| abstract |
The invention relates to a process for the preparation of a sugar product from lignocellulosic material, comprising the following steps: a) optionally, pretreatment of the lignocellulosic material; b) optionally, washing of the optionally pretreated lignocellulosic material; c) enzymatic hydrolysis of the lignocellulosic material optionally washed and / or optionally pretreated using an enzyme composition comprising at least two cellulases and whereby the enzyme composition comprises at least GH61; and d) optionally, recovery of a sugar product; in which during part of the enzymatic hydrolysis time, oxygen is added to the lignocellulosic material and during part of the enzymatic hydrolysis time less oxygen is added to the lignocellulosic material compared to the other part of the enzymatic hydrolysis time, preferably it is not added oxygen to the lignocellulosic material. |