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Searching for Rice Allelochemicals

An Example of Bioassay-Guided Isolation

^a USDA-ARS-NPURU, National Center for Natural Products Research, P.O. Box 8048, University, MS 38677
^b Weed Science, IRRI-KVL, Thorvaldsens vej 40, 1871 Fredericksberg C, Copenhagen, Denmark

View larger version (15K): [in a new window]   Fig. 1 General scheme for bioassay-guided isolation

View larger version (26K): [in a new window]   Fig. 2 Bioassay-guided fractionation of the root extract of rice cultivar TN1

View larger version (20K): [in a new window]   Fig. 3 Chromatogram of TN1 active fractions (A) L-2 and (B) M-1. Peaks at 4.9 and 6.2 min appear to be common between these two fractions