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The Effects of Antioxidant Activity in Gamma-Irradiated Navel orange

Published online by Cambridge University Press:  30 August 2013

Y. J. Cho ,
K. H. Kim  and
H. S. Yook
Y. J. Cho
Affiliation:
Dept. of Food and Nutrition, Chungnam National University, Daejeon 305–764, Korea
K. H. Kim
Affiliation:
Dept. of Food and Nutrition, Chungnam National University, Daejeon 305–764, Korea
H. S. Yook
Affiliation:
Dept. of Food and Nutrition, Chungnam National University, Daejeon 305–764, Korea
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Abstract

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Proceedings of the Nutrition Society , Volume 72 , Issue OCE4: Summer Meeting, 15–18 July 2013, Nutrition and healthy ageing , 2013 , E231
Copyright
Copyright © The Authors 2013 

Gamma irradiation on the food materials has been used in the food industry for the preservation and the sanitation. This study investigated the effects of gamma irradiation of ‘Navel’ oranges. We especially investigated changes in the Antioxidant Activity of gamma irradiated ‘Navel’ oranges.

The samples were irradiated at doses of 0, 0.4, 0.6, 0.8, 1 and 1.5 kGy. To identify the effects of antioxidant activity in gamma-irradiated Navel orange, total phenolic content, DPPH radical scavenging activity, ABTS scavenging activity, FRAP and Cu2+ activity, reducing power were investigated.

Fig. A, Fig. B, Fig. C, Fig. D. The Effects of Antioxidant Activity in Gamma-Irradiated Orange.

Fig. A shows that the total phenolic contents of gamma irradiated samples were generally low compare to the control. 1 kGy irradiated sample demonstratred the highest measure and it was similar in total phenolic contents to that of control. Irradiated samples had lower DPPH radical scavenging activity than the control(p<0.05), with the sample irradiated at 1.5 kGy having the highest of all irradiated samples which was also similar to that of the control. (Fig. B) Fig. C represents ABTS radical scavenging activity of the samples; 1 kGy irradiated sample was the highest sample. The samples had no significant results in FRAP and Cu2+ activity between one another, but a sample irradiated at 1 kGy had the most similar activity as with that of control. We found correlativity between reducing power and the dose of the samples; at the same irradiation dosage, reducing power was proportional to the doses of the samples. (Fig. D)

In summary, our data indicate that irradiating Navel oranges at 1 kGy does not negatively impact them as indicated; because it has the similarities of antioxidant activity with the control.

This research was supported by Export Promotion Technology Development Program, Ministry for Food, Agriculture, Forestry and Fisheries, Republic of Korea.

References

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Fig. A, Fig. B, Fig. C, Fig. D. The Effects of Antioxidant Activity in Gamma-Irradiated Orange.