This invention discloses a millet-based mixed grain beverage and its preparation method, belonging to the field of
deep processing technology for mixed grain beverages. The invention employs a two-stage hot
air temperature control process. First, the
roasting equipment is preheated, and then roasted at a low temperature of 45℃~55℃ to enrich γ-
aminobutyric acid (GABA). Next, it is roasted at a high temperature of 150℃~180℃ to form a protective layer on the grain surface, inhibiting
starch dissolution. Subsequently, it undergoes constant temperature sealed soaking, static clarification, and precision
filtration to obtain a clear extract. Finally, it is sterilized by UHT ultra-high temperature instantaneous sterilization and aseptic filling to obtain the finished product. The resulting beverage has no detectable
soluble solids,
sodium, or
heavy metals; clearly defined
potassium,
calcium, and
magnesium content; near-zero energy; and extremely
low protein, fat, and
carbohydrate content. It naturally contains γ-
aminobutyric acid (GABA),
dietary fiber, and various minerals. The product has a pH of 4.54, a light
transmittance of 89.6%, is clear and transparent, stable over time, contains no additives, and is suitable for both hot and cold consumption. The process is simple and controllable, suitable for industrial production.