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Effects of Purified Dietary Fiber Sources on ß-Carotene Utilization by the Chick

Department of Food Science ^* Department of Animal Sciences, University of Illinois, Urbana, IL 61801

Effects of various purified dietary fiber components on ß-carotene utilization by the chick were investigated in two experiments (expt.). Eight-day-old Columbian x New Hampshire male (expt. 1) or female (expt. 2) chicks were fed a vitamin A-deficient diet for 1 wk and then fed ß-carotene-supplemented diets containing 0% fiber, 7% arenaceous flour or 7% of a purified fiber source for 4 wk. Results of expt. 1 showed that hemicellulose, lignin and citrus pectin, but not arenaceous flour or polygalacturonic acid, depressed ß-carotene utilization by the chick, as measured by percentage of consumed ß-carotene stored in liver as vitamin A relative to the 0% fiber control. In expt. 2, effects of the methoxyl content of pectin were studied. High and medium methoxyl apple pectin, citrus pectin and polygalacturonic acid reduced storage of vitamin A in liver. Low methoxyl apple pectin had no significant effect on ß-carotene utilization. Thus, several purified forms of dietary fiber significantly reduced ß-carotene utilization by chicks when fed at the 7% supplementary level. Moreover, with pectin, there was an inverse relationship between methoxyl content of pectin and ß-carotene utilization.

KEY WORDS: • ß-carotene • pectin • vitamin A • fiber • chick

¹ Current address: Kraft Inc., 801 Waukegan Rd., Glenview, IL 60025.

Manuscript received 11 February 1986. Revision accepted 17 July 1986.