Abstract
Phenolic compounds of oilseed products are the hydroxylated derivatives of benzoic and cinnamic acids, coumarins, flavonoids, and lignins. Phenolic acids of rapeseed are in free, esterified, and insoluble bound forms. Phenolic esters and free phenolic acids constitute up to 80 percent and 16 percent of total phenolics of rapeseed, respectively, with sinapic acid being the predominant compound. The presence of tannins in cruciferae oilseeds has been documented through the formation of cyanidin, pelargonidin, and a n-butyl derivative of cyanidin artifact in hydrolytic products of rapeseed hulls. Recently, we reported that canola meals contained 0.68–0.77 percent tannins, as compared to 0.43–0.56 percent for Midas rapeseed meals. Rapeseed tannins are reported to cause tainting of eggs in laying hens. It has been suggested that rapeseed tannins block metabolism of trimethylamine (TMA) by inhibiting TMA oxidase, an enzyme that converts TMA to odorless water-soluble TMA-oxide. However, little is known about the rapeseed/canola tannin-protein interactions and their antinutritional effect in feeds. Ammoniated methanol removed 82 percent and 50 percent of esterified and free phenolic acids originally present in the seeds, respectively, though insoluble-bound phenolics were not affected, nearly half the tannins were removed by this treatment.
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Naczk, M., Shahidi, F. (1992). Phenolic Constituents of Rapeseed. In: Hemingway, R.W., Laks, P.E. (eds) Plant Polyphenols. Basic Life Sciences, vol 59. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3476-1_53
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DOI: https://doi.org/10.1007/978-1-4615-3476-1_53
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