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Article
A Green Approach to Separate Spinach Pigments by Column Chromatography
Journal of Chemical Education
  • Aubrey Johnston, Boise State University
  • Jonathan Scaggs, Boise State University
  • Chris Mallory, Boise State University
  • Andrea Haskett, Boise State University
  • Don Warner, Boise State University
  • Eric Brown, Boise State University
  • Karen Hammond, Boise State University
  • Michael M. McCormick, Boise State University
  • Owen McDougal, Boise State University
Document Type
Article
Publication Date
6-1-2013
DOI
http://dx.doi.org/10.1021/ed300315z
Disciplines
Abstract

Chromatography has been a fundamental technique used for chemical separation that dates back to the 1850s. Specifically, column chromatography, typically taught in introductory organic chemistry laboratories, traditionally involves the use of halogenated or harmful solvents, which novice students often overuse. This situation runs contrary to the principles of responsible chemical and waste management emphasized by the green chemistry movement. Since this movement began, conventional means of separation using harmful solvents have been modified to emphasize the need for safer, less hazardous materials and the generation of such waste. The current experiment emphasizes the green chemical principles of renewable feedstocks and recycling to minimize waste, while simultaneously introducing or reinforcing common organic techniques, including solvent extraction, column chromatography, and thin-layer chromatography for the isolation and identification of photosynthetic pigments from spinach leaves. Students gain practical experience processing plant material to isolate and identify the pigments, β-carotene, xanthophylls, and chlorophyll a, using the solvents hexane and acetone. This experiment was designed for use as a standalone single-session lab or, alternatively, it can be coupled with an experiment to recycle waste acetone to further emphasize sustainable practices.

Citation Information
Aubrey Johnston, Jonathan Scaggs, Chris Mallory, Andrea Haskett, et al.. "A Green Approach to Separate Spinach Pigments by Column Chromatography" Journal of Chemical Education (2013)
Available at: http://works.bepress.com/owen_mcdougal/22/