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Rapid and Continuous Astaxanthin Isomerization in Subcritical Ethanol
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-09-24 , DOI: 10.1021/acs.iecr.1c02101 Masaki Honda 1 , Kazuya Murakami 1, 2 , Yelin Zhang 1, 2 , Motonobu Goto 2
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-09-24 , DOI: 10.1021/acs.iecr.1c02101 Masaki Honda 1 , Kazuya Murakami 1, 2 , Yelin Zhang 1, 2 , Motonobu Goto 2
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Recent studies have shown that Z-isomers of astaxanthin have greater bioavailability and biological activity than the all-E-isomer. Hence, it is important to develop efficient and practical Z-isomerization methods. This study attempted to establish a continuous-flow isomerization system for (all-E)-astaxanthin in subcritical ethanol. Specifically, the effects of temperature, pressure, time, and addition of antioxidants and a natural catalyst, allyl isothiocyanate, on the Z-isomerization and degradation were investigated. Continuous high-temperature processing (>140 °C) efficiently promoted astaxanthin Z-isomerization within a few minutes, but simultaneously accelerated its degradation. We found that the thermal degradation could be inhibited by adding specific antioxidants, especially ascorbic acid. Finally, using the continuous-flow system with ascorbic acid, 60.3% of total Z-isomer ratio of astaxanthin was achieved while inhibiting the degradation at 200 °C and 10 MPa in just 30 s. This efficient and environmentally friendly isomerization technology is an effective means for the production of Z-isomer-rich astaxanthin materials.
中文翻译：
亚临界乙醇中快速连续的虾青素异构化
最近的研究表明，虾青素的Z异构体比全E异构体具有更高的生物利用度和生物活性。因此，开发高效实用的Z-异构化方法非常重要。本研究试图建立亚临界乙醇中（全E）-虾青素的连续流动异构化系统。具体而言，研究了温度、压力、时间以及添加抗氧化剂和天然催化剂异硫氰酸烯丙酯对Z异构化和降解的影响。连续高温加工 (>140 °C) 有效促进虾青素Z- 几分钟内异构化，但同时加速其降解。我们发现可以通过添加特定的抗氧化剂，尤其是抗坏血酸来抑制热降解。最后，使用含有抗坏血酸的连续流系统，虾青素的Z-异构体比例达到60.3%，同时在 200 °C 和 10 MPa 下仅在 30 秒内抑制降解。这种高效环保的异构化技术是生产富含Z-异构体的虾青素材料的有效手段。
更新日期：2021-10-06
中文翻译：
亚临界乙醇中快速连续的虾青素异构化
最近的研究表明，虾青素的Z异构体比全E异构体具有更高的生物利用度和生物活性。因此，开发高效实用的Z-异构化方法非常重要。本研究试图建立亚临界乙醇中（全E）-虾青素的连续流动异构化系统。具体而言，研究了温度、压力、时间以及添加抗氧化剂和天然催化剂异硫氰酸烯丙酯对Z异构化和降解的影响。连续高温加工 (>140 °C) 有效促进虾青素Z- 几分钟内异构化，但同时加速其降解。我们发现可以通过添加特定的抗氧化剂，尤其是抗坏血酸来抑制热降解。最后，使用含有抗坏血酸的连续流系统，虾青素的Z-异构体比例达到60.3%，同时在 200 °C 和 10 MPa 下仅在 30 秒内抑制降解。这种高效环保的异构化技术是生产富含Z-异构体的虾青素材料的有效手段。
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