Data/hora: 07/06/2024 15:21:07

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 07/08/1995
Data da última atualização: | 20/07/2012
Autoria: | CORADIN, L.; GIANNASI, D. E.
Título: | The effects of chemical preservations on plant collections to be used in chemotaxonomic surveys.
Ano de publicação: | 1980
Fonte/Imprenta: | Taxon, v.29, n.1, p.33-40, Feb. 1980.
Idioma: | Inglês
Conteúdo: | The absence of flavonoids in otherwise perfectly preserved tropical plant specimens suggest that chemical solutions used to preserve these specimens in the field are responsible for the removal (i.e. pre-extraction) of flavonoids during pressing and storage in the field. Accordingly seventeen temperate plant taxa representing two fern and nine angiosperm families were subjected to collecting procedures and preservative solutions typically used in tropical field work. These solutions, especially those containing formaldehyde, effectively "pre-extracted" flavonoids and other phenolics from plants placed in presses ans stored in plastic bags, and the newspaper blotter in which the chemically treated specimen had been stored could also be extracted and upon two dimensional paper chromatography show a partial flavonoid "profile" of spots corresponding to that observed in the "donor" species. Direct extraction of fresh or dried material in flasks with any of the common presrvatives used confirms that all of these solutions are higly effective in extracting flavonoids. It is recommended that chemical preservatives not be employed indiscriminately on plant material to be used later in chemotaxonomic surveys.
Palavras-Chave: | Chemical preservation; Chemotaxonomic; Colecao; Collection; Flavonoid; Planta tropical; Preservacao quimica; Tropical plant.
Thesagro: | Taxonomia.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (29011-1) - ADD - SP - -- - SP0708 -  - 0708 - DIS