Mathematical modeling of rice cooking and dissolution in beer production

Abstract

When beer is brewed in Asia, rice is traditionally used as an adjunct to provide additional sugars for the fermentation process. Under sufficiently high temperatures, the grain, which is primarily composed of starch, takes up water. The starch undergoes a gelatinization reaction when the moisture content is sufficiently high. Stirring and enzyme activity facilitate the removal of the outer gelatinized rice layers, and this starch dissolves into solution. The starch molecules are subsequently broken down by enzymes. The water uptake, gelatinization, and dissolution processes are modeled using a modified diffusion approach. The mass of starch molecules dissolved in solution as the cooking proc..