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Vitamin B6 and its metabolite reveal radical scavenging activity at basic pH

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Gliszczynska-Swiglo A., Szymusiak H.

Polish Journal of Food and Nutrition Sciences

2007

tom 57

nr 4[A]

163-167

In the present study, the pH-dependent radical-scavenging activities, in the TEAC (Trolox equivalent antioxidant capacity) assay, of pyridoxine (PN), pyridoxal (PL), pyridoxamine (PM) (vitamin B6 forms) and their main metabolite 4-pyridoxic acid (PA) was determined. For all compounds, the increase in the TEAC values with increasing pH of the medium from value 7 to 9 was observed. The order of radical-scavenging activity was found as follows: PN>PM>PL>PA and it was confirmed by their oxidative potentials measured using cyclic and square-wave voltammetry. Quantitative relationship between experimental radical-scavenging activity and calculated bond dissociation energy values (BDE) was found suggesting hydrogen atom donation as the main mechanism of radical-scavenging activity of vitamin B6 and PA. The results of the present study suggest that vitamin B6 may contribute to the total antioxidant capacity of antioxidants present in human body especially at basic conditions.

Ograniczanie wyników

1 Polish Journal of Food and Nutrition Sciences

1 Gliszczynska-Swiglo A.

1 Szymusiak H.

1 2007

Wyniki wyszukiwania

Vitamin B6 and its metabolite reveal radical scavenging activity at basic pH