Data/hora: 15/06/2024 15:50:47

Biblioteca(s): 	Embrapa Pecuária Sudeste.	
Data corrente: 	25/11/1999	
Data da última atualização: 	05/01/2022	
Autoria: 	FERREIRA, E. C.; NOGUEIRA, A. R. de A.	
Afiliação: 	EDILENE C. FERREIRA, UFSCAR; ANA RITA DE ARAUJO NOGUEIRA, CPPSE.	
Título: 	Vanillin-condensed tannin study using flow injection spectrophotometry.	
Ano de publicação: 	2000	
Fonte/Imprenta: 	Talanta, v.51, p.1-6, 2000.	
Idioma: 	Inglês	
Conteúdo: 	Studies involving the kinetic reaction between vanillin and condensed tannins were developed using a flow injection system with spectrophotometric determination. A solution of the monomeric compound (-)-epicatechin was used as the analytical standard. This compound was chosen due to its structure, which is similar to a polymeric unit of the condensed tannin present in plants. The results indicated that the vanillin - condensed tannin reaction is time dependent and affected by the degree of polymerization of the condensed tannin. The flow system allowed ( - )-epicatechin to be used without overestimating the content of the tannin present in the forage legume, guandu (Cajanus cajan (L.) Millsp.), studied. A relative standard deviation (R.S.D.) of < 1% was found for a 4 h period work and allowed the determination of about 60 samples h ' with a detection limit of 1.05 mg I ' for condensed tannin. When compared to the manual vanillin procedure, the proposed approach can be used with various advantages.	
Palavras-Chave: 	Flow injection; Guandu seeds; Spectrophotometry; Tannin.	
Categoria do assunto: 	W Química e Física	
Registro original: 	Embrapa Pecuária Sudeste (CPPSE)	
Exemplares: 	CPPSE - (12537-1) - UPC - AP - DD - PROCI-2000.00004 - FER - 2000.00004 - DIS