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[U - 14 C]-Labelled 1,2,3,4,6-penta-O-galloyl-β-ᴅ-glucose was prepared by photoassimilation of  14 CO 2  with leaves from staghorn sumac (Rhus typhina) in the presence of the herbicide glyphosate. Extracts of the plant material were partitioned against ethyl acetate and chromatographed on Sephadex LH-20, yielding a series of crude tri-to decagalloylglucoses. The pentagalloylglucose fraction among these was further purified by HPLC to &gt;99% purity and a specific radioactivity of 130 kBq (3.5 μCi) per μmol. The ratio of the radioactivities in the glucose and galloyl moieties, respectively, suggested a uniform labelling pattern of the product.

Preparation of [ 14 C]-Labelled 1,2,3,4,6-Penta-O-Galloyl-β-ᴅ-Glucose and Related Gallotannins