Table 2.

LC-ESI-MS/MS SRM determination of IGF-1 in different milk samples. Total protein content (mg/mL) and IGF-1 concentration ± standard deviation (±SD) (ng/mL) are reported for the investigated milk samples.

Sample	Milk Types	Milk Brand	Total protein content (mg/mL)	IGF-1 concentration (±SD) (ng/mL)
1	Fresh whole	Conad	10.6	346 ± 5*
2		Esselunga	32.1	29.2 ± 0.9
3		Granarolo	25.8	34.6 ± 0.5
4		Granarolo	21.1	26.7 ± 0.3
5	UHT whole	Coop	17.4	91.4 ± 0.4
6		Esselunga	23.4	11.1 ± 0.4**
7		Parmalat	21.7	23.9 ± 0.8
8	Fresh semi-skimmed	Conad	24.4	89 ± 6
9		Granarolo	23.6	68.8 ± 0.8
10	UHT semi-skimmed	Coop	19.3	153 ± 5
11		Granarolo	23.5	57.2 ± 0.4
12		Parmalat	37.9	17.7 ± 0.6
13		Esselunga	29.7	20.4 ± 0.9
14	Fresh whole microfiltered	Conad	30.3	121 ± 7
15		Esselunga	27.3	54.8 ± 0.4
16	Fresh semi-skimmed microfiltered	Conad	29.2	87 ± 2
17		Esselunga	27.4	124 ± 3
18		Parmalat	24.0	27.5 ± 0.9
19	UHT skimmed	Coop	18.5	166 ± 7
20		Esselunga	23.6	74 ± 2
21	UHT semi-skimmed microfiltered	Coop	20.5	147 ± 4
22	UHT lactose free	Parmalat	28.8	29.7 ± 0.8
23	UHT lactose free low-fat	Parmalat	27.8	17.8 ± 0.2
24		Granarolo	31.2	11.7 ± 0.4**
25	UHT low-fat	Granarolo	22.9	61.8 ± 0.5

*Highest IGF-1 concentration. ** Lowest IGF-1 concentration.