PROBLEM TO BE SOLVED: To provide an acid-releasing body capable of retaining the acid-releasing ability and exhibiting the acid-releasing ability as needed even if it has no complicated structure. An acid-emitter containing a protein composition containing an esterified protein and an acid or a base. [Selection diagram] None【課題】複雑な構造を備えなくても酸放出能が保持され、必要に応じて酸放出能を発揮することができる、酸放出体を提供すること。【解決手段】エステル化されたタンパク質を含むタンパク質組成物と、酸又は塩基と、を含有する、酸放出体。【選択図】なし
