RESUMO A palma forrageira é uma cultura altamente resistente, e oferece benefícios em sua mucilagem para a indústria devido às suas propriedades físico-químicas. Objetivou-se analisar o efeito do manejos de irrigação, época de colheita, tamanho do cladódio e adição de ácido cítrico durante o processamento no rendimento agroindustrial e nas propriedades físico-químicas de mucilagem extraída de cladódios de Nopalea cochenillifera clone Miúda cultivados em sequeiro e irrigados. Foram medidos o rendimento, teor de sólidos solúveis, acidez titulável, pH, teor de K+ e Na+, e condutividade elétrica na mucilagem. As práticas de manejo no campo resultaram em alterações nos ftoquímicos estudados. No cultivo de sequeiro, a colheita noturna dos cladódios maiores aumentou os teores de K+ e sólidos solúveis. A adição de ácido cítrico à extração da mucilagem resultou em maiores quantidades de sólidos solúveis, acidez titulável e condutividade elétrica e menores valores de pH. A maior disponibilidade hídrica promoveu maiores rendimentos de mucilagem.

ABSTRACT Cactus is a highly resistant crop, and offers benefits in its mucilage for the industry due to its physicochemical properties. This study aimed to analyze the effect of irrigation managements, harvest time, cladode size and citric acid addition during the processing on the agro-industrial yield and physicochemical properties of mucilage extracted from cladodes of Nopalea cochenillifera Miúda clone cultivated under rainfied and irrigated conditions. The yield, soluble solids content, titratable acidity, pH, K+ and Na+ contents, and the electrical conductivity were measured in the mucilage. The management practices in the field resulted in changes in the studied phytochemicals. For the rainfied cultivation, the night harvest of the biggest cladodes increased the K+ and soluble solids contents. The addition of citric acid to the mucilage extraction resulted in higher amounts of soluble solids, titratable acidity and electrical conductivity and lower pH values. The highest water availability promoted higher mucilage yields.

The aim of this study was to evaluate the performance of enzymatic hydrolysis of acid or alkali pretreated sugarcane bagasse for the production of fermentable sugars. The first step consisted of selection of commercial enzymes presenting the highest cellulolytic activities. After selection of four enzymes: HPL, CL, P1 and P4, their performances were tested in the bagasse pretreated with acid and alkali. The sugar content of the hydrolysates was analyzed by anion exchange liquid chromatography. Data showed that the joint action of 0.5% acid pretreatment, 121ºC, 30 minutes and enzyme CL provides the best results, 67.25 g of hexose and 148.13g of pentose per kg of dry bagasse.