PROBLEM TO BE SOLVED: To provide a method for producing an anti-influenza virus composition that can be ingested on a daily basis without using ultracentrifugation and is excellent in safety.SOLUTION: According to the present invention, a supernatant liquid is obtained by grating an edible portion of Chinese yam and sonicating it under appropriate conditions to lower the viscosity thereof. The resulting supernatant liquid is provided as an ingestible anti-influenza virus composition. An anti-influenza virus composition comprises storage protein DB2, which is obtained by grating the rhizomes or rhizophores of a Dioscorea plant. A method for producing anti-influenza virus composition comprising sonicating the granted product obtained by granting the rhizomes or rhizophores of a Dioscorea plant to lower the viscosity of the product to 0.005 Pas or less. According to the present invention, alternatively, there is provided anti-influenza virus composition or a method for producing anti-influenza virus composition in which a product of granting the rhizomes or rhizophores of a Dioscorea plant are subjected to dry treatment to make the product powderly.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】超遠心分離を用いずに、日常的に経口摂取でき、安全性に優れた抗インフルエンザウイルス組成物の製造方法の提供。【解決手段】ナガイモの可食部を擂り下ろし、適宜条件にて超音波処理することにより、粘度を低下させることにより得られる上清液、経口摂取可能な抗インフルエンザウイルス組成物とする。ヤマノイモ属植物の地下茎または担根体を擂り下ろした、貯蔵タンパク質DB2を含む抗インフルエンザウイルス組成物。前記ヤマノイモ属植物の地下茎または担根体を擂り下ろしたものの粘度を低下させるため、これを超音波処理して、その粘度を0.005Pa・s以下とする抗インフルエンザウイルス組成物の製造方法。或いは、前記ヤマノイモ属植物の地下茎又は担根体を擂り下ろしたものを乾燥処理して得られる粉末化した、抗インフルエンザウイルス組成物及び、その製造方法。【選択図】図1
