O-15　コーヒー粕の有効利用法探索

セルロース誘導体を成形助剤とするコーヒー粕シートの開発

抄録

Spent coffee grounds discharged from beverage makers, coffee shops, convenience stores, homes, etc. are plant-derived biomass resources and must be effectively utilized. Coffee grounds still contain caffeine and chlorogenic acid, palmitic acid and other fatty acids. After extraction of these useful chemicals, we propose the sheet forming of the waste coffee grounds using a cellulose derivative: hydroxypropylmethyl cellulose (HPMC) as a molding aid. It was confirmed by a capillary rheometer that the extrudability of ethanol-extracted coffee grounds was almost the same as that of raw coffee grounds. Using a kneading vacuum extrusion molding machine, ethanol-extracted coffee grounds with citric acid and glycerin was successfully molded to give a flat sheet. The obtained sheet was flexible and could be hot press molded. Further heating was able to suppress water absorption.