Journal
JOURNAL OF SEPARATION SCIENCE
Volume 41, Issue 24, Pages 4559-4566Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.201800972
Keywords
aqueous two-phase systems; globin peptide; high-speed countercurrent chromatography; MCI gel column chromatography; polypeptides
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Funding
- subtopics of the National Key R&D Program of China [2017YFF0207800]
- National Natural Science Foundation of China [21605149, 21505144]
- National Science and Technology Major Project [2017ZX09301045]
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Peptides have gained increased interest over the past several decades because of their therapeutics. In this research, a strategy combining MCI gel column chromatography and high-speed countercurrent chromatography was developed for the separation of high-purity peptide Val-Val-Tyr-Pro from Globin Peptide. First, the fraction of Val-Val-Tyr-Pro mixtures with a purity of 15.8% was obtained by using MCI gel column with a mixture of ethanol/water (20: 80, v/v/v). Then, the high-purity Val-Val-Tyr-Pro was separated by high-speed countercurrent chromatography with a aqueous two phase systems of ethanol/acetonitrile/iso-propyl alcohol/(NH4)(2)SO4Saturated solution/H2O (0.5:0.5:0.25:1.5:0.7, v/v). The ammonium sulfate from high-speed countercurrent chromatography fractions was removed from target compound by MCI gel column chromatography using ethanol/water in stepwise elution mode. A 78 mg of Val-Val-Tyr-Pro was successfully purified with the purities of 98.80% from 30 g crude Globin Peptide. The amino acid sequence of the Val-Val-Tyr-Pro was determined by electrospray ionization high resolution tandem mass spectrometry. The method presents a practical strategy for the large-scale separation of pure peptide Val-Val-Tyr-Pro from Globin Peptide, and provides a reference method for obtaining high-purity peptide from other polypeptide mixtures.
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