Pressure-Assisted Chelating Extraction as a Teaching Tool in Instrumental Analysis

Supercritical Fluid Extraction versus Traditional Solvent Extraction of Caffeine from Tea Leaves: A Laboratory-Based Case Study for an Organic Chemistry Course

“…Although the use of SFE techniques has been embraced by the research and industrial communities, thorough coverage of this technique in most undergraduate textbooks and laboratories is lacking. In addition, although several experimental applications designed to introduce undergraduate students to supercritical fluids (SFs) have appeared in this Journal , − most are designed for upper-level analytical or physical chemistry laboratories and only a few − focus on the SFE of foods (fats; using SF carbon dioxide, CO 2 ). This laboratory introduces SFE to second-year organic chemistry students (exposing this technique to a much larger audience at an earlier career stage) in the context of a case-study, utilizes SF CO 2 with a modifier (10% ethanol), and focuses on the extraction of caffeine, an alkaloid, from tea leaves.…”