PROBLEM TO BE SOLVED: To provide an extract, a purified product, food/drink or medicine which has an antitumor action and/or a liver function improvement action which include an immunostimulating action against cancer cells and its resultant cancer cell proliferation inhibitory action, and a method for manufacturing the same.SOLUTION: There is provided a manufacturing method of a liver function improving agent including: acquiring an extract of loquat tea by making the loquat tea be subjected to hot water extraction and obtaining concentrate or dry powder of the loquat tea extract by making the extract be subjected to reduced-pressure drying and freeze-drying. There is provided a liver function improving agent or a fractionated matter for food/drink for improving liver function which is obtained by this method. There is also provided a manufacturing method of a cancer cell proliferation inhibitor or an immunostimulating agent against cancer cells which includes fractionating the concentrate or the dry powder of loquat tea extract by column chromatography using resin that adsorbs hydrophobic substance, and a cancer cell proliferation inhibitor, an immunostimulating agent against cancer cells, or a fractionated matter for food/drink for immunostimulation against cancer cells which is obtained by this method.COPYRIGHT: (C)2014,JPO&INPIT【課題】癌細胞に対する免疫賦活化作用、及びその結果としての癌細胞増殖抑制作用を含む抗腫瘍作用並びに/又は肝機能改善作用を有する抽出物、精製物、飲食品又は医薬及びその製造方法の提供。【解決手段】ビワ茶を熱水抽出に供して抽出物を取得し、該抽出物を減圧乾燥、及び凍結乾燥に供することによりビワ茶抽出物の濃縮物又は乾燥粉末を得ることを含む肝機能改善剤の製造方法、並びにこの方法により得られる肝機能改善剤又は肝機能改善のための飲食品用分画物、ビワ茶抽出物の濃縮物又は乾燥粉末を疎水性物質を吸着する樹脂を用いたカラムクロマトグラフィーにより分画することを含む癌細胞増殖抑制剤又は癌細胞に対する免疫賦活化剤の製造方法、および、この方法により得られる癌細胞増殖抑制剤又は癌細胞に対する免疫賦活化剤或いは癌細胞に対する免疫賦活化のための飲食品用分画物の提供。【選択図】図8
