ポリビニールポリピロリドン処理した紅茶浸出液に生じる沈殿物について

概要

論文の詳細を見る
Research was done on tea infusions after removing coloring ingredients, such as teaflavines, by Polyvinylpolypyrrolidone (PVPP). Turbidity formation of PVPP treated infusions was formed though it was low in comparison with untreated PVPP infusions, but the precipitate of the small globular form wasn't recognized. Octahedron forms with sharp corners were recognized when tea infusions were treated with PVPP as well as when they weren't. When the concentration of calcium was increased, an octahedron could lose its corners. It was reported that two types of the precipitation of the small globular form and of calcium oxalates are mixed in the tea infusions which are infused with the water containing a little calcium.
山陽学園大学の論文