[Circadian variation of intestinal sucrose and water absorption in rats (author's transl)]

A rat jejunal segment of 15 cm length was perfused single pass with a 3 mmol/l sucrose solution 4 times daily at 8.00, 14.00, 20.00 and 2.00. One group of rats was fed ad libitum, a second group was "meal fed" between 14.00 and 18.00. Sucrose absorption reached its maximum at 8.00 in the rats fed ad libitum whereas it was spread over a period of six hours (20.00-2.00) in the meal fed rats. The activity of sucrase in mucosal scrapings reached its peak at feeding time.