PDF(Pubmed)
Abstract：
Coffee silverskin is a byproduct of the coffee industry, appearing in large quantities during the roasting step. In this work, a sober and simple water process is proposed, using extractions cycles, to produce valuable products including (a) an extract rich in caffeine, (b) possibly pure caffeine, and (c) insoluble fibers. The hypothetical number of necessary cycles was calculated and compared to the number of cycles used experimentally. Two types of cycles, with and without water compensation, were compared for their water consumption and the amount of caffeine extracted. The use of cycles, with the resulting product from a previous extraction as a solvent for fresh biomass, drove a significant rise in the content of caffeine determined by a UV-visible detector with a spectrophotometer and ultra-performance liquid chromatography (UPLC). After 11 extraction cycles with water compensation, we obtained an extract 4.5 times more concentrated in caffeine (4.25 mg/mL) than after a single extraction (1.03 mg/mL).
摘要：
咖啡silverskin是咖啡行业的副产品，在烘烤步骤中大量出现。在这项工作中,提出了一个清醒而简单的水过程，使用提取循环，生产有价值的产品，包括（a）富含咖啡因的提取物，(b)可能是纯咖啡因，和(c)不溶性纤维。计算假设的必要循环数,并与实验使用的循环数进行比较。两种类型的循环，有和没有水补偿，比较了他们的用水量和咖啡因的提取量。循环的使用，用先前提取的产物作为新鲜生物质的溶剂，通过分光光度计和超高效液相色谱（UPLC）的紫外可见检测器测定的咖啡因含量显着上升。经过11个用水补偿的提取循环后，我们获得的提取物中咖啡因的浓度（4.25mg/mL）比单次提取（1.03mg/mL）高4.5倍。
