KVASNY PRUMYSL

Quality analysis of Norwegian farmhouse malt: A case study

Vratislav Psota — 2024-10-15

In this case study, we conducted a detailed investigation into the quality of Norwegian farmhouse malt. We analysed the physical, chemical, and organoleptic properties of the malt. Our findings indicate that a specific sample of Norwegian farmhouse malt exhibits a distinct quality, attributed to the production process and the use of a non-malting barley variety with high nitrogen content. The sample of Norwegian farmhouse malt showed low values for all basic malting characteristics. Low values were found especially in cytolytic modification. Additionally, the sensory characteristics of this malt differed significantly from those of conventional, industrially produced malts, especially the smell of the malt and then the smell of the mash after smoke was distinctive.

The effect of nitrogen fertilisation, biostimulant application and extra-root phosphorus fertilization on yield and quality of malting barley grain

Renáta Dufková — 2024-10-15

A series of small-plot field trials were conducted between 2019 and 2021 with the spring barley variety Francin. The impact of Vital Root and YaraVita KOMBIPHOS on the grain quality of malting barley at varying nitrogen fertilization rates (50 kg·ha^-1 N, 70 kg·ha^-1N, 90 kg·ha^-1N, and 110 kg·ha^-1 N) was investigated. The following parameters were evaluated: grain size, thousand grain weight, specific weight, starch content, and protein content. The portion of grain <2.5 mm, weight of thousand grains, and specific weight decreased with increasing nitrogen fertilization. Additionally, a decrease in starch content was observed with an increase in protein content in the grain. The application of Vital Root and YaraVita KOMBIPHOS at lower nitrogen fertilization rates up to 70 kg·ha^-1N had a positive effect on grain quality.

Chemical and sensory profile of lager beers hopped with new Czech bitter varieties Boomerang and Gaia

Alexandr Mikyška — 2024-10-15

Characterising the sensory profiles of beers made from new hop varieties is of considerable importance for their application in brewing. New Czech bitter varieties Boomerang and Gaia were tested in three-year pilot brews (200 l) of 12% single-hopped pale lager, produced in kettle and kettle+dry-hopped variants. The hop-derived aroma and bitterness profile of the beers was evaluated using a comprehensive descriptive method. Hop-related volatiles in beer were determined by GC/MS-MS method. Both of these bitter varieties showed a pleasant bitterness profile even in dry-hopped beers. The overall impression of the beers from the varieties tested was favourable, at the level of the control beer (Saaz). The profile of hop derived volatiles and aroma in beers from Gaia and Boomerang varieties were different. The results show the potential of Boomerang for both single kettle-hopped beers and dry-hopped lagers due to its interesting aroma profile (spicy, herbal, floral). The Gaia variety can be used in a similar way, with a preference for dry hopping to give a well-balanced hop-derived aroma profile. Both varieties have shown considerable potential for the production of new beer brands, and their drought tolerance may also help their widespread cultivation.

Quality of beer with added pseudocereals

Nikol Šimečková — 2024-10-15

The effect on added pseudocereals (quinoa, amaranth, and buckwheat) on characteristics of beer was studied on beer samples prepared from barley malt, pseudocereals, water, hops, and brewer's yeast. Pseudocereals were used as a partial malt substitute (0%, 10%, 20%, 30%). The colour of laboratory prepared beers was measured using a Konica Minolta CM 3500d. Basic parameters of beers (alcohol content, real extract and original extract of the wort) were measured using a FermentoFlash. The amount of fructose, glucose, maltose and maltotriose in the wort and in the beers was determined using an Agilent Technologies HPLC. A sensory evaluation was also performed. The results of the different variants did not vary in terms of alcohol content. Beer lightness did not differ much between the pseudocereals variants. However, control beer was darker than beers with added pseudocereals. Generally, the beers with pseudocereals did not differ much from the control beer without pseudocereals.