Oil oxidation is an undesirable series of chemical reactions
involving oxygen that degrades the quality of an oil. Oxidation
eventually produces rancidity in oil, with accompanying off
flavours and smells. All oil is in a state of oxidation - you cannot
stop it completely - but there are ways to reduce it. Attempts
should therefore be made to reduce oxidation at each stage of
oil manufacture.
Oxidation is not one single reaction, but a complex series of
reactions. When oil oxidises it produces a series of breakdown
products in stages, starting with primary oxidation products
(peroxides, dienes, free fatty acids), then secondary products
(carbonyls, aldehydes, trienes) and finally tertiary products.
Oxidation progresses at different rates depending on factors
such as temperature, light, availability of oxygen, and the
presence of moisture and metals (such as iron). The type of
oil also influences the rate of oxidation. Marine oils (including
fish, mussel) are highly susceptible to oxidation due to the large
number of polyunsaturated fatty acids (PUFA) they contain.
These unsaturated fatty acids have reactive double bonds
between their carbon atoms, whereas saturated fats have no
double bonds so they oxidise more slowly.
Oil oxidation is an undesirable series of chemical reactions involving oxygen that degrades the quality of an oil. Oxidation eventually produces rancidity in oil, with accompanying off flavours and smells. All oil is in a state of oxidation - you cannot stop it completely - but there are ways to reduce it. Attempts should therefore be made to reduce oxidation at each stage of oil manufacture.Oxidation is not one single reaction, but a complex series of reactions. When oil oxidises it produces a series of breakdown products in stages, starting with primary oxidation products (peroxides, dienes, free fatty acids), then secondary products (carbonyls, aldehydes, trienes) and finally tertiary products. Oxidation progresses at different rates depending on factors such as temperature, light, availability of oxygen, and the presence of moisture and metals (such as iron). The type of oil also influences the rate of oxidation. Marine oils (including fish, mussel) are highly susceptible to oxidation due to the large number of polyunsaturated fatty acids (PUFA) they contain. These unsaturated fatty acids have reactive double bonds between their carbon atoms, whereas saturated fats have no double bonds so they oxidise more slowly.
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