NotesFAQContact Us
Collection
Advanced
Search Tips
Back to results
Peer reviewed Peer reviewed
Direct linkDirect link
ERIC Number: EJ951467
Record Type: Journal
Publication Date: 2011-Nov
Pages: 6
Abstractor: As Provided
ISBN: N/A
ISSN: ISSN-0021-9584
EISSN: N/A
Extraction, Purification, and Spectroscopic Characterization of a Mixture of Capsaicinoids
Wagner, Carl E.; Cahill, Thomas M.; Marshall, Pamela A.
Journal of Chemical Education, v88 n11 p1574-1579 Nov 2011
This laboratory experiment provides a safe and effective way to instruct undergraduate organic chemistry students about natural-product extraction, purification, and NMR spectroscopic characterization. On the first day, students extract dried habanero peppers with toluene, perform a pipet silica gel column to separate carotenoids from capsaicinoids, and perform thin-layer chromatography. On the second day, students characterize their mixture of capsaicinoids, approximating the relative quantities of the two primary capsaicinoids, capsaicin and dihydrocapsaicin, by NMR. Additionally, students are introduced to 2D NMR analysis. The effectiveness of the laboratory is assessed by two methods: a qualitative postlab student self-assessment and a quantitative pre- and postlab test. For the qualitative assessment, students stated that they acquired an improved understanding of NMR from the experiment. Accordingly, the total average on the quantitative prelab and postlab 8-point test increased from 3.43 plus or minus 1.62 (SD) to 4.25 plus or minus 1.48 (SD) and demonstrated a statistically significant improvement (p value of 0.001), as did the average for the 5-points of NMR-related questions in the prelab- and postlab 8-point test: 1.61 plus or minus 1.21 (SD) to 2.13 plus or minus 1.11 (SD), with p value of 0.004. (Contains 1 table and 6 figures.)
Division of Chemical Education, Inc and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Higher Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A