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Bioavailability and metabolism of fucoxanthin in rats: structural characterization of metabolites by LC-MS (APCI)

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Abstract

This study reports bioavailability and metabolism of fucoxanthin (FUCO) from brown algae Padina tetrastromatica in rats. Rats were divided into two groups (n = 25/group). Group one was fed basal diet (control) while the group two received retinol deficient diet (RD group) for 8 weeks. After confirmed RD in blood (0.53 μmol/l), rats were further sub-grouped (n = 5/sub group), intubated a dose of FUCO (0.83 μmol) and killed after 0, 2, 4, 6 and 8 h. The plasma levels (area under curve/8 h) of FUCO (fucoxanthinol (FUOH) + amarouciaxanthin (AAx)) was 2.93 (RD group) and 2.74 pmol/dl (control), respectively. No newly formed retinol was detected in RD rats intubated with FUCO. Besides FUOH (m/z 617 (M+H)+) and AAx (m/z 617 (M+H−)+), other deacetylated, hydrolyzed and demethylated metabolites of bearing molecular mass at m/z 600.6 (FUOH–H2O), m/z 597 (AAx–H2O), m/z 579 (AAx–2H2O+1), m/z 551 (AAx–2H2O–2CH3+2) and m/z 523 (AAx–2H2O–4CH3+4) were also detected in plasma and liver by LC-MS (APCI). Although biological functions of FUCO metabolites need thorough investigation, this is the first detailed report on FUCO metabolites in rats.

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Acknowledgements

This work was partially supported by the Department of Biotechnology, Govt. of India, New Delhi. The first author acknowledges the University Grant Commission, Govt. of India, New Delhi, for awarding Senior Research Fellowship. Authors acknowledge the help of Ms. Asha M and Mr. Mukund PL in chromatographic and mass spectrometric analyses.

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Authors and Affiliations

  1. Department of Biochemistry and Nutrition, Central Food Technological Research Institute, CSIR, Mysore, 570 020, India

    Ravi Kumar Sangeetha & Vallikannan Baskaran

  2. Department of Meat, Fish and Poultry Technology, Central Food Technological Research Institute, CSIR, Mysore, 570 020, India

    Narayan Bhaskar

  3. Department of Fermentation Technology and Bioengineering, Central Food Technological Research Institute, CSIR, Mysore, 570 020, India

    Sounder Divakar

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  1. Ravi Kumar Sangeetha
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  2. Narayan Bhaskar
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  4. Vallikannan Baskaran
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Correspondence to Vallikannan Baskaran.

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Sangeetha, R.K., Bhaskar, N., Divakar, S. et al. Bioavailability and metabolism of fucoxanthin in rats: structural characterization of metabolites by LC-MS (APCI). Mol Cell Biochem 333, 299–310 (2010). https://doi.org/10.1007/s11010-009-0231-1

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