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458 Aitken and Learmonth<br />

Table 1<br />

Elution Order of Amino Acids and Derivatives<br />

from Ion-Exchange Amino Acid Analyzers<br />

1. O-Phosphoserine 24. S-Ethylcysteine<br />

2. O-Phosphothreonine 25. Glucosamine<br />

3. Cysteic acid 26. Mannosamine<br />

4. Urea 27. Galactosamine<br />

5. Glucosaminic acid 28. Valine<br />

6. Methionine sulphoxides 29. Cysteine<br />

7. Hydroxyproline 30. Methionine<br />

8. CM-Cysteine 31. α-Methylmethionine<br />

9. Aspartic acid 32. Isoleucine<br />

10. Methionine sulphone 33. Leucine<br />

11. α-Methyl aspartic acid 34. Norleucine<br />

12. Threonine 35. Tyrosine<br />

13. Serine 36. Phenylalanine<br />

14. Asparagine 37. Ammonia<br />

15. Glutamine 38. Hydroxylysine<br />

16. α-Methyl serine 39. Lysine<br />

17. Homoserine 40. 1-Methylhistidine<br />

18. Glutamic acid 41. Histidine<br />

19. α-Methyl glutamic acid 42. 3-Methylhistidine<br />

20. Proline 43. Tryptophan<br />

21. S-methylcysteine 44. Pyridylethyl-cysteine<br />

22. Glycine 45. Homocysteine thiolactone<br />

23. Alanine 46. Arginine<br />

The precise elution order may vary depending on the exact instrument and<br />

the precise temperature, molarity, and pH of buffers.

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