Table 1.

Undigested human milk proteins (%) in an in vitro infant (0–3 months) model, based on the summed iBAQ values obtained by LC-MS/MS, categorized per biological function, for both colostrum and mature milk of 7 Chinese mothers averaged, and for gastric and intestinal digestion.

	Colostrum (week 1)		Mature milk (week 4)
Protein function groups	Gastric (%)	Intestinal (%)	Gastric (%)	Intestinal (%)
Blood coagulation	25	0	7	0
Cell	31	0	18	0
Enzyme	22	0	20	0
Immunity	29	2	32	3
Protease inhibitors	44	1	35	3
Protein synthesis	41	1	14	1
Signaling	27	1	12	4
Transport	30	0	17	0
Other	22	0	22	0
Total	29	0.3	18	0.4

The data has been normalized to 100% per protein group, based on pre-digestion data.