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Bioavailability and nutritional effects of carotenoids from organically and conventionally produced carrots in healthy men

Stracke, B.A.; Rüfer, C.E.; Bub, A.; Briviba, K.; Seifert, S.; Kunz, C. and Watzl, B. (2008) Bioavailability and nutritional effects of carotenoids from organically and conventionally produced carrots in healthy men. Br J Nutr. (20), pp. 1-9.

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Summary

It has been hypothesised that organically grown vegetables are healthier than conventionally produced ones due to a higher content of phytochemicals. However, few data from controlled human studies exist. The aim of the present study was to compare the carotenoid content and antioxidant capacity of organically and conventionally produced carrots under defined conditions. Furthermore, a human intervention study was conducted to compare bioavailability, plasma antioxidant capacity, endogenous DNA strand breaks and immune parameters in healthy men ingesting carrots from different agricultural systems. Thirty-six volunteers consumed either organically or conventionally produced blanched carrots (200 g/d; 2 weeks) or no carrots in a double-blind, randomised intervention study. No statistically significant differences were observed in the total carotenoid contents (121 (sd 7) mug/g organic v. 116 (sd 13) mug/g conventional) and the antioxidant capacities (0.43 (sd 0.08) mumol Trolox equivalents/g organic v. 0.32 (sd 0.07) mumol Trolox equivalents/g conventional) of the carrots administered to the volunteers. Intake of organically or conventionally produced carrots significantly increased (P < 0.001) plasma alpha- and beta-carotene concentrations in both intervention groups without differences in plasma carotenoid concentrations. Consumption of carrots did not lead to significant changes in the plasma antioxidant status, endogenous DNA strand breaks and parameters of the immune system in all groups. Therefore, these results indicate that the agricultural system has neither an effect on the carotenoid content, the antioxidant capacity of carrots, nor on the bioavailability of carotenoids and on antioxidant, antigenotoxic and immunological effects as assessed in a human intervention study.
PMID: 19021920 [PubMed - as supplied by publisher]


EPrint Type:Journal paper
Keywords:BÖL, BOEL, FKZ 04OE027, content of phytochemicals, carotenoid content, antioxidant capacity, carrots, bioavailability, plasma antioxidant capacity, endogenous DNA strand breaks, immune parameters
Subjects: Food systems > Food security, food quality and human health
Research affiliation: Germany > Federal Research Institute of Nutrition and Food - MRI > Department of Physiology and Biochemistry of Nutrition
Germany > Federal Organic Farming Scheme - BOELN > Food > Quality
Related Links:http://www.bundesprogramm-oekolandbau.de, http://www.bundesprogramm.de/fkz=04OE027, http://orgprints.org/perl/search/advanced?addtitle%2Ftitle=&keywords=04OE027&projects=BOEL&_order=bypublication&_action_search=Suchen
Deposited By: Watzl, PD Dr. Bernhard
ID Code:15250
Deposited On:27 Jan 2009
Last Modified:12 Apr 2010 07:38
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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