PROBLEM TO BE SOLVED: To provide an ultraviolet sterilization method and an ultraviolet sterilization device capable of conducting effectively ultraviolet sterilization to a liquid containing an organic article and water such as vegetable juice without deteriorating flavor thereof.SOLUTION: There is provided an ultraviolet sterilization method without deteriorating taste or flavor by reducing or removing dissolved oxygen contained in a liquid to be sterilized, selectively irradiating ultraviolet in wavelength region of 253 nm to 280 nm without contacting the liquid to be sterilized with an optical catalyst substance and suppressing generation of active species, when sterilization is conducted by irradiating ultraviolet to the liquid to be sterilized containing a solution or a dispersion containing an organic article and water. In this time, it is preferable that the ultraviolet is irradiated from 1 direction or 2 directions facing each other, and further width of a light axis direction of the ultraviolet irradiated in the region is width with which the ultraviolet is irradiated to all liquid to be sterilized existing in the region.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2018,JPO&INPIT【課題】野菜ジュースなどの有機物並びに水を含む液体に対して、その風味を損なうことなく効率的に紫外線殺菌を行うことが可能な紫外線殺菌方法及び紫外線殺菌装置の提供。【解決手段】有機物並びに水を含有する溶液又は懸濁液からなる被殺菌液体に紫外線を照射して殺菌を行うに際して、被殺菌液体に含まれる溶存酸素を低減或いは除去し、被殺菌液体を光触媒物質と接触させることなく、253nm以上280nm以下の波長領域の紫外線を選択的に照射し、活性種の発生を抑えることで味覚や風味が損なわれない、紫外線殺菌方法。このとき、紫外線は1方向又は互いに対向する2方向から照射し、更に前記領域における照射される紫外線の光軸方向の幅を、当該領域に存在する全ての被殺菌液体に前記紫外線が照射されるような幅とすることが好ましい。【選択図】図2
