Effect of relative humidity on the migration of benzophenone from paperboard into the food simulant Tenax® and modelling hereof
The aim of this study was to investigate the effect of relative humidity on the migration of benzophenone from paperboard into the food simulant Tenax®. Kinetic migration investigations were carried out with three relative humidities in the interval between 39% and >73%. All investigations were carried out at a constant temperature of 34°C. It was found that the migration of benzophenone after more than 30 days was 4.8 times higher at a relative humidity of 64%–71%, and 7.3 times higher at a relative humidity of >73%, compared with that at a relative humidity of 39%–49%. Diffusion and partition coefficients were derived from the results by using a software for modelling migration in multilayer materials. Both the diffusion coefficient and the partition coefficient, between paperboard and Tenax®, decrease with increasing relative humidity. The experimental results were correctly modelled only when the paperboard was regarded as a one-layer system as compared with a two-layer system: where the main part of the paperboard (B1) has a high diffusion rate and a thin part of the paperboard (B2) in contact with the foodstuff has a lower diffusion rate.
The Food Standards Agency
2.2 The main purpose of BSE testing is to monitor the level of BSE in cattle over time and thereby check on the continued effectiveness of BSE controls. Currently EU legislation requires 25 MS (EU-25), i.e. all except Romania and Bulgaria, to BSE test all “risk cattle” aged over 48 months and all healthy cattle slaughtered for human consumption aged over 72 months (although they may opt to test younger cattle). The relevant legislation also states that, from 1 January 2013, these EU25 MS may decide to test only a minimum annual sample of healthy cattle slaughtered for human consumption aged over 72 months (O72M). The current UK monitoring programme is summarised at Annexe A.
Magnetic properties of Lu2Fe17 crystals
Abstract We present the results of crystal structure and magnetization studies of three single crystals grown from melts of different nominal compositions in the vicinity of the Lu2Fe17 stoichiometry. The ferromagnetic state of the crystals is strongly dependent on the real sample composition and the local atomic ordering. A drastic difference is observed in the behaviour of the ferro–antiferromagnetic transition, even in crystals for which almost identical composition and crystal parameters were determined by microprobe and X-ray analysis.