Influence of the malting parameters on the haze formation of beer after filtration
ABSTRACT Malting changes the chemical and enzymatical composition of barley. During malting, enzymes are synthesized, cell walls (pentosans,
proteins, etc.) degraded and starch becomes available for enzymatic attack. The progress of germination defines the final
beer quality and processability in several aspects: mouthfeel, foam and haze formation (different proteins), processability
(viscosity caused by certain substances, like β-glucan), fermentation progress (FAN, sugar content), etc. The objective of
this research was to study the influence of different modified malt on turbidity in beer after filtration. This was achieved
by analyzing selected malts at different germination stages and afterward studying their influence on the final beer composition,
focusing on protein content and composition. Protein fractions were analyzed using a Lab-on-a-Chip technique, which separates
the proteins—based on their molecular weight—by capillary electrophoresis. This analysis was supported by the use of two-dimensional
gel electrophoresis (2D-PAGE). Additionally, common malt and beer analyses and turbidity and filterability measurements were
performed. The protein composition could be followed from malt to beer with both the Lab-on-a-Chip technique and 2D-PAGE.
No differences in protein composition could be seen in the final protein composition of the beer. However, it could be observed,
with Lab-on-a-Chip technique, that high amounts of a protein fraction with a size of 25–28kDa caused increased turbidity
in the beer.
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ABSTRACT: The demand for gluten-free foods is certainly increasing. Interest in teff has increased noticeably due to its very attractive nutritional profile and gluten-free nature of the grain, making it a suitable substitute for wheat and other cereals in their food applications as well as foods for people with celiac disease. The main objective of this article is to review researches on teff, evaluate its suitability for different food applications, and give direction for further research on its applications for health food market. Teff is a tropical low risk cereal that grows in a wider ecology and can tolerate harsh environmental conditions where most other cereals are less viable. It has an excellent balance of amino acid composition (including all 8 essential amino acids for humans) making it an excellent material for malting and brewing. Because of its small size, teff is made into whole-grain flour (bran and germ included), resulting in a very high fiber content and high nutrient content in general. Teff is useful to improve the haemoglobin level in human body and helps to prevent malaria, incidence of anaemia and diabetes. The nutrient composition of teff grain indicates that it has a good potential to be used in foods and beverages worldwide. The high levels of simple sugars and α-amino acids as a result of breakdown of starch and protein, respectively, are essential for fermentation and beer making.Journal of Food Science and Technology -Mysore- 08/2013; · 1.12 Impact Factor