The Stability of Glucosamine-?-Aminoacids-Nickel(Ⅱ) Ternary Complexes / 中国药房

ABSTRACT

OBJECTIVE: To studies on the stability of glucosamine-?-aminoacids-nickel(Ⅱ) ternary complexes(GANTC). METHODS: The formation constant of GANTC were determined at (25?0.1) ℃,I=0.1 mol?L-1 KNO3 by pH method. RESULTS: The formation constant of GANTC were Gly 13.73(7.33),Pro 13.97(7.12),Ser 13.15(7.07),Val 13.46(6.84),iLe 13.55(6.88),Phe 13.13(6.93) and Met 13.17(7.18). CONCLUSIONS: The two biologically active ligand,?-aminoacid and glucosamine accommodate each other when coordinated to nickel(Ⅱ) ion. The formation constant of the ternary complexes linearly increase with the increase of protonation constant of aminoacid. Linear free energy relationship does exist in the presence of ternary system.