Method for producing a soluble cocoa product from cocoa powder
The present invention relates to a method for producing a soluble cocoa product from cocoa powder comprising the steps: a) preparing an aqueous suspension of cocoa powder ( 1 ), b) treating said suspension with one or more degrading enzymes ( 2 ), c) submitting ( 3 ) the suspension obtained in step b) to a pH treatment comprising treating said suspension for at least 2 hours at a suitable pH, a temperature of at 10 least 100° C., and a pressure which is at least 1 bar higher than the ambient pressure, d) optionally bringing the pH of the suspension obtained in step c) to a pH value corresponding with the pH of the suspension obtained in step a), e) treating ( 4 ) the suspension obtained in step c) or d) with one or more degrading enzymes, f) separating ( 6 ) the suspension ( 5 ) obtained in step e) into insoluble material ( 8 ) and a soluble part ( 7 ), and g) obtaining soluble cocoa components ( 10 ) from the soluble parts ( 7 ). The present invention further relates to cocoa products obtained by the present method and use thereof.
1. A method for producing a soluble cocoa product from cocoa powder comprising the steps:
a) preparing an aqueous suspension of cocoa powder,
b) optionally treating said suspension with one or more degrading enzymes,
c) treating the suspension obtained in step b) for at least 2 hours at a pH of at least 10, a temperature of at least 100° C., and a pressure which is at least 1 bar higher than the ambient pressure,
d) optionally bringing the pH of the suspension obtained in step c) to a pH value corresponding with the pH of the suspension obtained in step a),
e) treating the suspension obtained in step c) or d) with one or more degrading enzymes,
f) separating the suspension obtained in step e) into insoluble material and a soluble part, and
g) obtaining soluble cocoa components from the soluble parts.
2. The method according to claim 1 , wherein said suspension is prepared by mixing the cocoa powder with a solution comprising salt in a below isotonic concentration.
3. The method according to claim 1 , wherein said suspension is prepared by mixing the cocoa powder with distilled water or double distilled water.
4. The method according to claim 1 , wherein said suspension is treated in step b) with one or more starch degrading enzymes.
5. The method according to claim 1 , wherein the ambient pressure in step c) is initially between 1 and 1.5 bar and is raised during step c) up to a pressure between 2 to 5 bar.
6. The method according to claim 1 , wherein said suspension is maintained in step c) for at least 3 hours at a pH of 10 to 14, a temperature of at least 120° C., and a pressure which is at least 1 bar higher than the ambient pressure.
7. The method according to claim 1 , wherein said suspension is brought in step d) to a pH of 5 to 7.
8. The method according to claim 1 , wherein enzymatic treatment in step e) of said suspension comprises the subsequent steps of:
e1) treating with one or more cell-wall degrading enzymes, and
e2) treating with one or more protein degrading enzymes.
9. The method according to claim 1 , further comprising a step of ultrasonic treatment during step c).
10. The method according to claim 1 , wherein the separation is performed by filtration, decantation, centrifugation, or a combination thereof.
11. The method according to claim 1 , wherein the suspension obtained in step b) is submitted to a heat shock treatment before being submitted to said pH treatment.
12. The method according to claim 11 , wherein said heat shock treatment comprises cooling the suspension obtained in step b) to a temperature below 0° C., followed by shock heating the cooled suspension by contact with a hot aqueous solution of at least 70° C.
13. The method according to claim 12 , wherein said aqueous solution is pure water or distilled or double distilled water at a temperature of between 95 and 100° C.
14. The method according to claim 1 , wherein said soluble cocoa components are freeze dried, roller dried or spray dried.
15. The method according to claim 1 , further comprising a step of desalting the soluble part obtained in step f).
16. The method according to claim 1 , wherein between 50 and 100% of the soluble components of the cocoa suspension of step a) are comprised in the soluble cocoa components of step g).