小麦胚芽油超临界萃取.doc

超临界 CO 2 萃取小麦胚芽油工艺研究摘要: 超临界 CO 2 对小麦胚芽进行超临界萃取。以小麦胚芽油得率为考察指标, 考察了萃取压力、温度、时间、小麦胚芽粒度 4 个条件对超临界 CO 2 流体萃取小麦胚芽油的影响。结果表明萃取压力 30MPa ,萃取温度 45℃,小麦胚芽粒度为 100 目的条件下萃取 为最佳工艺,小麦胚芽油得率达 %。关键词: 超临界 CO 2 ;小麦胚芽油;萃取 Technological Study on Extraction of Oil from Wheat Germ by Supercritical CO 2 Abstract: The oil of wheat germ was extracted by supercritical carbon dioxide. With wheat germ oil yield as index, single factor experiment was used to study the influences of extracting conditions on the yield of oil,as extraction pressure, temperature, time and condition of wheat germ size. The optimum extracting parameters were established with extracting pressure of 30MPa, extracting temperature of 45℃, wheat germ granularity for 100 purposes and the extracting time of h. The optimum technology for supercritical CO 2 extraction of oil from wheat germ was high efficient, and the yield of wheat germ oil was up to %. Key words: supercritical CO 2 extraction; wheat germ oil. extraction 小麦胚芽是小麦制粉的副产品,是小麦籽粒中生理活性最强的部分,其含量占麦粒重量的 2%—3% [1]。小麦胚芽含有多种营养成分,如胚芽蛋白、胚芽油脂、维生素、矿物质等,被誉为天然的营养宝库[2]。小麦胚芽油约占小麦胚芽干重的 10左右,由于其富含许多不饱和脂肪酸,维生素 E、亚油酸、二十八碳醇、磷脂和一些脂溶性色素等,是一种品质极高的高级营养保健油,其主要功能有改善人体的机能状态、促进人体微循环、降低血脂,对预防及辅疗心脏病、高血压、高血脂、动脉硬化、糖尿病有一定功效,还具有充沛精力,滋润养颜,防老抗衰, 减少疲劳的作用[3]。超临界 CO 2 萃取技术具有操作简单、节能环保、操作温度低、萃取效率高等优点,作为一种环保型的绿色分离技术现已在天然产物提取研究中得到广泛应用[4]。本研究以 CO 2 超临界装置萃取小麦胚芽油得率为考察指标,对萃取涉及的压力、温度、时间, 小麦胚芽颗粒度大小等主要工艺参数进行了实验探讨