Table 2.
Label claim contents and detected contents of A1 and A2 β-casein in pasteurized milk by online digestion and in-solution digestion coupled to HPLC-MS/MS analysis
| Sample | Country | Label claim (β-casein, g/100 mL) | Detected content (g/100 mL) | ||||
|---|---|---|---|---|---|---|---|
| Online digestion | In-solution digestion | ||||||
| A2 | A1 | A2 | A1 | ||||
|
A2 pasteurized milk |
S-1 | Australia | 0.9 | 0.81 | / | 0.84 | / |
| S-2 | New Zealand | 0.9 | 0.83 | / | 0.87 | / | |
| S-3 | China | 0.9 | 0.86 | / | 0.91 | / | |
| S-4 | Australia | 1.0 | 0.93 | / | 1.01 | / | |
| S-5 | China | 0.9 | 1.03 | / | 1.08 | / | |
| Ordinary pasteurized milk | S-6 | New Zealand | / | 0.57 | 0.39 | 0.61 | 0.40 |
| S-7 | China | / | 0.55 | 0.37 | 0.58 | 0.39 | |