Optimizing ammonia pressurization/depressurization processing conditions to enhance enzymatic susceptibility of dwarf elephant grass

An ammonia pressurization/depressurization process was investigated to eval uate the potential of producing reducing sugars from dwarf elephant grass, a warm-season forage. Moisture, temperature, and ammonia loading affected s ugar yield (p < 0.0001). At optimal conditions, ammonia processing solubili zed 50.9% of the hemicellulose and raised the sugar yield (percentage of th eoretical) from 18 to 83%. Glucose and xylose production were increased 3.2 - and 8.2-fold, respectively. The mild processing conditions of the ammonia treatment (90-100 degrees C, 5 min), the low enzyme loading (2 internation al filter payer units/g), and the short hydrolysis time (24 h), greatly enh ance the potential of using forages to produce sugars valuable for several applications.