Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz
Gewählte Publikation:
Schoemaker, M; Feldbrügge, R; Gründig, B; Spener, F.
The lipoxygenase sensor, a new approach in essential fatty acid determination in foods.
Biosens Bioelectron. 1997; 12(11):1089-1099
Doi: 10.1016/S0956-5663(97)00073-0
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- Führende Autor*innen der Med Uni Graz
- Spener Friedrich
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- Abstract:
- Both an enzyme electrode and enzyme column with immobilized lipoxygenase, respectively, were used for the determination of essential fatty acids. The former was applied in a batch system, the latter was part of a fully automated flow injection analysis (FIA)-system. The oxygen consumption due to the lipoxygenase catalysed oxygenation of essential fatty acids was monitored amperometrically. Both systems were compared with regard to linear ranges of the calibration plots, sensitivities, detection limits, apparent Michaelis-Menten constants and lifetimes. The enzyme electrode showed different sensitivities for linoleic and alpha-linolenic acids, the most common essential fatty acids. The reason for this was not a second oxygenation step by lipoxygenase in case of alpha-linolenic acid, but a different dialytic behaviour of the two substrates. Hence, only the FIA-system was used for the determination of these fatty acids in real matrices such as vegetable oils and margarines. In the presence of detergent the triglycerides of the hydrophobic food samples were converted into water soluble glycerol and free fatty acids by a 15 min incubation with a ready to use lipase/esterase-mix, thus avoiding the use of organic solvents for analysis. Results obtained by the enzymatic FIA-system were in excellent agreement with those obtained by standard gas chromatography.
- Find related publications in this database (using NLM MeSH Indexing)
- Biosensing Techniques -
- Dialysis -
- Fatty Acids, Essential - analysis
- Flow Injection Analysis -
- Food Analysis - methods
- Hydrogen-Ion Concentration -
- Isoenzymes -
- Lipoxygenase -
- Sensitivity and Specificity -
- Soybeans - enzymology
- Find related publications in this database (Keywords)
- flow injection analysis (FIA)-system
- amperometric enzyme sensor
- oxygen electrode
- lipoxygenase
- essential fatty acids
- lipolysis
- vegetable oils
- margarines