Resumo

JAIMES CRUZ, Ligia Johana et al. Enzymatic hydrolysis of maralfalfa grass (Pennisetum sp) submmited to wet extrusión. Rev. ion [online]. 2021, vol.34, n.1, pp.111-120.  Epub 01-Jan-2021. ISSN 0120-100X.  https://doi.org/10.18273/revion.v34n1-2021009.

The effect of extrusion of maralfalfa grass (Pennisetum sp) on the chemical composition of the cell wall and the in vitro digestibility of dry matter and fiber in neutral detergent was evaluated. Seven samples (10.0 kg/sample) were collected from the same batch, with 51 days of regrowth, and chopped 2 cm. Three of them, taken at random, were processed fresh in a conical screw extruder turning at 1050 rpm and with 3 mm output, while the other four were extruded in the same equipment with 1 mm output. In the samples of raw grass and bagasse from the extrusion, the fibre content in neutral detergent, fibre in acid detergent, lignin in acid detergent, in vitro digestibility of dry matter and in vitro digestibility fibre in neutral detergent were determined. The Student T test was applied to analyze the effect of the type of treatment, both among them and with respect to fresh grass. The results indicate that, with respect to fresh grass, the extrusion generated a bagasse with high fiber content in neutral detergent, increased the in vitro digestibility of dry matter by 8.81 % and that of fiber in neutral detergent by 20.6 %, but did not differ due to the size of the extruder outlet (p<0.1). It is concluded that the extrusion process as applied to maralfalfa grass in this experiment improves the digestibility of dry matter and fiber in neutral detergent.

Palavras-chave : Bagasse; Biomass; Delignification; Fiber; In vitro.

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