PROBLEM TO BE SOLVED: To provide compositions of proteins having free thiols, and methods of making and using the compositions.SOLUTION: A composition includes a protein having a free thiol, and a carbohydrate. The carbohydrate is present in an amount sufficient to maintain the stability of the protein. The pH of the composition is less than 7.0.EFFECT: Such a composition (e.g., a liquid composition containing a protein) has a prolonged stable period. The stability includes parameters such as a protein structure and/or a biological activity of the protein.SELECTED DRAWING: None【課題】遊離チオールを有するタンパク質の組成物並びに前記組成物の作製方法及び使用方法の提供。【解決手段】遊離チオールを有するタンパク質および炭水化物を含む組成物であって、該炭水化物が、該タンパク質の安定性の維持に十分な量で存在し、該組成物のpHが7.0未満である、組成物。【効果】前記組成物(例えば、タンパク質を含む液体組成物)は、安定な期間が長い。安定性は、タンパク質構造及び/又はタンパク質の生物学的活性等のパラメーターを含む。【選択図】なし