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Strepsilin
Strepsilin is a chemical found in Lichen, lichens. It produces an emerald green colour in the C test. It is a dibenzofuran dimer, with hydroxyl, hydroxy, ketone, oxy and methyl side groups. It is named after ''Cladonia strepsilis''. Strepsilin was discovered by Friedrich Wilhelm Zopf, Wilhelm Zopf in 1903. The structure of strepsilin was determined by Shoji Shibata. Properties Strepsilin is degraded in alkali to 1-methyl-3,7-dihydroxydibenzofuran. Strepsilin melts at 324 °C. Occurrence Strepsilin is found in some ''Cladonia'' species. It is also found in ''Siphula'' and ''Stereocaulon azoreum''. References {{Reflist Dibenzofurans Furanones Isobenzofurans Phenols Lichen products Heterocyclic compounds with 4 rings ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
C Test
A spot test in lichenology is a spot analysis used to help identify lichens. It is performed by placing a drop of a chemical on different parts of the lichen and noting the colour change (or lack thereof) associated with application of the chemical. The tests are routinely encountered in dichotomous keys for lichen species, and they take advantage of the wide array of lichen products produced by lichens and their uniqueness among taxa. As such, spot tests reveal the presence or absence of chemicals in various parts of a lichen. They were first proposed by the botanist William Nylander (botanist), William Nylander in 1866. Three common spot tests use either 10% aqueous potassium hydroxide, KOH solution (K test), saturated aqueous solution of bleaching powder or calcium hypochlorite (C test), or 5% alcoholic p-phenylenediamine, ''p''-phenylenediamine solution (P test). The colour changes occur due to presence of particular secondary metabolites in the lichen. There are several other l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
