分子蒸馏技术纯化辣椒红色素的研究

Purifi cation of capsanthin by molecular distillation

以刮膜式分子蒸馏装置对辣椒红色素的纯化工艺进行了研究,考察了蒸馏压力、刮膜转速、蒸馏温度及冷凝温度对辣椒红色素纯化效果的影响,并通过正交试验得到最佳工艺参数:蒸馏压力10 Pa、刮膜转速300 r/min、蒸馏温度80℃、冷凝温度15℃。最终产品的检测结果表明:分子蒸馏法能有效地除去辣椒红色素中的辣素和臭味物质,产品的各项指标均符合GB10783—2008要求。

Graphene aerogel （GA） was prepared by sol-gel chemistry, and then GA/epoxy （EP） composites were prepared by sonicate-mixing method. The structure of GA was characterized by SEM, N2 nitrogen sorption tests, XPS and XRD. In addition, the effects of GA mass fraction on the thermal property and the conductivity property of the GA/EP composites were also investigated. The results indicate that the GA shows a three-dimensional network of randomly oriented graphene sheets with wrinkled texture, and is rich in pores. After thermal reduction, the specific surface area of GA increases to 731.84 m2 ·g-1, the interlayer spacing of the graphene decreases to 0.347 nm, and the oxygen-containing functional groups are almost all removed. DMA and electrical conductivity testing results show that with the increase of GA content, Tg of GA/EP composites increases first and then decreases, and the electrical conductivity increases with the percolation threshold of 0.05%-0.3%.