Dietary fiber analysis can be subdivided into gravimetric and component analysis procedures. Gravimetric methods are simpler and faster than component analysis methods but are limited to estimates of total dietary fiber (TDF) or soluble (SDF) and insoluble (IDF) components. Conversely, component analysis allows for the determination of individual sugars, both neutral and acidic (i.e. uronic acids), as well as a separate estimation for lignin in some cases. The TDF content can then be calculated as the sum of these components. A drawback of component analysis is that the procedures are longer and more complex, rendering them less suitable for routine dietary analysis. Table 1 summarizes the methods that have been collaboratively studied and used in the development of fiber tables.
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