Rice malting optimization for the production of top-fermented gluten-free beer.

BACKGROUND: A safe method to obtain gluten-free beer led to the use of naturally gluten-free grains, such as rice, but the specific malting program for rice is long and requires a large amount of water, and the resulting beer showed a flat flavour profile. In this study, an optimization of the malting and brewing procedure is proposed to overcome the aforementioned issues. Different steeping conditions and kilning temperatures are considered, and a top-fermented beverage from rice malt is obtained for the first time.

RESULTS: The malting procedure has been optimized by assessing the use of short-time steeping as an alternate to long air rest to obtain sufficient moisture content in the green malt, saving water consumption. The malt obtained allowed a regular fermentation, as confirmed by the sensorial analysis, which did not reveal any off-flavours. The use of a top-fermenting yeast formed high content of higher alcohol and relatively low amount of esters.

CONCLUSION: This study confirms the potential of rice for the production of malt and beer. The optimized malting programme allowed water saving. The production of a top-fermented rice malt beer was a successful attempt to introduce a new flavoured product for consumption by individuals affected by coeliac disease. © 2018 Society of Chemical Industry.