Determinação do teor de lignina em amostras vegetais através de três métodos analíticos e correlação com digestibilidade in vitro / Determination of lignin concentration in vegetable samples through three analytical procedures and correlation with in vitro digestibility

AUTOR(ES)

Adriana Paula Fuzeto

DATA DE PUBLICAÇÃO

2003

RESUMO

The in vitro digestibility either dry matter or cell wall of different vegetable samples arranged in three groups: forages, wood or bamboos was correlated with lignin concentration determined through three analytical methods. The employed methods were: acid detergent lignin (ADL), Klason lignin (KL) and potassium permanganate lignin (PerL). Lignin concentrations were different among the methods for the same samples, generally larger for KL and PerL. For almost all samples, lignin concentration was negatively correlated with in vitro digestibility of dry matter and cell wall. ADL method predicted digestibility of grasses and bamboos reasonably well, followed by PerL. KL content was not a good predictor of grass digestibility. Concerning woods, none of the three methods was a good predictor of digestibilty, even the KL method, traditionally used for wood. It is concluded that none of the three methods was totally satisfactory, suggesting that analytical determination of lignin needs more research effort.

ASSUNTO(S)

bamboo lignina klason lignina em detergente ácido madeira potassium permanganate lignin lignina permanganato de potássio forragem klason lignin bambu grasses acid detergent lignin wood

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