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Journal articles
Exogenous and endogenous nitrogen flow rates and level of protein hydrolysis in the human jejunum after [15N]milk and [15N]yoghurt ingestion
Abstract : Milk and yoghurt proteins were I5N-labelled in order to measure the flow rate of exogenous N during digestion in the human intestine. After fasting overnight, sixteen healthy volunteers, each with a naso-jejunal tube, ingested either [15N]milk (n 7) or [I5Njyoghurt (n 9). Jejunal samples were collected every 20 min for 4 h. A significant stimulation of endogenous N secretion was observed during the 20-60 min period after yoghurt ingestion and the 20-40 min period after milk ingestion. The endogenous N flows over a 4 h period did not differ between the groups (44.3 (SEM 6.5) mmol for milk and 63.5 (SEM 5.9) mmol for yoghurt). The flow rates of exogenous N indicated a delayed gastric emptying of the yoghurt N compared with N from milk. The jejunal non-protein N (NPN) flow rate increased significantly after milk and yoghurt ingestion due to an increase in the exogenous NPN flow rate. The NPN fraction of exogenous N ranged between 40 and 80%. The net gastro-jejunal absorption of exogenous N did not differ significantly between milk (56.7 (SEM 85) YO) and yoghurt (50-9 (SEM 7) YO). The high level of exogenous N hydrolysis is in accordance with the good digestibility of milk products. Fermentation modifies only the gastric emptying rate of N and does not affect the level of diet hydrolysis, the endogenous N stimulation or the digestibility rate.
Cited literature [17 references]
https://hal-agroparistech.archives-ouvertes.fr/hal-02484989
Contributor : Claire Gaudichon <>
Submitted on : Wednesday, February 19, 2020 - 6:26:38 PM
Last modification on : Wednesday, January 27, 2021 - 3:42:07 PM
Long-term archiving on: : Wednesday, May 20, 2020 - 5:42:32 PM
Contributor : Claire Gaudichon <>
Submitted on : Wednesday, February 19, 2020 - 6:26:38 PM
Last modification on : Wednesday, January 27, 2021 - 3:42:07 PM
Long-term archiving on: : Wednesday, May 20, 2020 - 5:42:32 PM
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