PROBLEM TO BE SOLVED: To provide a highly safe new oligosaccharide usable for a medicine, a food and drink, a fodder or the like, and having excellent stability and &alpha-glucosidase-inhibiting activity, and to provide a method for producing the oligosaccharide, and an &alpha-glucosidase inhibitor containing the oligosaccharide.SOLUTION: The new oligosaccharide is typified by &alpha-D-glucopyranosyl-(1&rarr4)-[&beta-D-glucopyranosyl-(1&rarr6)]-&alpha-D-glucopyranosyl-(1&rarr4)-D-glucopyranoside. The &alpha-glucosidase inhibitor contains the oligosaccharide. The method for producing the oligosaccharide includes hydrolyzing a roasted dextrin with an acid, and collecting the specified oligosaccharides from a decomposed product obtained by digesting the hydrolyzate with an &alpha-amylase, and successively digesting the digested product with a glucoamylase.COPYRIGHT: (C)2009,JPO&INPIT【課題】安全性が高く、医薬品、飲食品、飼料等への使用が可能な、安定性に優れたα-グルコシダーゼ阻害活性を有する新規オリゴ糖、その製造方法、それを含有するα-グルコシダーゼ阻害剤を提供すること。【解決手段】新規なα-D-グルコピラノシル-(1→4)-[β-D-グルコピラノシル-(1→6)]-α-D-グルコピラノシル-(1→4)-D-グルコピラノシドで代表されるオリゴ糖、及びそれを含有するα-グルコシダーゼ阻害剤、並びに焙焼デキストリンを酸で加水分解し、さらにα-アミラーゼ、次いでグルコアミラーゼで消化して得られる分解物から、特定のオリゴ糖を採取するオリゴ糖の製造方法。【選択図】なし
