| 摘要 |
<p>A small amount of water at the top of the cylinder (pref. 2-15% basing on the amount of lactose) is added to alpha-lactose or the material containing alpha-lactose, and the mixture is injected under pressure from an extruder (pref. screw extruder). The temp. of the mixture at the top of the cylinder is elevated to 100-200 degrees C under k-40 kg/cm2 pressure by the frictional heat and heat of compression, and alpha-lactose is thus converted to beta-lactose. Obtained beta-lactose or beta lactose containing product may be dried and crushed if necessary. If the amount of water to be added is over 15%, injected beta-lactose which is once generated by the conversion from alpha-lactose, becomes muddy and turns back to alpha-lactose again if it is allowed to stand in such state. If the amount of water is 4-7%, the injection may be performed smoothly and injected product containing beta-lactose is the slurry containing only small amount of water, and this water is evaporated at once and the amount of water is reduced to 1-5%. Therefore, the conversion back to alpha-lactose may be hardly caused. The process may be useful for the preparation of the raw material for modified powder milk, baby food, and health diets. The product is, moreover, superior in the crumbling resistance and binding power as well as in the sweetness, therefore, it serves quite well for the improvement of bulking agent for tablets of medicines.</p> |
