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Mol Nutr Food Res. 2016 Mar;60(3):652-60. doi: 10.1002/mnfr.201500633. Epub 2015 Dec 28.

Bioavailability and metabolism of benzyl glucosinolate in humans consuming Indian cress (Tropaeolum majus L.).

Author information

1
Hamburg School of Food Science, Institute of Food Chemistry, University of Hamburg, Hamburg, Germany.
2
Department of Clinical Nutrition, German Institute of Human Nutrition Potsdam-Rehbrücke, Nuthetal, Germany.
3
Department Plant Quality, Leibniz Institute of Vegetable and Ornamental Crops, Großbeeren/Erfurt e.V, Großbeeren, Germany.
4
Department of Endocrinology, Diabetes and Nutrition, Charité - Universitätsmedizin Berlin, Campus Benjamin Franklin, Berlin, Germany.

Abstract

SCOPE:

Benzyl isothiocyanate (BITC), which occurs in Brassicales, has demonstrated chemopreventive potency and cancer treatment properties in cell and animal studies. However, fate of BITC in human body is not comprehensively studied. Therefore, the present human intervention study investigates the metabolism of the glucosinolate (GSL) glucotropaeolin and its corresponding BITC metabolites. Analyzing BITC metabolites in plasma and urine should reveal insights about resorption, metabolism, and excretion.

METHODS AND RESULTS:

Fifteen healthy men were randomly recruited for a cross-over study and consumed 10 g freeze-dried Indian cress as a liquid preparation containing 1000 μmol glucotropaeolin. Blood and urine samples were taken at several time points and investigated by LC-ESI-MS/MS after sample preparation using SPE. Plasma contained high levels of BITC-glutathione (BITC-GSH), BITC-cysteinylglycine (BITC-CysGly), and BITC-N-acetyl-L-cysteine (BITC-NAC) 1-5 h after ingestion, with BITC-CysGly appearing as the main metabolite. Compared to human plasma, the main urinary metabolites were BITC-NAC and BITC-Cys, determined 4-6 h after ingestion.

CONCLUSION:

This study confirms that consumption of Indian cress increases the concentration of BITC metabolites in human plasma and urine. The outcome of this human intervention study supports clinical research dealing with GSL-containing innovative food products or pharmaceutical preparations.

KEYWORDS:

Benzyl isothiocyanate; Glucosinolates; Human intervention study; Male; Mercapturic acid pathway

PMID:
26610401
DOI:
10.1002/mnfr.201500633
[Indexed for MEDLINE]

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