The studies of the applicability of headspace sampling coupled to mass spectrometry in discrimination of differently aged beers are reported. The entire mass spectra of headspace components provided “fingerprints” of the beer samples and were used for classification purposes. PCA analysis of the mass spectra revealed clustering of samples according to the aging procedure, allowing automated sample classification by appropriate chemometric methods.
In the article there is presented a characteristic of the basic factors of physicochemical stability of beer. It is discussed the colloidal stability of isoalpha acids in beer and its organoleptic stability in details is shown the progress of cold clouding and its constitution.
The beer foam quality is determined by the brewing process and the raw materials. Studies on the effect of beer production process on beer foam stability were reported in this review. The losses of foam positive compounds such as polypeptides during individual stages of brewing were described. Finally, the reasons why high gravity brewing results in beers of interior foam quality were shown.
Sensory qualities, such as the taste, the aroma or the color, that we receive by means of our senses;, are identification feature of every types of beer. There are lots of factors, that have an influence on these qualities. There are internal factors, that come from materials by beer production, and external factors, that are connected with all stages of production.
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