The ultra performance convergence chromatography method was developed to detect the migration of four phthalates (PAEs) in plastic food contact materials. Plastic food contact materials samples are immersed with oil-based (isooctane) and water-based simulants (10% ethanol, 4% acetic acid and water), respectively. The pre-treatment method of four kinds of PAEs in the simulated immersion solution was optimized. The relationship between migration behaviour and the simulants, migration temperature and migration time were studied. The results show that PAEs were more likely to migrate in oily simulants. Within a certain range, the migration amount increased with the extension of immersion time. The migration rate and amount enhanced with the temperature.
The migration rules of acrylate monomers in plastic food contact materials were studied in this work. The migration rules of two acrylate monomers from food packing materials to four different stimulants including pure water, 4% acetic acid, 10% ethanol and isooctane were investigated by supercritical fluid chromatography (SFC) technology. The effects of food simulation species, concentration of ethanol, migration time and migration temperature on the migration amount of acrylate monomers were studied. The results showed that the migration of acrylate monomers in different food simulants were in the order: 10% ethanol>4% acetic acid>isooctane>water. Moreover, acrylate monomers were more likely to migrate in high concentration of ethanol. In the same food simulation, the migration of acrylate monomers increased with the increase of temperature and time. This study can provide theoretical basis and technical support for food safety control in the process of production, storage and transportation.
Consumption of chicken offal is common and famous among Malaysians as it is often
served as one of the side dishes with rice. Chicken offal can be a potential source of
Listeria monocytogenes because slaughtered animals are recognized as a reservoir for
foodborne pathogens. L. monocytogenes is a dangerous foodborne pathogen which can
cause severe foodborne listeriosis with high fatality rate. This study aimed to determine
the efficacy of different washing pre-treatment and cooking methods to reduce L.
monocytogenes in artificially contaminated chicken offal. All the washing pre-treatments
(dip treatment in different water sources and wash treatment with different water flow
rates) showed significant reduction of the pathogen (p<0.05) when the inoculated samples
were treated from 2 mins onwards. Washing the inoculated samples under the water flow
rate of 2 L/min was the most effective way to reduce the number of L. monocytogenes
(approximately 1.97 log reduction after washing for 10 mins). For heat treatment study,
deep-frying was the most effective cooking method followed by boiling and pan-frying to
reduce L. monocytogenes where all L. monocytogenes cells (7.91 log10 CFU/g) were killed
within 45 s under deep-frying treatment. Overall, the study indicated that washing under
running tap water (2 L/min) and deep-frying was effective in reducing and controlling the
microbial populations during food preparation. The findings from this study can serve as a
safe preparation step and cooking guideline. It is necessary to implement safe steps in
food handling practices among food handlers to minimize the risk of foodborne infection.
A rapid method for the detection of bisphenols was established by ultra performance convergence chromatography (UPC2). The migration rules of bisphenols in four different simulants including of pure water, acetic acid, ethanol and isooctane were first studied, and the effect of extraction solvent on recovery of bisphenols in aqueous simulants was also investigated. Furthermore, the influence of extraction solvent on recovery of bisphenols in aqueous simulants was discussed, and the relationship between migration amount of bisphenols and food simulants, migration time, migration temperature and other factors were explored. The experimental results showed that toluene exhibited the optimal extraction efficiency for bisphenols in aqueous simulants; bisphenols presented the most obvious migration in fatty food simulants; the migration amount of bisphenols increased with the extension of time; the migration rate and amount of bisphenols also enhanced with the increment of contact temperature.
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