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Journal of Nutrition Vol. 110 No. 6 June 1980, pp. 1130-1137
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Bile Salt Adsorption Ability of Dietary Fiber from Named Varieties of Carrot at Different Developmental Ages1

J. A. Robertson*, M. A. Eastwood* and M. M. Yeoman{dagger}

* Wolfson Gastrointestinal Laboratory, Gastrointestinal Unit, Department of Medicine, Western General Hospital {dagger} Edinburgh University, Department of Botany, King's Buildings, Mayfield Road, Edinburgh, Scotland

The adsorption of bile salts to fiber has been measured using fiber prepared from different varieties of carrot at different developmental ages. We investigated the carrot varieties Altrinchan and Chantenay and used the bile salts deoxycholate and glycocholate. The method used to measure adsorption distinguished between true adsorption and apparent adsorption due to bile salts trapped within the interstices of the fiber matrix. Adsorption ability was influenced by the developmental age of the carrot but not by variety. Adsorption ability was at a maximum when the carrot fresh weight was at a maximum. The adsorption ability measured was true adsorption and was not dependent on the water holding capacity of the fiber. Deoxycholate was better adsorbed than glycocholate and the results suggest that the developmental age of a fiber source could be important when formulating diets designed to influence bile salt metabolism.

KEY WORDS: • dietary fiber • bile salts • adsorption ability • carrot

1 This research was supported by the British Nutrition Foundation and Reckitt and Colman.

Manuscript received 22 October 1979.




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