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Determination of lactose in milk products: a comparison of three-enzyme amperometric biosensor and gas chromatography/tandem mass spectrometry

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Abstract

Two completely different analytical methods for lactose determination are presented. Three-enzyme biosensor involving β-galactosidase, glucose oxidase, and horseradish peroxidase was constructed with successive steps of optimization. Primary experiments were carried out with horseradish peroxidase biosensor in solution of hydrogen peroxide. Addition of poly(ethylene glycol) diglycidyl ether was examined and the best constant potential for chronoamperometric experiments was selected at −0.05 V using cyclic voltammetry. Ferrocene was chosen as the best from three tested mediators and optimum concentration of ferrocene was found out at 2 g dm−3. Two electrode materials were compared. Spectroscopic graphite electrode proved better electrochemical response for its twice larger electro-active surface than screen-printed carbon electrode. Phosphate buffer solution of pH 7.5, at which the three-enzyme system provided the highest current signal, was used for lactose determination in milk, milk powder, curd cheese, and yogurt. Gas chromatography with tandem mass spectrometric detection was used for determination of lactose, glucose, and galactose in the real samples with internal standard salicine using single ion monitoring mode. Determined content of lactose in the milk products was compared with declared values. Gas chromatography with tandem mass spectrometric detection offers higher sensitivity and orthogonal selectivity in comparison to enzyme biosensor.

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Acknowledgements

This work was supported by the Ministry of Education, Youth and Sports of the Czech Republic (Projects LO1305 and CZ.1.05/2.1.00/19.0377) and by Palacký University in Olomouc (Project IGA_PrF_2016_016).

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Authors and Affiliations

  1. Regional Centre of Advanced Technologies and Materials, Department of Analytical Chemistry, Faculty of Science, Palacký University, 17. listopadu 12, 771 46, Olomouc, Czech Republic

    Pavla Kučerová, Petra Komenská, Hana Tomková, Jana Skopalová & Petr Barták

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  1. Pavla Kučerová
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  2. Petra Komenská
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  3. Hana Tomková
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  4. Jana Skopalová
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  5. Petr Barták
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Correspondence to Pavla Kučerová.

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Kučerová, P., Komenská, P., Tomková, H. et al. Determination of lactose in milk products: a comparison of three-enzyme amperometric biosensor and gas chromatography/tandem mass spectrometry. Monatsh Chem 148, 517–524 (2017). https://doi.org/10.1007/s00706-016-1903-7

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  • DOI: https://doi.org/10.1007/s00706-016-1903-7

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