超临界CO_2萃取技术提高辣椒红色素品质的研究

Study on supercritical CO_2 extraction technique to improve the quality of paprika oleoresin

以萃取高纯度辣椒红色素的色价、吸光比、去除产品中的异味为目的,采用传统的溶剂法辣椒红色素为原料,用CO2超临界萃取为手段,系统的分析了CO2超临界的工作压力、流量、温度、时间,对辣椒红色素提纯的影响,通过UVPC-2401分光光度法对萃取产品进行了分析测试,确定了超临界萃取溶剂法生产的辣椒红色素的最佳工艺条件。由于温度对色素的热稳定性影响较大,本文对常温、40℃、50℃进行了研究,在一定的压力下,确定了40℃为最佳温度条件;在一定的温度下,压力低于15MPa色素有气味,20MPa下无气味无夹带,25MPa下有夹带,确定了压力为20MPa;CO2流量过大,增加推动力,确定了流量为0.3m3/h。以上条件下可以显著去除产品的异味,提高产品的色价、吸光比,经CO2超临界萃取的产品满足高端用户的需求。

In order to get higher color value and absorbance ratio with little smell of paprika oleoresin supercritical CO2 fluid extraction was applied to refined the oleoresin extracted by solvent.The influence of pressure,temperature,extraction time and flow rate of Supercritical CO2 were studied.Through the analysis of final product by UVPC-2401,it showed that temperature plays a very important part in the thermal stability of Paprika Oleoresin.Room temperature,40℃ and 50℃ were selected to compare.It showed that under a certain pressure,40℃ was the best.Under a certain temperature,the oleoresin with a little smell was found under the pressure of 15 MPa and no smell and no entrainment was observed under the pressure of 20 MPa;however,under the pressure of 25MPa,the oleoresin was no smell but has entrainment.Therefore,20MPa is the best.The best flow rate of CO2 was 0.3m3/ h.Under the above optimum conditions,the high color value and absorbance ratio with no smell of paprika oleoresin was obtained.The supercritical CO2 refine extraction could meet the high-quality needs customers.