From: Kimberley Cousins (kcousins$##$csusb.edu)
Date: Mon Nov 06 2000 - 19:00:26 EST
To all:
Have any of you encountered mislabelled carvone? We have two different
bottles purchased two different dates from Aldrich and from Acros in which
the L(-) carvone actually has a positive optical rotation, and the D(+)
carvone has a negative optical rotation. We've checked our polarimeter
with other optically active materials, and determined that it is *not* an
instrument problem. The two bottles in question were purchased between
fall 1998 and fall 2000. We've also determined that most carvone produced
is not isolated from the natural oils, but is synthesized from limonene.
Any insight would be appreciated.
Kimberley Cousins
Associate Professor of Chemistry
California State University, San Bernardino
5500 University Parkway
San Bernardino, CA 92407
(909)880-5391
kcousins$##$csusb.edu
http://chem.csusb.edu/~kcousins
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