullary hyphae, which are ivory-coloured in young, but intensely orange coloured in old lobes. Xanthoria doidgeae sp. nov. has relatively small lobes with pruinose margins. All three species are fertile, none of them forms symbiotic propagules.

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Identification of Lichen Substances

Cited by 387 publications

References 0 publications

Antibacterial activity of orsellinates

Antibacterial activity of orsellinates

Lichen extracts as raw materials in perfumery. Part 2: treemoss

Three new Xanthoria species from South Africa: X. hirsuta, X. inflata and X. doidgeae

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