Abstract Brazil’s beer industry has experienced a significant growth over the recent years, driving professionals to seek brewing beer focused on quality aspects. As a result of this movement, the consumer attention to products that highlight the national or local identity has rocketed in recent times, especially Brazilian types of beers, as Catharina Sour. Catharina Sour beer was produced using the traditional method to acidify the wort by lactic fermentation and using a bee pollen, as a newer source of microorganism to produce sour beers. For that, mango and passion fruit were used, including barley and wheat malt, yeast, and hop. Some physicochemical analyses were made according to EBC (European Brewery Convention) guidelines, to raise information about the process and final product. There were close correlations between the physic-chemical, sensory and liquid chromatography analysis, showing that the presence of pollen, and consequently the presence of yeast, acetic acid bacteria and fructophilic lactic acid bacteria (FLABs), can bring different aromas to Catharina Sour beers, showing an excellent potential to use this newer source of microorganisms to produce sour beers.

Abstract Given the scenario of buckwheat cultivation in Brazil, the research was developed evaluating its insertion in beer production as adjunct. The samples of interest were made with 55% (w/w) barley malt and 45% (w/w) buckwheat malt (45BWM), referenced to 100% Pilsen malt beer (AM). The results showed that the buckwheat malt wort had a 96.27% dry base extract, equivalent to the standard result. It also showed that glucose content increased 3 times, while the maltose and maltotriose have balances proportional. The use of buckwheat malt raised the protein content in more than 89%, which is not seen from the use of other adjuncts and showed greater colloidal stability during the storage period, a factor associated with a 4-fold reduction of gluten content. Similar aspects regarding foam and turbidity pattern, although subtle differences in aromatic profile and flavors were present. Nevertheless, these factors show that is possible to use buckwheat as an adjunct in a Pilsen beer. The remaining sugars content gave a perspective on the metabolism of yeast during fermentation and the identification of some compounds by HPLC-MS was also able to demonstrate how buckwheat malt affected yeast metabolism due to wort composition.