Composição química, ácidos fenólicos e cinética de degradação de cana-de-açúcar

Abstract

The objective of this research was to determine and measure the phenolic acids of sugar cane in natura and ensiled, and its efficiency in both forms of extraction, as well to assess the influence of those acids on the digestibility of various nutrients in the plant, submitted to edaphoclimatic conditions of northern Minas Gerais. We determined the levels of phenolic acids in four sugarcane cultivars (RB855536, RB765418, SP 80-1842 and SP 80-1816) in natura and as silage by high performance liquid chromatography (HPLC). We evaluated the efficiency of extractors, the neutral detergent solution and ethanol 80%, besides determining the relationship between the content of acids with in situ degradability and chemical composition in ensiled and in natura sugarcane. The digestibilities of DM and NDF were not correlated with the concentration of pcoumaric and ferulic phenolic acids. The methodology used in this study was efficient for the detection and quantification of phenolic acids, in varieties and forms, and the two tested extractors showed efficiency in the extraction of pcoumaric and ferulic acid from cell wall of sugar cane.