Evaluation of force-carbonated Czech-type lager beer quality during storage in relation to the applied type of packaging

摘要

The scope of the study was the evaluation of selected physicochemical parameters and organoleptic properties of Czech-type lager beer [11.00% (w/w) original wort extract; 4.60% (v/v) ethyl alcohol content] during a 12-month storage period (25 +/- 2 degrees C), in relation to the applied type of packaging [glass bottle, aluminum can, polyethylene terephthalate (PET) bottle and stainless steel beer keg]. The examined beer samples organoleptic characteristics were off-flavors, carbonation level, fullness, bitterness intensity and overall rating. Furthermore, the examined physicochemical parameters during storage were CO2 concentration, color, turbidity (haze) and foaming stability. Generally, the type of packaging significantly influenced the physicochemical and organoleptic properties of the examined samples (P 0.05). The more intensive changes were observed in the CO2 content, color and turbidity of the examined samples. The aluminum can and stainless steel keg were evaluated as the most suitable types of packaging for beer storage. On the contrary, the PET bottle was evaluated as the least appropriate for long-term storage period.