Thymosin α1 was synthesized manually. The washing condition and the test of the degree of coupling were studied. In addition
the analytical method of crude product was set up. Thymosin α1 was synthesized with the solid-phase method
by using the base-liable Fmoc group to protect the α-amino acid and N
N′-diisopropylcarbodiimide (DIC) as the coupling regent. The crude product was analyzed by reversed-phase high performance liquid chromatography
SDS-PAGE and liquid chromatography/mass spectroscopy.The synthesis yield was 84.89%. The analytical results indicated that the crude product contained much thymosin α1
and the purity was 50.3%. DIC solid-phase chemical synthesis of thymosin α1 was applicable
and the yield was improved greatly compared to other known methods.