Higher antioxidant and lower cadmium concentrations and lower incidence of pesticide residues in organically grown crops: A systematic literature review and meta-analyses

British Journal Of Nutrition (Impact Factor: 3.45). 06/2014; 112(05):1-18. DOI: 10.1017/S0007114514001366
Source: PubMed


Demand for organic foods is partially driven by consumers' perceptions that they are more nutritious. However, scientific opinion is divided on whether there are significant nutritional differences between organic and non-organic foods, and two recent reviews have concluded that there are no differences. In the present study, we carried out meta-analyses based on 343 peer-reviewed publications that indicate statistically significant and meaningful differences in composition between organic and non-organic crops/crop-based foods. Most importantly, the concentrations of a range of antioxidants such as polyphenolics were found to be substantially higher in organic crops/crop-based foods, with those of phenolic acids, flavanones, stilbenes, flavones, flavonols and anthocyanins being an estimated 19 (95 % CI 5, 33) %, 69 (95 % CI 13, 125) %, 28 (95 % CI 12, 44) %, 26 (95 % CI 3, 48) %, 50 (95 % CI 28, 72) % and 51 (95 % CI 17, 86) % higher, respectively. Many of these compounds have previously been linked to a reduced risk of chronic diseases, including CVD and neurodegenerative diseases and certain cancers, in dietary intervention and epidemiological studies. Additionally, the frequency of occurrence of pesticide residues was found to be four times higher in conventional crops, which also contained significantly higher concentrations of the toxic metal Cd. Significant differences were also detected for some other (e.g. minerals and vitamins) compounds. There is evidence that higher antioxidant concentrations and lower Cd concentrations are linked to specific agronomic practices (e.g. non-use of mineral N and P fertilisers, respectively) prescribed in organic farming systems. In conclusion, organic crops, on average, have higher concentrations of antioxidants, lower concentrations of Cd and a lower incidence of pesticide residues than the non-organic comparators across regions and production seasons.

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    • "Those compounds are found in the pericarp, seed, bark, leaves, roots and flesh of the mangosteen. Besides xanthone, there are anthocyanin, folic acid and tannins, as well as various nutrients with antioxidant capacity of 84,6 to 86,3%, or 0.8 times higher than ascorbic acid thus it is called superantioxidant [18]. The mangosteen pericarp has a wide range of benefits such as antioxidant and antiinflammatory . "
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    ABSTRACT: Background. Garcinia mangostana L(GML) pericarp extract is known to contain active substances called Xanthones (α, β and γ Mangosteens) which is the biggest derivative and has strong antioxidant effects. This substance also has antiinflammatory, antilipid, anticancer, antibacteria and antituberculosis effects. However, its mechanism is still unclear. Mycobacterium tuberculosis (M. tuberculosis) invasion into the lungs through the respiratory tract can cause severe infection. The body has an immune system which controls infection by eliminating germs to ease the burden of infection. Interferon gamma (IFN-γ) and Interleukin 12 (IL-12) acts as positive feedback in stimulating macrophages to kill M. tuberculosis. During this process, oxidative compounds (ROI,RNI,NO) that plays an important role in the phagolysosome fusion process are produced. Not only does the consumption of GML pericarp extract as an antioxidant becomes the immunomodulator to enhance the immune's activities, it also functions as an antioxidant that can neutralize the oxidative compounds produced by the immune system. The aim of this study was to determine the effect of EPEBh GML on IFN-γ and IL-12 secretion activities in mice infected with M. tuberculosis. Materials and method. This study used 30 Wistar rats, 150-200g of weight and 8-10 weeks old. Rats were randomly divided into 6 groups each consisting of 5 rats, including the negative control (without infection and without EPEKBh GML intervention) and a positive control (rats were infected with M.tb H37Rv at a dose of 10 6 cfuas much as 0.2 ml through the trachea for 6 weeks). Once infected, the rats were then intervened with EPEKBhGML 30, 60, 120 dose and 180 mg/kg bodyweigh/day for 1 month. Afterward the rats were necropsied and dissected for the blood to be taken directly from the heart. Levels of IFN-γ and IL-12 were analyzed using the ELISA method. Data were then analyzed using One-Way ANOVAtest followed by Post-Hoc test (LSD), a significant P <0.05, to assess the comparison between groups. Results. Results show that EPEKBh GML significantly affect the rise of IFN-γ levels, with a P value 0,000<0,05 and IL-12, with a P value of 0,045 <0,05. Conclusion. EPEKBh GML was effective in increasing the activity of IFN-γ and IL-12 and the most effective dose to increase IFN-γ and IL-12activity was 120 mg/kgbody weight/day. Also, increasing the dose to a higher dosage had no effect on IFN-γ and IL-12 activity, in fact it tended to decline.This results need to further study to understand what the reason.
    01/2015; 3(3 1):8-13. DOI:10.12691/ajmr-3-1-2
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    British Journal Of Nutrition 09/2014; 112(10):1-3. DOI:10.1017/S0007114514002645 · 3.45 Impact Factor
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    British Journal Of Nutrition 09/2014; 112(10):1-3. DOI:10.1017/S0007114514002748 · 3.45 Impact Factor
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