Anales del Jardín Botánico de Madrid, Vol 65, No 1 (2008)

Secondary metabolites of lichens in the snow zone of the Sierra Nevada in Mérida-Venezuela and their role in the absorption of ultraviolet radiation


https://doi.org/10.3989/ajbm.2008.v65.i1.246

José Alberto Rojas-Fernández
Centro de Microscopía Electrónica “Dr. Ernesto Palacios Prü”, Universidad de Los Andes, Venezuela, Bolivarian Republic of

Alirio Balza-Quintero
Centro de Microscopía Electrónica “Dr. Ernesto Palacios Prü”, Universidad de Los Andes, Venezuela, Bolivarian Republic of

Vicente Marcano
Centro de Microscopía Electrónica “Dr. Ernesto Palacios Prü”, Universidad de Los Andes, Venezuela, Bolivarian Republic of

Paula Andrea Rojas
Centro de Microscopía Electrónica “Dr. Ernesto Palacios Prü”, Universidad de Los Andes, Venezuela, Bolivarian Republic of

Delsy Dávila-Vera
Centro de Microscopía Electrónica “Dr. Ernesto Palacios Prü”, Universidad de Los Andes, Venezuela, Bolivarian Republic of

Zulma Peña-Contreras
Centro de Microscopía Electrónica “Dr. Ernesto Palacios Prü”, Universidad de Los Andes, Venezuela, Bolivarian Republic of

Rosa Virginia Mendoza-Briceño
Centro de Microscopía Electrónica “Dr. Ernesto Palacios Prü”, Universidad de Los Andes, Venezuela, Bolivarian Republic of

Ernesto Palacios-Prü
Centro de Microscopía Electrónica “Dr. Ernesto Palacios Prü”, Universidad de Los Andes, Venezuela, Bolivarian Republic of

Abstract


Photochemical analyses of secondary compounds in lichens from the venezuelan andean snow zone were carried out in order to know the absorbance capacity of UV radiation at the UVA, UVB and UVC ranges and to determine its probable UV protective function. Spectrophotometric (UV) and fine layer chromatographic techniques (TLC) were utilized to separate and identify the compounds. UV radiation values were obtained from the Red Bioclimática del Parque Nacional Sierra Nevada de Mérida which constitutes a program supported by the University of Los Andes, Venezuela. Results indicated the existence of 22 species of lichens at the snow zone; 55% of these species showed a strong resistance to UVC radiation, 95% to UVB radiation, whereas the 100% revealed a strong resistance to UVA radiation. The substances that have the highest resistance to UVA and UVB radiation are characterized by having ester bonds among phenolic units depsids and constitute the most abundant products in lichens, whereas the substances having both ester and ether bonds among the two phenolic units depsidones revealed a higher capacity to absorb UVC radiation that could indicate a primitive origin.

Keywords


lichen substances; UV radiation; UV filter; Venezuelan Andes

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