Dietary Fiber, Total (CODEX Definition)

PDFdnwIcon Testing Service Catalog (PDF) Print Email


Price of the test:

$405 per analysis

Acceptable Matrices:

All food products

Unacceptable Matrices:

Some matrices may be identified as incompatible with this assay as the method is utilized more extensively. To date, no unacceptable matrices have been identified.

Limit of Detection:


Limit of Quantitation:


Sample Size Requirements:

40 grams



Reportable Units:

Percent by weight of sample received

Turn Around Time:

15 Business Days - RUSH is available (7 Business Days) please call to ensure timing

Is Rush Available?


Method Reference:

AOAC 2009.01

Method Description:

Samples (defatted if necessary) are digested 16 hours in a manner that simulates the human digestive system with 3 enzymes (pancreatic alpha-amylase, protease, and amyloglucosidase) to remove starch and protein. Ethanol is added to precipitate high molecular weight soluble dietary fiber. The resulting solution is filtered and the residue is dried and weighed. Protein and ash are determined on the residue. The filtrate is captured, concentrated, and analyzed via HPLC to determine the value of low molecular weight soluble dietary fiber (LMWSF).

Total dietary fiber (TDF) is calculated as the weight of the residue minus protein and ash plus the low molecular weight soluble fiber determined by HPLC analysis.

Information Required by Submitter:

Please supply expected estimates. Indicate matrix type and indicate high fat (>5%) and high protein (>20%) samples. Indicate whether the sample contains fructans (inulin or fructooligosaccarides (FOS)), or psyllium, flax and gum (i.e. guar gum).

Additional Information:

Measures total dietary fiber including resistant starch and low molecular weight non-digestible oligosaccharides of DP =3.  If a breakout of soluble and insoluble fiber as well as total dietary fiber is desired please choose our Total, Soluble, and Insoluble Dietary Fiber CODEX Definition method.

Dietary Fiber is the portion of the carbohydrates which is not digested in the human gut. It is composed of both soluble and insoluble components. High-fat (>5%) and high-protein (>20%, depending on matrix) samples require special handling.