A study of the formation of 1cholesterol oxidation products (COPs) has been carried out in four 2ready-to-eat
(RTE) foods (cooked ham, Spanish Serrano ham, minced beef, and soft cheese). The samples were previously
treated with electron-beam irradiation between 1 and 8 kGy. Three COPs, 25-hydroxycholesterol, 7-
ketocholesterol and 6-ketocholestanol, were extracted together with the lipid fraction using chloroform.
Then, COPs were isolated by sample clean up using 3solid phase extraction (SPE) and were analyzed by 4high
performance liquid chromatography with ultraviolet detection (HPLC-UV). Method validation was
established by precision and recovery studies. Results showed that non-irradiated cheese and cooked ham
samples did not contain COPs. In general, an increase in COP content was observed in all cases when the
irradiation dose increased, although this increase was not linear. The 6-keto COP was not detected in any of
the RTE food samples studied regardless of the irradiation dose.
Industrial relevance: Nowadays, changes in dietary habits have produced an important increase in
consumption of prepared foods thus increasing microbiological contamination risks; consequently, it is
necessary to apply easy methods, able to be implanted in industrial production lines, and which eliminate
potential contaminants and enhance shelf life. The application of E-beam irradiation to vacuum packed readyto-
eat (RTE) food of animal origin could be a useful technique for sanitization purposes; besides, it is a clean,
rapid and environmentally friendly treatment. During this treatment cholesterol oxide products (COPs) may
be formed. They have received considerable attention in recent years because of their biological activity which
has been associated with human diseases, such as the inhibition of cholesterol biosynthesis, atherosclerosis,
changes in membrane properties, cytotoxicity, mutagenesis and carcinogenesis. Therefore, COP analysis in
food samples of animal origin is of great interest.
In this work, an increase in the 25-OH and 7-keto COP content has been detected after E-beam irradiation with
doses from 1 to 8 kGy, which is in the upper accepted limit in other foods, but final COP concentrations found
in the foodstuffs studied here were at least one order of magnitude lower than those which produce toxic
effects in in vivo and in vitro experiments. Analysis was made by HPLC with UV detection; so, two COPs with
absorption properties were used as targets.
©
A study of the formation of 1cholesterol oxidation products (COPs) has been carried out in four 2ready-to-eat
(RTE) foods (cooked ham, Spanish Serrano ham, minced beef, and soft cheese). The samples were previously
treated with electron-beam irradiation between 1 and 8 kGy. Three COPs, 25-hydroxycholesterol, 7-
ketocholesterol and 6-ketocholestanol, were extracted together with the lipid fraction using chloroform.
Then, COPs were isolated by sample clean up using 3solid phase extraction (SPE) and were analyzed by 4high
performance liquid chromatography with ultraviolet detection (HPLC-UV). Method validation was
established by precision and recovery studies. Results showed that non-irradiated cheese and cooked ham
samples did not contain COPs. In general, an increase in COP content was observed in all cases when the
irradiation dose increased, although this increase was not linear. The 6-keto COP was not detected in any of
the RTE food samples studied regardless of the irradiation dose.
Industrial relevance: Nowadays, changes in dietary habits have produced an important increase in
consumption of prepared foods thus increasing microbiological contamination risks; consequently, it is
necessary to apply easy methods, able to be implanted in industrial production lines, and which eliminate
potential contaminants and enhance shelf life. The application of E-beam irradiation to vacuum packed readyto-
eat (RTE) food of animal origin could be a useful technique for sanitization purposes; besides, it is a clean,
rapid and environmentally friendly treatment. During this treatment cholesterol oxide products (COPs) may
be formed. They have received considerable attention in recent years because of their biological activity which
has been associated with human diseases, such as the inhibition of cholesterol biosynthesis, atherosclerosis,
changes in membrane properties, cytotoxicity, mutagenesis and carcinogenesis. Therefore, COP analysis in
food samples of animal origin is of great interest.
In this work, an increase in the 25-OH and 7-keto COP content has been detected after E-beam irradiation with
doses from 1 to 8 kGy, which is in the upper accepted limit in other foods, but final COP concentrations found
in the foodstuffs studied here were at least one order of magnitude lower than those which produce toxic
effects in in vivo and in vitro experiments. Analysis was made by HPLC with UV detection; so, two COPs with
absorption properties were used as targets.
©
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