The effect of diet on retention by the rat of iron from a radiolabeled casein test meal.
Previous work has shown that weanling rats fed a soy protein isolate (SPI)-based diet retained less iron from a casein test meal than did rats fed a casein-based diet. In the present work this diet effect was further investigated. In experiment 1 rats were fed either SPI-or casein-based diet (about 25 ppm Fe) for 13 d, fasted overnight, given a 59Fe-labeled casein-based test meal, and refed either the same or the other diet for 7 d. 59Fe retention was determined by the percent of ingested label retained after 7 d. SPI reduced 59Fe retention when fed prior to the test meal (52.5 vs. 61.5%, P less than 0.001) and also when fed following the test meal (50.8 vs. 63.2%, P less than 0.001). In experiment 2a, exposure of SPI to steam at 108 degrees C for 30 min did not lessen the observed diet effect. In experiment 2b rats were fed either an SPI-or casein-based diet, and casein test meals were fed as above on days 14, 35 and 56. The SPI-based diet reduced 59Fe retention from the casein test meal fed on d 14 (58.2 vs. 68.0%, P less than 0.005), for the meal on d 35 there was no difference, and for the final test meal rats fed SPI retained more 59Fe (53.0 vs. 40.2%, P less than 0.01). In experiment 3 lactalbumin was shown to decrease 59Fe retention to the same extent as SPI (54.9 and 53.4%) as compared to casein (73.3%), whereas neither rapeseed protein concentrate (68.8%) nor oxalic acid (72.2%) had any significant adverse effect.(ABSTRACT TRUNCATED AT 250 WORDS)
D000818:Animals; D001835:Body Weight; D002364:Caseins / Q000378:metabolism*; D004044:Dietary Proteins / Q000494:pharmacology*; D006454:Hemoglobins / Q000378:metabolism; D007501:Iron / Q000378:metabolism*; D008297:Male; D010940:Plant Proteins / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains; D013025:Glycine max
D002364:Caseins; D004044:Dietary Proteins; D006454:Hemoglobins; D010940:Plant Proteins; D007501:Iron