Alkaline pretreatment using ammonium hydroxide, NH_4OH serves as one of a process to remove lignin from lignocellulosic biomass such as oil palm trunk fiber. In this study, the effect of NH_4OH pretreatment on removal of oil palm trunk lignin was investigated. The oil palm trunk fiber was dissolved in NH_4OH with different concentrations (6, 8 and 10 %), different duration (3, 5 and 7 h) and temperatures (60, 80 and 100 °C). The samples were analyzed by using UV-Vis to estimate the concentration of extracted lignin. The result indicates that the optimum conditions to gain maximum extracted lignin were 8% NH_4OH, 100 °C and 5 h with concentration of 64 mgL~(-1) while the lowest was at 6% NH_4OH, 100 °C and 5 h with concentration of 62.5 mgL~(-1).
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