| IL-2 samples | % IL-2 Recovered at 37˚C | % IL-2 Recovered at 2˚C - 8˚C | % IL-2 Recovered at RT | |||||
| 0 Day | 1 Day | 2 Day | 3 Day | 5 Day | 30 Day | 30 Day | 30 Day | |
| IL-2 in 0.1 N acetic acid (pH 2.9) | 96 | 87 | 84 | 85 | 85 | 37 | 74 | 73 |
| IL-2 in PBS (pH 7.2) | 52 | 37 | 38 | 40 | 51 | 0 | 22 | 24 |
| IL-2 in PBS + 1 mg/mL EDTA | 74 | 65 | 68 | 77 | 66 | 39 | 55 | 31 |
| IL-2 in PBS + 5 mg/mL Met | 65 | 26 | 19 | 23 | 18 | 0 | 35 | 20 |
| IL-2 in PBS + 5 mg/mL His | 28 | 29 | 13 | 25 | 25 | 0 | 0 | 7 |
| IL-2 in PBS + 5 mg/mL Gly | 18 | 23 | 11 | 23 | 18 | 0 | 0 | 0 |
| Water |
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| IL-2 in water (pH ~7.0) | 68 | 51 | 44 | 42 | 27 | 6 | 38 | 13 |
| IL-2 in water + 1 mg/mL EDTA | 95 | 65 | 64 | 60 | 60 | 25 | 58 | 42 |
| IL-2 in water + 5 mg/mL Met | 93 | 81 | 71 | 71 | 77 | 0 | 62 | 46 |
| IL-2 in water + 5 mg/mL His | 79 | 81 | 63 | 55 | 33 | 0 | 67 | 13 |
| IL-2 in water + 5 mg/mL Gly | 82 | 74 | 64 | 53 | 49 | 0 | 52 | 0 |