V práci byla sledována kvalita sladů z celkem osmi pěstebních oblastí České republiky a pěti odrůd jarního ječmene ročníku 2005. Pro statistické hodnocení vztahu kvalitativních parametrů sladu s kvalitou piva je využito korelačních koeficientů. Mezi zjištěné zajímavé souvislosti patří např. aktivita lipoxygenasy s obsahem prekursorů dimethylsulfidu ve sladu či obsah aminodusíku v mladině s barvou piva.Ve stupni rozluštění sladů byl zjištěn rozdíl mezi jihomoravskou a západočeskou oblastí. Rozdíl mezi těmito oblastmi se projevil i v dosažitelném prokvašení a barvě piv. Prakticky ve všech případech byl zjištěn příliš vysoký obsah alfa-aminodusíku v mladinách i při příz-nivě nízkém obsahu bílkovin ve sladu, který je pro ročník 2005 charakteristický. Všechna piva měla velmi dobrou filtrovatelnost a obsah beta-glukanů ve sladech byl také příznivý. I za těchto podmínek byla zjištěna statisticky významná souvislost mezi rizikovým potenciálem stanoveným z homogenity sladu metodou Carlsberg a filtrovatelností piva. Výsledky naznačují výrazně vyšší výpovědní hodnotu tohoto kritéria oproti běžně užívaným analytickým parametrům. Senzorické hodnocení profilu připravených piv ukázalo pouze minimální rozdíly. In this work, the quality of malts from eight growing regions of the Czech Republic and five spring barley varieties of the year 2005 was monitored. Correlation coefficients were used for the statistical evaluation of the relation between the qualitative parameters of malt and beer quality. Among the interesting correlations found belongs for example the lipoxygenase activity and the dimethylsulphide precursor content in malt or the correlation between the amino nitrogen content and beer colour.There was found a difference in the degree of modification of malts between the South Moravian and the West Bohemian regions. This difference proved also in the attainable degree of attenuation and beer colour. Almost in all cases, a high content of alpha-amino nitrogen was found in hopped worts, even if the protein content in malt was favourably low, which is characteristic for 2005. All beers had a very good filterability; the beta-glucan content in malts was also very favourable. Even under these conditions, a statistically significant correlation was found between the risk potential determined from malt homogeneity by the Carlsberg method and beer filterability. Compared with commonly used analytical parameters, the results indicate a significantly higher predication value of this criterion. The sensorial evaluation of the profile of the brewed beers showed only a minimum difference. Škach
Tato část projektu je zaměřena na posouzení vlivu sladů, vyrobených z ječmenů z určitých oblastí v témže ročníku, na analytické aspekty a výslednou senzorickou kvalitu piva [1].Výsledky hodnocení nejsou ovšem ovlivněny pouze vlastní sklizňovou oblastí ječ-mene, ale především odrůdou a technologií sladování v jednotlivých sladovnách. Z těchto In this work, the quality of malts produced from the variety Jersey from 2006 and from 6 growing regions of the Czech Republic was monitored.There were found significant differences in the degree of modification of malts, which reflected in the content of total nitrogen as well as alpha-amino nitrogen in hopped worts and beers. Almost in all cases, a high content of alpha-amino nitrogen was found in hopped worts, even if the protein content in malt was favourably low. The beers had a low colour, which did not correspond to the Czech beer type of the given original gravity of hopped wort. A very good correlation was found between hopped wort / beer colour and the content of total nitrogen and alpha-amino nitrogen. All beers had a very good filterability; the beer foaming power was varying and did not relate to the qualitative parameters of malt. The sensorial evaluation of the profile of the beers brewed showed only minimum differences.The evaluation of one variety from all regions shows that the result is rather a determination of differences in technological processes being used in individual malting plants than a crop evaluation. This is also evidenced by several pieces of information based on the six-year up to now monitoring.
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