Research on Removing Allyl Isothiocyanates Using High Pressure Carbondioxide
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摘要: 由于紫甘蓝色素提取物中存在硫苷的降解产物烯丙基异硫氰酸酯（Allyl Isothiocyanates，AITC），因而限制了紫甘蓝色素提取物的工业应用。为了解决这一实际生产问题，以AITC溶液为实验材料，分析了不同压强和温度下高压二氧化碳（High Pressure Carbon Dioxide，HPCD）脱除AITC的过程。结果表明：HPCD脱除AITC的过程符合一级动力学模型；增大压强对脱除速率和半衰期影响不显著（P0.05），表明压强不是影响HPCD脱除AITC的主要因素；温度的升高使脱除速率增大了约2倍，半衰期明显减小，表明温度可能是影响HPCD脱除AITC的主要因素。通过进一步模拟分析HPCD作用下AITC的降解，确认了HPCD脱除AITC过程中热降解发挥的重要作用。Abstract: Allyl Isothiocyanates (AITC) is a degradation product of thioglycoside in the red cabbage pigment extract, which limits the industrial applications of red cabbage pigment extract. In order to solve this actual production problem, the process and possible mechanism of removing AITC using high pressure carbon dioxide (HPCD) under different pressures and temperatures are analyzed with the AITC solution as experimental material. The results show that the removing process of AITC using HPCD follows the first-order kinetics model. Pressure is a non-significant factor (P0.05) for the removing rate and half-life period, which indicates that the treatment pressure has little influence on the removing of AITC. Elevating treatment temperature can improve the removing rate of AITC nearly twice, and also shorten the half-life period, which indicates that the treatment temperature has more influence on the removing of AITC. The significant effect of the thermal degradation during the removing process of AITC by HPCD is verified by the further analysis.
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Key words:
- high pressure carbon dioxide /
- allyl isothiocyanates /
- removing
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