[in Japanese]

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[in Japanese]

View full abstract

[in Japanese]

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[in Japanese]

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We researched the effects of the wave length of sunlight on the deterioration of sake quality by irradiating sunlight through sharp cut filters which block light under a specific wave length and pass light over a specific wave length. To measure deterioration of sake quality, we analyzed sake coloring, harman, antioxidant capacity, value of TBA reaction, and 3-D-G (3-Deoxygulucosone) of the sake following irradiated sunlight through a sharp cut filter. As a result, we found that sunlight under a 440 nm wave length deteriorates sake quality and that sunlight of over a 440 nm wave length does not. We then attempted to make a new glass bottle which blocks the light under a 440 nm wave length and has high transmittance of light over a 440 nm wave length. We developed a new glass bottle which maintained sake quality in spite of being irradiated with sunlight and which allows more transparency than the amber glass in current use.

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