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Nominal Response of Passage Rates to Fiber Particle Size in Rats^{1, 2,}

Department of Food Science and Technology, Oregon State University, Corvallis, OR 97331-6602

The influence of wheat bran particle size on the rate of passage of digesta through the rat gut was investigated. Small and large particle size wheat bran-supplemented diets were used in combination with the particulate digestion marker chromium mordanted bran (CrMB) and the soluble digestion marker cobalt-EDTA (Co EDTA). The particle size of CrMB did not significantly affect the estimates of marker residence halftime (t_1/2), mean retention time or transit time, when administered to animals fed a large particle bran diet. Utilization of different particle size bran diets and a common small particle CrMB marker tended to result in a longer t_1/2 and mean retention time in the smaller particle bran diet. Therefore, the selection of dietary particle size, but not CrMB particle size, tended to influence the estimates of t_1/2 and mean retention time. Similarly, the Co EDTA t_1/2, mean retention time and transit time tended to be longer in small particle bran-fed animals than in large particle bran-fed animals. In some comparisons the mean retention time of Co EDTA was significantly less (P < 0.05) than that of CrMB, indicating that preferential retention of particles relative to solutes can occur in rats. Nevertheless, the overall movement of the liquid and particles largely corresponded.

KEY WORDS: • rate of passage • particle size • wheat bran • pectin • rats

¹ Supported by a grant from the American Institute for Cancer Research.

² Oregon State University Agricultural Experiment Station Technical Publication number 9472.

³ To whom correspondence should be addressed.

Manuscript received 27 December 1990. Revision accepted 13 June 1991.