Based on the method mentioned above, the untreated peel was found to contain cellulose 21.98%,
hemicelluloses 74.96%, lignin 2.68% and ash 0.38% (on a dry weight basis). After pretreatment, the
composition of pineapple peel showed a significant increase of cellulose and a marked decrease in
hemicelluloses and lignin content (Table 1).