Table 2

Enzyme activities in duodenal juice

	Interdigestive	Early/maximal postprandial	Late/mean postprandial
Data are derived from studies using test meals with 300–600 kcal and using no or only low marker perfusion rates (⩽3 ml/min). References for lipase are given in the text.
Lipase (U/ml)	100–400	500–1500	400–1000
Amylase (U/ml)	100⁵⁰–150⁴²	150⁵⁰–300^42,⁵¹	150^18,^50,⁵¹–300⁴²
Trypsin (U/ml)	20–50^42,⁵¹	80^26,^42,⁵¹–180¹²	60–100^26,^42,⁵¹–150¹²