PROBLEM TO BE SOLVED: To provide a method for producing a water-soluble fraction of bamboo in which the content of harmful substances such as formaldehyde and methanol in the water-soluble fraction of bamboo obtained by a reduced pressure microwave steam distillation method is kept low. .. SOLUTION: In a method for producing an aqueous fraction of bamboo in which a gaseous distillate is obtained by irradiating bamboo with microwaves and heating, and then the gas tail is cooled into a liquid distillate, Is a method for producing a water-soluble fraction of bamboo, which has been grown for more than 2 years. [Selection diagram]【課題】減圧マイクロ波水蒸気蒸留法により得られる竹の水溶性画分中のホルムアルデヒドやメタノール等の有害物質の含有量が低く抑えられた竹の水溶性画分の製造方法を提供することである。【解決手段】竹にマイクロ波を照射して加熱することで気体状の蒸留物を得、次いでこの気体尾を冷却して液体状の蒸留物とする竹の水性画分の製造方法において、竹は生育期間が２年以上経過したものであることを特徴とする竹の水溶性画分の製造方法。【選択図】 図１
