title: Effects of purified dietary fiber sources on beta-carotene utilization by the chick.
abstract: Effects of various purified dietary fiber components on beta-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 beta-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 beta-carotene utilization by the chick, as measured by percentage of consumed beta-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 beta-carotene utilization. Thus, several purified forms of dietary fiber significantly reduced beta-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 beta-carotene utilization.
mesh_terms: D000818:Animals; D001682:Biological Availability / Q000187:drug effects; D002338:Carotenoids / Q000378:metabolism*; D002645:Chickens / Q000378:metabolism*; D004043:Dietary Fiber / Q000494:pharmacology*; D004435:Eating / Q000187:drug effects; D005260:Female; D008297:Male; D008433:Mathematics; D008970:Molecular Weight; D010368:Pectins / Q000494:pharmacology; D014802:Vitamin A Deficiency / Q000378:metabolism; D019207:beta Carotene
chemical_list: D004043:Dietary Fiber; D019207:beta Carotene; D002338:Carotenoids; D010368:Pectins; C003181:polygalacturonic acid