Data/hora: 04/06/2024 03:43:49

Biblioteca(s): | Embrapa Mandioca e Fruticultura.
Data corrente: | 20/04/2004
Data da última atualização: | 20/04/2004
Autoria: | BUSCHMANN, H.; RODRIGUEZ, M. X.; IGLESIAS, C.; BEECHING, J. R.
Título: | Qualitative and quantitative changes of phenolic components of cassava (Manihot esculenta CRANTZ) roots during post-haverst physiological deterioration.
Ano de publicação: | 1998
Fonte/Imprenta: | Revista Brasileira de Mandioca, Salvador, v.17, p.85, nov, 1998. Suplemento.
Idioma: | Inglês
Conteúdo: | Abstract: While cassava (Manihot esculenta Crantz) is one of the more important crop plants in Afiica, Asia and Latin America, it does suffer from major endogenous problems. These include a high content of cyanogenic glycosides, and rapid post-harvest biochemical changes, known as postharvet physiological deterioration (PPD), which render unpalatable. PPD is accompanied by the acculation of products of the isoprenoid and phenylpropanoid pathways. to date terpenoids accumulated during PPD have been well characterised, yet equivalent data on the phenolic componets are lacking. We are identifying these phenolic compounds and examined their qualitative changes during PPD. In addition we are comparing these changes in different cassava cultivars which show differential PPD responces. By using analytical methods (HPLC and TCL) and spectroscopic methods (UV, MS and NMR) most of the donu'nant compounds can be identified from ethanolic root extracts. These compounds are compared to the metabolites normally present in the root. Different coumarins, flavoinod glycosides can be identified as  typical "stress metabolites" synthesised after harvest of the root. These componets accumulate and their quality fluctuates during different stages of PPD. The succession of compounds varies in different cultivars of cassava. This detailed knowledge of the synthesis and succession of different components in cassava roots during PPD can broaden our understanding of its biochemistry, thereby assisting in approaches towards the modification of PPD.
Categoria do assunto: | --
Registro original: | Embrapa Mandioca e Fruticultura (CNPMF)
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