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steps as for the total, insoluble and soluble gravimetric method mentioned above.
This method can be used to determine the total, soluble and insoluble fiber
contents of foods, but does not provide information about the lignin content. This is
because lignin is not a polysaccharide, and so it is not broken down to
monosaccharides during the acid digestion. For most foods this is not a problem
because they have low lignin concentrations anyway. If a food does contain significant
amounts of lignin then another method should be used, e.g., the gravimetric method or
more sophisticated chemical methods (e.g., the Theander-Marlett method).
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