Abstract
ARC/CL wheat flour and potato powder reference materials (RMs) prepared by the Central Laboratory of the Agricultural Research Centre of Finland, earlier specified for contents of essential and toxic trace elements, were characterized for contents of total dietary fiber (TDF). Recommended concentration values established were obtained on the basis of an interlaboratory comparison study conducted involving 10 reference laboratories recognized for their reliability in TDF determinations. The recommended TDF contents established were based on an enzymatic-gravimetric method employed by the participating laboratories to determine TDF or water insoluble (WIS) and water soluble (WS) DF which were then added up to obtain TDF. After exclusion of outliers the recommended concentration values were expressed as the medians ±95% confidence limits of the average values by the participating laboratories. The coefficient of variation obtained for the recommended concentration range of TDF was within 7% for both RMs.
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