Abstract: Provided are a sparkling beverage having effectively improved foam properties and a method of producing the same. The sparkling beverage has improved foam properties through an increase in content of a hydrophobic polypeptide or contains a hydrophobic polypeptide in an amount of 1.1 g/L or more. When the sparkling beverage is a sparkling alcoholic beverage, a method of producing the sparkling alcoholic beverage includes: a pre-fermentation step (10) of preparing a pre-fermentation solution using a raw material containing barley; and a fermentation step (20) of conducting alcoholic fermentation by adding a yeast to the pre-fermentation solution, in which foam properties of the sparkling alcoholic beverage are improved by treating the barley with a protease.

Abstract: Provided are a sparkling alcoholic beverage having improved drinkability and a method for producing the same. The method for producing a sparkling alcoholic beverage according to the present invention is a method for producing a sparkling alcoholic beverage, including: a pre-fermentation step (10) of preparing a pre-fermentation solution by using a raw material containing a nitrogen source and a carbon source and water; and a fermentation step (20) of conducting alcoholic fermentation by adding a yeast to the pre-fermentation solution, in which the raw material further contains laccase in the pre-fermentation step (10).

Abstract: The present invention provides a method for determination of the foam stability of a fermented malt beverage, wherein the concentration of yeast thioredoxin (MT) in the fermented malt beverage or a fermenting material solution of the fermented malt beverage is used as an index having a negative correlation with the foam stability of the fermented malt beverage, and the concentration of protein Z (MZ) in the fermented malt beverage or a pre-fermentation or fermenting material solution of the fermented malt beverage is used as an index having a positive correlation with the foam stability of the fermented malt beverage, to determine the foam stability of the fermented malt beverage. According to the determination method of the invention, it is possible to determine the foam stability from the concentration of prescribed proteins in the fermented malt beverage or pre-fermentation or fermenting material solution thereof without directly measuring the head retention of the fermented malt beverage.

Abstract: The present invention provides a method for determination of the foam stability of a fermented malt beverage, wherein the concentration of protein Z7 (MZ7) in seeds of a barley which is used as a material for the fermented malt beverage, a malt obtained from the seeds, a wort obtained from the malt, a fermented malt beverage obtained by fermenting the wort, or a pre-fermentation or fermenting material solution of the fermented malt beverage, is used as an index having a negative correlation with the foam stability of the fermented malt beverage, to determine the foam stability of the fermented malt beverage. According to the determination method of the invention, it is possible to determine the foam stability from the concentration of a prescribed protein in the barley seeds, malt, wort, fermented malt beverage or the like without directly measuring the head retention of the fermented malt beverage.