Try Isolife in Wageningen. They produce highly labeled plant materials.
>===== Original Message From Stable Isotope Geochemistry
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>Is anyone aware of a commercial supplier of plant material labeled with
>13C? We are particularly interested in buying potential biofuel crops
>(miscanthus, switchgrass, corn, sugarcane) that have been grown under
>enriched 13CO2. Does anyone have any suggestions on where (or if!) such an
>item can be bought?
Dept. of Biological Sciences
Northern Arizona University
Flagstaff AZ 86011-5640
phone: 928 523 0432
fax: 520 523 7500