Limonoid glucosides in citrus seeds.

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Abstract
The amounts of limonoid glucosides were measured in the seeds of grapefruit (Citrus paradisi), lemon (C. limori), Valencia orange (C. sinensis) tangerine (C. reticulata), Fukuhara (C. sinensis Osbeck Hort.), Hyuganatsu (C. tamurana Hort. ex Tanaka), Shimamikan (C. kinokuni Hort. ex Tanaka) and Sanbokan (C. sulcata Hort. ex Takahashi). All the seeds contained 17-β-Dglucopyranosides of limonin, nomilin, obacunone, deacetylnomilin, nomilinic acid and deacetylnomilinic acid. The total limonoid glucoside content ranged from 0.31 to 0.87% of the dry weight. The concentration of nomilin glucoside was highest among the glucosides found in the seeds. All the seeds also contained the major neutral limonoid aglycones commonly found in citrus, namely limonin, nomilin, deacetylnomilin, obacunone and ichangin. As previously reported, limonin was the predominant aglycone.

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