[Object] An object of the present invention is to newly develop a system for imparting thermostability in a retrogradation preventing agent for food (particularly a retrogradation preventing agent for food containing β-amylase as an active ingredient).[Means for Resolution] The above object was achieved by developing a thermostability imparting material which is in a retrogradation preventing agent for food containing β-amylase as an active ingredient, characterized in that it comprises at least one member selected from a processed yeast material, yam powder and a modified cellulose and imparts thermostability at 90℃ or higher.本發明係以於食品用抗老化劑(特別係含有β-澱粉酶為有效成分之食品用抗老化劑)中新開發之賦予耐熱性系統作為課題者。本發明係藉由開發一種賦予耐熱性素材,其係於以β-澱粉酶為有效成分之食品用抗老化劑中之賦予耐熱性素材,其特徵係選自酵母處理物、山芋粉末、修飾纖維素中之至少一種,且賦予90℃以上之耐熱性,而解決上述課題。
