Abstract
Cell wall composition affects the texture of plant-based foods. In addition, the main components of plant cell walls are dietary fiber constituents and are responsible for potential physiological effects that are largely affected by the structural composition of the cell walls. Radish (Raphanus sativus L. var. sativus) is known to develop a woody and firm texture during maturation and ripening, most likely due to changes in the cell wall composition. To describe these changes chemically, radish was cultivated and harvested at different time points, followed by detailed chemical analysis of insoluble fiber polysaccharides and lignin. During maturation, changes in polysaccharide profiles were observed, with a decrease in the portion of neutral pectic side chains and an increase in the xylan portion being predominant. Radish lignin was characterized by unexpectedly high incorporation of p-coumaryl alcohol into the polymer. Maturation dependent increases in lignin contents were accompanied by compositional changes of the lignin polymers with sinapyl alcohol being preferentially incorporated.
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