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Type of publication: conference paper
Type of publication (PDB): Tezės kituose recenzuojamuose leidiniuose / Theses in other peer-reviewed publications (T1e)
Field of Science: Biologija / Biology (N010)
Author(s): Drevinskas, Tomas;Stankevičius, Mantas;Armonavičius, Domantas;Bimbiraitė-Survilienė, Kristina;Naujokaitytė, Gintarė;Kaškonienė, Vilma;Kondrotienė, Kristina;Šernienė, Loreta;Kornyšova, Olga;Malakauskas, Mindaugas;Maruška, Audrius Sigitas
Title: Application of capillary electrophoresis with contactless conductivity detector for determination of nisin in fermented milk product
Is part of: ITP 2017: Electro-and liquid phase-separation techniques: 24th international symposium, 10-13 September, 2017 Sopot/Gdansk, Poland: abstract book. Gdansk : Gdanski Uniwersytet Medyczny, 2017
Extent: p. 246-246
Date: 2017
Note: The study was funded by the Research Council of Lithuania (BIOLACTIS, Grant No. MIP-063/2015)
Keywords: Cultured milk products;Nisin;Electrophoresis, capillary
Abstract: The demand for natural antibacterial agents is growing all over the world. Nisin is the only antibacterial peptide which is allowed for conservation of some products and is recognized as food additive (E234). Nisin may be added into food not only as pure agent, but also may be produced in food media by bacteriocins (nisin) producing lactic cid bacteria. Therefore, the analysis of nisin in food matrix is an important task. The aim of this study was to apply capillary zone electrophoresis coupled with 2nd generation capacitance-to-digital technique based contactless conductivity detector for the separation and determination of nisin in fermented milk products. Sample preparation included following steps: (i) extraction/dilution and (ii) centrifugation. Capillary electrophoresis of samples was performed in 0.5 M (pH 2.53) acetic acid background electrolyte, using 13kV voltage and hydrodynamic injection at 50 mbar*40s. Determination of natural preservatives in fermented milk products is a complkex task due to following reasons: (i) concentrations below detection limit, (ii) complex matrix and interfering compounds, (iii) low recovery, and (iv) complex sample preparation needed. Capillary electrophoresis with contactless conductivity method was optimized for the separation of nisin in fermented milk and fresh cheese samples. The precision, accuracy and sensitivity of the method were determined. Optimized conditions allowed precise, accurate, sensitive (limit of detection: 0.19 ng/ml) and most importantly - requiring very simple sample preparation, determination of nisin. Simple, precise, accurate and robust capillary zone electrophoresisi - contactless conductivity detection analysis procedure developed allowing determination of nisin in fermented milk products
Affiliation(s): Biochemijos katedra
Gamtos mokslų fakultetas
Instrumentinės analizės APC
Lietuvos sveikatos mokslų universitetas. Veterinarijos akademija
Vytauto Didžiojo universitetas
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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