| 摘要 |
<p>PURPOSE:To permit packaged foods to be preserved without being spoiled by mixing an effective component having antiseptic and antibacterial properties extracted from a bamboo leaf with the plastic capable of being supplied on a quantitatively and qualitatively stable basis. CONSTITUTION:Either or both of the leaf and stalk of a naturally seasoned bamboo is pulverized by a fluidized grinding machine or ceramic mortar to obtain the bamboo powder in a desired particle size. The bamboo powder is made swollen in a solution of caustic soda, its pH is adjusted with an aqueous solution of hydrochloric acid, cellulose is decomposed by enzyme, filtered residue is dried under vacuum and the dried product is immersed in alcohols such as ethyl alcohol. After removal of the alcohols by evaporation, the residue consists of an antiseptic and antibacterial component A, chlorophyll and the decomposed cellulose. An antiseptic and antibacterial component B, a mixture of antiseptic and antibacterial component and chlorophyll, is obtained from the antiseptic and antibacterial component A. An antiseptic and antibacterial component C consisting mainly of the antiseptic and antibacterial component from the antiseptic and antibacterial component B. The plastics intended to be coated and impregnated with the effective component are polyethylene, polypropylene, etc.</p> |
