Soluble coffee powder
A technology of powder and coffee extraction, which is applied in the field of preparing beverage powder mixture, soluble coffee powder, and preparation of soluble beverage powder, and can solve the problem that colored pigments are not allowed
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Embodiment 1
[0057] Example 1: Coffee powder prepared by freezing on a tray plate
[0058] Coffee extracts with a range of different total solids values (5%, 15%, 35% and 45%) were placed in rectangular tray containers maintained at -40°C.
[0059] The extract was allowed to coagulate (1 hour to 4 hours), after which it was crushed using a Frewitt hammer mill and ground using a Urschel mill with a pitch of 2 mm.
[0060] The resulting frozen extract was placed in a freeze-drying tray and dried under vacuum, the temperature decreased with a trend of 100°C → 80°C → 60°C → 40°C within three hours, and then kept at 40°C for fifteen hours. The coffee extract with total solids content of 5% and 15% was extracted to give golden and lustrous powder.
[0061] The color of the powder was measured using a HunterLab Colorflex (CX1051 ) device with an illuminator / observer set to D65 / 45°±2° and a 47mm sample holder. Based on the measured values of L*, a* and b* (in triplicate), the color differe...
Embodiment 2
[0073] Example 2: Microscopy and porosity measurements of coffee powder
[0074] Soluble coffee powders were prepared in the same manner as in Example 1, wherein the values of the total solids content before drying were 10%, 15%, 20% and 40%. The coffee extracts with total solids content of 10%, 15% and 20% were extracted to give golden and glossy powders.
[0075] Powders were inspected using scanning electron microscopy. SEM images are shown in figure 1 middle. It can be observed that although the total solids content is 10% ( figure 1 a), 15% ( figure 1 b) and 20% ( figure 1 The coffee extract of c) gave an extract with a "flaky" microstructure of thin parallel plates, but a total solids content of 40% ( figure 1 d) A less porous structure with thicker walls is obtained.
[0076] Mercury porosimetry data were also obtained for samples with TCs of 10%, 15%, and 20% to assess bulk density, skeletal density, and open pore volume. Structural evaluation was performed...
Embodiment 3
[0083] Example 3: Golden and lustrous coffee powder prepared by freezing between parallel plates
[0084] Roast and ground Arabica coffee was extracted at a total solids content of 10%. The total solids content was increased to 20% using membrane concentration. The extract was freeze-dried slowly between parallel plates for 12 hours at a temperature between -35°C and -45°C. No inflation is applied. The freeze-dried powder has a particle size of about 1.5mm and has a golden and shiny appearance.
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