POWDERED COFFEE OF SUBLIMATION DRYING AND A METHOD FOR PRODUCTION THEREOF Russian patent published in 2020 - IPC A23F5/26 A23F5/32 

FIELD: coffee industry.

SUBSTANCE: one obtains a coffee extract containing from 40 to 55 wt % solid substances. One adds gas into the coffee extract in amount of 1 l (STP)/ kg to 5 l (STP)/kg of coffee extract to produce a gas-containing coffee extract at pressure higher than atmospheric pressure. Pressure is then relieved in the obtained coffee extract to form a foamed coffee extract. Frozen coffee extract is cooled down to −40 °C without shear rate or low shear rate to form a frozen coffee extract. Cooling step includes cooling the foamed coffee extract to a first temperature, cooling the foamed coffee extract from a first temperature to a second temperature, which is lower than the first temperature with duration of 5 to 90 minutes and cooling the foamed coffee extract from the second temperature to a temperature below −40 °C. First temperature is 1 °C above the freezing point of the foamed coffee extract, and the second temperature is 3 °C below the freezing point. Frozen coffee extract is grinded into a powder and dried. Freeze drying the coffee powder to produce the coffee beverage with a creamy foam, at least 0.25 cm³/g when reconstituted in water contains particles, including open gas bubbles and hollows from ice crystals and having closed porosity of less than 15 %. Open gas bubbles and ice crystal cavities have low mutual connectivity, so that less than 92 % of the intrusion is achieved at pressure of 0.6 MPa (90 abs. lbs/square inch) of Hg when measured by Hg-porometry, wherein intrusion into particles is considered to begin at 0.01 MPa (2 abs. lbs/square inch). Disclosed is a version of powdered coffee sublimation drying for production of coffee beverage.

EFFECT: group of inventions provides a product with improved foam properties, due to prevention of premature nucleation of ice crystals and growth of large crystals, thereby providing a new microstructure.

19 cl, 13 dwg, 6 tbl, 5 ex