The application of microelectrodes in the study of antioxidants in edible oil.

Introduction: Oil as one of the three major nutrients of human beings, is an important part of the human diet, oil in the production, storage, transport to consumption of the whole process, due to impurities, water, temperature, humidity and light and other external conditions, will occur a series of complex chemical changes, the resulting aldehyde, ketone and other substances.
the oxidation of the oil, not only make it taste worse, but also will cause damage to membranes, enzymes, proteins, and even lead to many diseases of aging, may also cause cancer, serious harm to human health.
oil as one of the main raw materials of people's essential food and food industry, its oxidation stability directly affects the quality of oil, and the quality of oil and food quality is closely related to people's health and food quality, research and development of oil oxidation steady state technology, to ensure the safety of edible oil consumption and people's physical and mental health is of great significance.
the way to avoid oil oxidation is generally by adding antioxidants to the oil, such as the chemical synthesis of butyl hydroxyl fentanyl ether (BHA) and duobutanine hydroxyl toluene (BHT) to extend its shelf life and quality stability, but the human intake of large amounts of BHA and BHT will lead to the occurrence of malformations and cancer, more and more countries have stopped or strictly restricted the use of synthetic antioxidants.
tea polyphenols are an all-natural compound extracted from green tea.
tea polyphenols are composed of the following four categories: catechins, flavonoids and flavonols, anthocyanins and anthocyanins, phenolic acids.
tea polyphenols have strong antioxidant effect, its antioxidant capacity is 4-6 times that of synthetic antioxidants BHT and BHA.
adding tea polyphenols to edible oil can prevent and delay the automatic oxidation and decomposition of unsaturated fatty acids, thus preventing the quality of oil and more than doubling the shelf life of the oil.
a large number of studies have shown that alpha-copin, catechins, table catechins, green tea extract has good antioxidant properties in the solution applied to homogenous and non-homogenous, where in combination alpha-procopiditol and green tea extract are used in edible oiland emulsion-type oils showed good synergistic antioxidant properties.
and combining alpha-colostlitin, catechins, and table catechins have synergistic antioxidant properties for lipids and water-encased emulsion systems.
the antioxidant properties of catechins and table catechins as antioxidants.
in contrasting the performance of antioxidants used in edible oils, using in-place tests of dissolved oxygen concentrations in edible oil samples, using a tip 100 micron diameter oxygen microelectrode developed by unisense denmark to test the concentration of dissolved oxygen in edible oils with different antioxidants, and to determine the antioxidant properties of antioxidants in edible oils by comparing changes in oxygen consumption and reduced oxygen consumption in edible oil. there are many test methods for
antioxidant properties, but most of the test methods are indirect measurements, such as chemical methods, is the determination of the first oxidizing of grease or peroxide, such methods are indirect, there is a certain error.
and the use of physical methods is the use of gas chromatography to directly test peroxides, the operation process is more complex, there is sampling and experimental operation process of trouble, by using oxygen microelectrodes to test dissolved oxygen in edible oil is a direct method, to avoid the shortcomings of these methods, can quickly help test workers to quickly test the antioxidant properties.
the oxygen microelectrode developed by Unisense, Denmark, is a high-performance oxygen measurement tool.
its oxygen microelectrode tip up to 2-3 microns, can measure high spatial accuracy oxygen concentration and distribution without destroying the sample under test, and has the advantage of testing the sample speed (response time of 0.3 seconds).
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