Chem. J. Chinese Universities ›› 2026, Vol. 47 ›› Issue (3): 20250236.doi: 10.7503/cjcu20250236

• Articles: Inorganic Chemistry • Previous Articles     Next Articles

Inhibition Activity and Mechanism of Dawson-type Polyoxometalate-vitamin C Complexes against α -Glucosidase

HUANG Xinyi, QUE Maomei, LI Yao, LEI Shan, LIN Siqi, WANG Li()   

  1. College of Marine Food and Biological Engineering,Jimei University,Xiamen 361021,China
  • Received:2025-08-28 Online:2026-03-10 Published:2025-11-26
  • Contact: WANG Li E-mail:wanglimerry@jmu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22271119)

Abstract:

In this work, the inhibitory effects of Dawson-type polyoxometalates(POMs) complexed with vitamin C(VC) on α-glucosidase activity was investigated. Four Dawson-type phosphomolybdates were synthesized and characterized, including the parent compound H6[P2Mo18O62](P2Mo18) and three transition metal-substituted derivatives{H8[P2Mo17Fe(OH2)O61](P2Mo17Fe), H8[P2Mo17Co(OH2)O6(P2Mo17Co) and H8[P2Mo17Ni(OH2)O61(P2Mo17Ni)}. Enzyme kinetic studies revealed that all four POM-VC complexes exhibited significant inhibitory activity against α-glucosidase. The optimal inhibition ratios were determined to be 5∶1 for P2Mo18-VC, 3∶1 for P2Mo17Fe-VC and P2Mo17Ni-VC, and 2∶1 for P2Mo17Co-VC, with corresponding IC50 values of 0.194, 2.507, 2.809, and 5.332 mmol/L, respectively. Mechanistic studies demonstrated that these complexes functioned as reversible mixed-type inhibitors. These findings suggest the potential of Dawson-type POM-VC complexes as novel α-glucosidase inhibitors for diabetes management.

Key words: Polyoxometalates, α-Glucosidase, Vitamin C, Enzyme inhibition, Kinetic

CLC Number: 

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