Abstract
Among fruits and fruit products, oranges and orange juice are the most widely consumed worldwide. However, the effects of pest infestation of oranges on the quality of orange juice are not yet known. To evaluate the effect of the oriental fruit fly Bactrocera dorsalis on the antioxidant activity of orange juice, we measured changes in the vitamin C (Vc) concentration, total phenol content, and antioxidant activity of orange juice after the introduction of fruit fly eggs. Ten days after the eggs were introduced (larvae removed), the concentration of Vc in orange juice was 18.65 µg/mL, which was 9.16 µg/mL lower than that measured in healthy orange juice. In addition, the total phenol content decreased by 46.519 mg Gallic Acid Equivalents (GAE)/g to 9.748 mg GAE/g. Furthermore, the free-radical scavenging activity decreased from 22.297% to 5.393%. Correlation analysis indicated significant correlations between Vc concentration, total phenol content, and antioxidant activity of orange juice after B. dorsalis infestation. The decrease in Vc concentration, total phenol content and free-radical scavenging activity indicated that B. dorsalis changed the quality of orange juice by affecting the antioxidant activity of the juice after the oranges were infested.
Highlights
A large number of studies showed that the intake of fruits and vegetables is helpful to reduce the incidence of cardiovascular, cerebrovascular diseases and tumors, which are closely related to the antioxidant function of active substances in fruits (Silalahi, 2002; Kaul et al, 2007; Pandey and Rizvi, 2009)
To evaluate the effect of the oriental fruit fly Bactrocera dorsalis on the antioxidant activity of orange juice, we measured changes in the vitamin C (Vc) concentration, total phenol content, and antioxidant activity of orange juice after the introduction of fruit fly eggs
There was no visual change in the color of orange juice of three days inoculated fruit compared to the control, a greener color significant difference in the color of the orange juice three days after egg inoculation compared with the control, a greener color was observed after 10 days
Summary
A large number of studies showed that the intake of fruits and vegetables is helpful to reduce the incidence of cardiovascular, cerebrovascular diseases and tumors, which are closely related to the antioxidant function of active substances in fruits (Silalahi, 2002; Kaul et al, 2007; Pandey and Rizvi, 2009). Antioxidants have been confirmed to include phenolic metabolites, carotenoids and vitamin C (Vc) (Kaul et al, 2007). Citrus sinensis (Osbeck), juice is the most popular and widely consumed fruit juice in the world, accounting for approximately two-thirds of the total global sales of fruit juice because of its bright color, high nutrition and pleasant aroma. Orange juice is rich in Vc concentration, which is an important source of this vitamin in daily diets (Fry et al, 1999). Orange juice has antioxidant and macula protection functions
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