Soluble coffee powder
The present invention relates to a soluble beverage powder of dried coffee extract. In particular to a soluble coffee powder having a gold appearance. Further aspects of the invention are a powder mix for preparing a beverage and a process for making a soluble beverage powder.
1. Soluble beverage powder consisting of dried coffee extract, the powder having a colour difference ΔE from gold below 100, a gloss at 60° geometry of at least 0.5 gloss units, wherein the skeletal density of the powder is from 0.7 to 1.4 g/ml, the powder comprises particles comprising at least one plate having a mean thickness of between 0.3 and 90 microns, and two or more plates comprised within a particle are substantially parallel.
2. The soluble beverage powder according to claim 1 having a gloss at 60° geometry between 0.5 and 1.7 gloss units.
3. The soluble beverage powder according to claim 1 , wherein the skeletal density of the powder is from 0.9 to 1.3 g/ml.
4. The soluble beverage powder according to claim 1 , wherein the powder comprises particles comprising at least one plate having a mean thickness of between 5 and 50 microns.
5. The soluble beverage powder according to claim 1 , wherein the two or more substantially parallel plates are separated by a gap.
6. The soluble beverage powder according to claim 1 wherein the powder is a glassy amorphous solid.
7. Powder mix for preparing a beverage comprising a soluble beverage powder consisting of dried coffee extract, the powder having a colour difference ΔE from gold below 100, a gloss at 60° geometry of at least 0.5 gloss units, wherein the skeletal density of the powder is from 0.7 to 1.4 g/ml, the powder comprises particles comprising at least one plate having a mean thickness of between 0.3 and 90 microns, and two or more plates comprised within a particle are substantially parallel.
8. A process for making a soluble beverage powder, the process comprising:
i. providing a coffee extract having a total solids content of less than 25%;
ii. freezing the coffee extract having a total solids content of less than 25% by unidirectional freezing at a temperature between −50 and −30° C. for a time between 1 and 12 hours;
iii. breaking-up the frozen coffee extract to a D4,3 particle size from 0.05 mm to 10 mm; and
iv. drying the frozen coffee extract.
9. The process according to claim 8 wherein the coffee extract is extracted at a total solids content of less than 25%.
10. The process according to claim 8 wherein the drying is performed under vacuum.
11. The process according to claim 8 wherein the freezing is performed between parallel cooling plates.
12. The soluble beverage powder according to claim 1 , wherein a bulk density of the powder is between 0.15 to 0.35 g/ml.
13. The soluble beverage powder according to claim 1 , wherein the powder comprises particles having an average ratio of particle height to the square root of projected area less than 0.4.
14. The soluble beverage powder according to claim 1 , wherein at least 30 wt. % of the particles comprise two or more substantially parallel plates.
15. The soluble beverage powder according to claim 5 , wherein the gap is greater than the mean thickness of the plates and less than 10 times the mean thickness of the plates.