To provide a method for increasing the water-soluble dietary fiber content of a sugar heat condensate containing a monosaccharide and levoglucosan, and optionally a disaccharide, in addition to the water-soluble dietary fiber. A new water-soluble dietary fiber-containing composition is provided.SOLUTION: The sugar heat condensation product (raw material) containing water-soluble dietary fiber is assimilated into levoglucosan assimilable microorganisms, and the water-soluble dietary fiber content in which the content of the water-soluble dietary fiber is increased as compared with the raw material A method for producing a water-soluble dietary fiber-containing composition to obtain a dietary fiber-containing composition. A sugar heat condensation product (raw material) containing water soluble dietary fiber, monosaccharide and levoglucosan is assimilated into levoglucosan assimilable microorganism to reduce the amount of monosaccharide and levoglucosan contained in the raw material And reducing the content of monosaccharide and levoglucosan therein. A water-soluble dietary fiber-containing composition, wherein the content of the water-soluble dietary fiber is 90 mass% or more based on the solid content, and the content of the monosaccharide and levoglucosan is 1 mass% or less, respectively.Selection drawing None【課題】水溶性食物繊維以外に単糖及びレボグルコサン、場合により二糖などを含有する糖加熱縮合物の水溶性食物繊維含有量を高める方法を提供する。新たな水溶性食物繊維含有組成物を提供する。【解決手段】水溶性食物繊維を含有する糖加熱縮合物(原料)をレボグルコサン資化性微生物に資化させて、原料に比べて固形分基準で水溶性食物繊維の含有量が増加した水溶性食物繊維含有組成物を得る、水溶性食物繊維含有組成物の製造方法。水溶性食物繊維、単糖およびレボグルコサンを含有する糖加熱縮合物(原料)をレボグルコサン資化性微生物に資化させて、原料に含有される単糖およびレボグルコサンの量を低減する、糖加熱縮合物中の単糖およびレボグルコサン含有量を低減する方法。固形分基準で水溶性食物繊維の含有量が90質量%以上であり、単糖及びレボグルコサンの含有量がそれぞれ1質量%以下である水溶性食物繊維含有組成物。【選択図】なし
