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Abstract

The changes were discussed in the scavenging rate of ABTS free radicals of reduced pyrroloquinoline quinone (PQQH2) under different mass concentrations and different reaction time conditions. The primary and secondary reaction kinetic models were established. With conventional antioxidant vitamin C as a control, the scavenging performance of PQQH2 on ABTS free radicals was studied. Results: The higher of the concentration of PQQH2 and the longer the time were, the higher of the scavenging rate of ABTS free radicals was. After 25 minutes of reaction, the scavenging rate of 70 mg/L PQQH2 could reach more than 90%. The linear correlation coefficient fitted by the quasi-second-order kinetic model was 0.959~0.996, which was more in line with the scavenging characteristics of ABTS free radicals by PQQH2. The IC50 value of PQQH2 for scavenging ABTS free radicals was 90 μmol/L, which was 51.14% of vitamin C, when the holding time was constant, the loss of ABTS free radical scavenging ability of the same concentration of vitamin C was 2 to 3 times that of PQQH2. At a certain temperature, the loss of ABTS free radical scavenging ability of the same concentration of vitamin C was about 3 to 7 times that of PQQH2. In summary, PQQH2 has better antioxidant capacity than vitamin C.

Publication Date

5-28-2021

First Page

6

Last Page

9,46

DOI

10.13652/j.issn.1003-5788.2021.05.002

References

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