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• W1977156960 abstract "Compositional information for lignins in food is rare and concentrated on cereal grains and brans. As lignins are suspected to have important health roles in the dietary fiber complex, the confusing current information derived from nonspecific lignin determination methods needs to be augmented by diagnostic structural studies. For this study, lignin fractions were isolated from kiwi, pear, rhubarb, and, for comparison, wheat bran insoluble dietary fiber. Clean pear and kiwi lignin isolates allowed for substantive structural profiling, but it is suggested that the significance of lignin in wheat has been overestimated by reliance on nonspecific analytical methods. Volume integration of NMR contours in two-dimensional 13C−1H correlation spectra shows that pear and wheat lignins have comparable guaiacyl and syringyl contributions and that kiwi lignins are particularly guaiacyl-rich (∼94% guaiacyl) and suggest that rhubarb lignins, which could not be isolated from contaminating materials, are as syringyl-rich (∼96% syringyl) as lignins from any known natural or transgenic fiber source. Typical lignin structures, including those newly NMR-validated (glycerols, spirodienones, and dibenzodioxocins), and resinols implicated as possible mammalian lignan precursors in the gut are demonstrated via their NMR correlation spectra in the fruit and vegetable samples. A novel putative benzodioxane structure appears to be associated with the kiwi lignin. It is concluded that the fruits and vegetables examined contain authentic lignins and that the detailed structural analysis exposes limitations of currently accepted analytical methods. Keywords: Dietary fiber; plant cell wall; dioxane−water milled lignin; ball-milling; acidolysis lignin; pear; kiwi; rhubarb; wheat; NMR; HSQC; HMBC; gut fermentation; lignans" @default.
• W1977156960 created "2016-06-24" @default.
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• W1977156960 date "2006-09-14" @default.
• W1977156960 modified "2023-10-01" @default.
• W1977156960 title "NMR Characterization of Lignins Isolated from Fruit and Vegetable Insoluble Dietary Fiber" @default.
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• W1977156960 doi "https://doi.org/10.1021/jf061525z" @default.
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