Department of Chemistry, Faculty of Science & Technology, Meijo University, 1-501 Shiogamaguchi, Tempaku-ku, Nagoya, Aichi 468-8502, Japan; Department of Materials Process Engineering, Nagoya University, Furo-cho, Nagoya, Aichi 464-8601, Japan.
Technical Center, Nagoya University, Furo-cho, Nagoya, Aichi 464-8601, Japan.
Food Res Int. 2023 Dec;174(Pt 1):113553. doi: 10.1016/j.foodres.2023.113553. Epub 2023 Oct 4.
The effects of light-emitting diode (LED) irradiation characterized by different emission wavelengths on the E/Z-isomerization and degradation of astaxanthin were investigated. LED irradiation slightly promoted Z-isomerization of astaxanthin, whereas the all-E-isomerization was highly efficiently promoted at specific wavelengths, especially at 365 nm. Astaxanthin isomers did not degrade significantly when dissolved in ethanol and subjected to LED irradiation conditions for 300 min. However, significant degradation was achieved when ethyl acetate was used for dissolution, and the samples were irradiated at the wavelength of 405 nm. The addition of α-tocopherol suppressed the photodegradation of astaxanthin. LED irradiation significantly affected the physical properties of astaxanthin Z-isomers. Irradiation with 365, 405, and 470 nm LEDs enhanced the color value (redness) and crystallinity of the Z-isomers via an all-E-isomerization reaction. These findings can contribute to the development of technologies that can arbitrarily control the E/Z-isomer ratio and physical properties of astaxanthin.
研究了不同发射波长的发光二极管（LED）照射对虾青素 E/Z-异构体转化和降解的影响。LED 照射轻微促进了虾青素的 Z-异构体转化，而在特定波长下，特别是在 365nm 时，全 E-异构体转化得到了高效促进。虾青素异构体在溶解于乙醇并在 LED 照射条件下 300 分钟时没有显著降解。然而，当使用乙酸乙酯溶解并在 405nm 波长下照射时，会发生显著降解。添加α-生育酚抑制了虾青素的光降解。LED 照射显著影响了虾青素 Z-异构体的物理性质。用 365、405 和 470nm LED 照射通过全 E-异构体转化反应增强了 Z-异构体的颜色值（红色）和结晶度。这些发现可以为开发能够任意控制虾青素 E/Z-异构体比例和物理性质的技术做出贡献。
