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No effect of the farming system (organic/conventional) on the bioavailability of apple (Malus domestica Bork., cultivar Golden Delicious) polyphenols in healthy men: a comparative study

Stracke, Berenike A.; Rüfer, Corinna E.; Bub, Achim; Seifert, Stephanie; Weibel, Franco; Kunz, Clemens and Watzl, Bernhard (2010) No effect of the farming system (organic/conventional) on the bioavailability of apple (Malus domestica Bork., cultivar Golden Delicious) polyphenols in healthy men: a comparative study. European Journal of Nutrition, 49 (5), pp. 301-310.

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Summary

Background
The organic food sales have been increasing during the recent years. It has been hypothesised that organically grown fruits are healthier based on their higher content of phytochemicals. However, data on the bioavailability of phytochemicals from organically or conventionally produced plant foods are scarce.
Methods
Two human intervention studies were performed to compare the bioavailability of polyphenols in healthy men after ingestion of apples from different farming systems. The administered apples were grown organically and conventionally under defined conditions and characterised regarding their polyphenol content and antioxidant capacity. No significant differences in the polyphenol content and the antioxidant capacity from the organic and conventional farming system were observed.
Results
In the short-term intervention study, six men consumed either organically or conventionally produced apples in a randomized cross-over study. After intake of 1 kg apples, phloretin (C max 13 ± 5 nmol/l, t max 1.7 ± 1.2 h) and coumaric acid (C max 35 ± 12 nmol/l, t max 3.0 ± 0.8 h) plasma concentrations increased significantly (P < 0.0001) in both intervention groups, without differences between the two farming systems. In the long-term intervention study, 43 healthy volunteers consumed organically or conventionally produced apples (500 g/day; 4 weeks) or no apples in a double-blind, randomized intervention study. In this study, 24 h after the last dosing regime, the apple intake did not result in increasing polyphenol concentrations in plasma and urine compared to the control group suggesting no accumulation of apple polyphenols or degradation products in humans.
Conclusion
Our study suggests that the two farming systems (organic/conventional) do not result in differences in the bioavailability of apple polyphenols.


EPrint Type:Journal paper
Keywords:Apples, Bioavailability, Organic, Polyphenols, Antioxidant status, Human intervention study, Anbautechnik Pflanzenbau, Bioobstbau, Innere Qualität
Subjects: Food systems > Food security, food quality and human health
Crop husbandry > Production systems > Fruit and berries
Research affiliation: Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Crop Production > Fruit Production
Germany > Federal Research Institute of Nutrition and Food - MRI > Department of Physiology and Biochemistry of Nutrition
ISSN:1436-6207 (Print) 1436-6215 (Online)
DOI:DOI: 10.1007/s00394-009-0088-9
Related Links:http://www.researchgate.net/publication/40768890_No_effect_of_the_farming_system_(organicconventional)_on_the_bioavailability_of_apple_(Malus_domestica_Bork._cultivar_Golden_Delicious)_polyphenols_in_healthy_men_a_comparative_study, http://www.fibl.org/de/schweiz/forschung/anbautechnik-pflanzenbau.html
Deposited By: Weibel, Franco
ID Code:17951
Deposited On:10 Nov 2010 11:54
Last Modified:10 Nov 2010 11:55
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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