Abstract
Recently, most countries have banned the use of the meat and bone meal for the feed of cattle. For example, in Japan, the meat and bone meal has been disposed with the burnout of more than 800 degrees. However, it is said that the large quantity of meat and bone meal has just been preserved in freeze. The immediate processing of meat and bone meal, therefore, is eagerly hoped. In this study, the production of useful substances from the meat and bone meal by subcritical water hydrolysis were performed. The meat and bone meal was hydrolyzed under the reaction temperature range of 473-563 K and the reaction time of 1-20 minutes. After reaction, oil was extracted. The yield of oil was maximum to 0.13 kg/kg-dry sample. These components were oleic acid, palmitic acid, stearic acid and so on. In the aqueous phase, many useful substances were produced, that included organic acids, amino acids and so on. At 563 K, pyroglutamic acid showed the maximum yield of organic acids, 0.05 kg/kg-dry sample. The yields of glycine and alanine at 533 K by a 15 min reaction were 0.019 kg/kg-dry sample and 0.013 kg/kg-dry sample, respectively. Bone remained to be solid, but to be powdery.
