Preserving beer freshness in plastic bottles (Part 2)
The first contribution (see also Brauwelt International, No. 6/03, page 404) summarised the current situation for bottling beer in PET and described properties of plastic bottles made of various materials. A novel secondary packaging of plastic bottles, the "PET pack", patent number 102 17 114.9 pending, was also presented (1). This contribution describes the analytical results of a test series.
The objective of the tests (which lasted for over four months) was to determine taste stability of beer in monolayer bottles in the form of the "PET pack", compared to beer in PET monolayer bottles without special protection and also compared to glass bottles.
Other items included determination of staling flavour according to Eichhorn (2), aniline index (3) and lag time (4, 5)...
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