Research: MUZOLF-PANEK and COLLEAGUES

Listed in Issue 265

Abstract

MUZOLF-PANEK and COLLEAGUES,1. a Department of Food Quality Management , Poznań University of Life Sciences , Poznan , Poland; 2. b Department of Plant Nutrition , Poznań University of Life Sciences , Poznan , Poland evaluated the effect of increasing manganese (Mn) nutrition on the content of antioxidative compounds such as vitamin C, lycopene and polyphenols, and the antioxidant activity of tomato fruit.

Background

This study evaluated the effect of increasing manganese (Mn) nutrition on the content of antioxidative compounds such as vitamin C, lycopene and polyphenols, and the antioxidant activity of tomato (Lycopersicon esculentum Mill., cvs 'Alboney F1' and 'Emotion F1') fruit.

Methodology

Plants were grown in rockwool using a nutrient solution with the following content of Mn (mg dm-3): 0.0, 0.3, 0.6, 1.2, 2.4, 4.8, 9.6 and 19.2.

Results

The level of vitamin C and lycopene decreased with the increasing Mn nutrition. Since the colour of fruits was correlated with the change in carotenoid content, the decrease in lycopene content promoted the reduction of redness and increase of yellowness of fruits. However, total polyphenol content and antioxidant activity significantly increased when plant were exposed to toxic levels of Mn. Observed changes could be the result of the oxidative stress induced by high concentrations of Mn.

Conclusion

Polyphenolic compounds play a crucial role in the plant's response to Mn stress and affect predominantly the total antioxidant properties of fruits, which could be used as a source of phenolics. Moreover, total phenolic content measurement, as an easy and inexpensive method, could be used as an indicator of Mn-induced stress in fruits of tomato.

References

Muzolf-Panek M1, Kleiber T2, Kaczmarek A1. Effect of increasing manganese concentration in nutrient solution on the antioxidant activity, vitamin C, lycopene and polyphenol contents of tomato fruit. Food Addit Contam Part A Chem Anal Control Expo Risk Assess.;34(3):379-389. Mar 2017 doi: 10.1080/19440049.2016.1277037. Epub Jan 26 2017. Erratum in

Erratum. [Food Addit Contam Part A Chem Anal Control Expo Risk Assess. 2017]

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