Pasteurisation process for microbial cells and microbial oil
First Claim
1. A process for pasteurizing microbial cells or microorganisms, the process comprising:
- (a) heating the cells or microorganisms from 40°
C. to 60°
C. in no more than 30 minutes or (b) heating the cells or microorganisms from 40°
C. to 60°
C. at a rate greater than 0.5°
C./minute or (c) heating the cells or microorganisms from 40°
C. to 60°
C. in no more than 30 minutes at a rate greater than 0.5°
C./minute or (d) heating the cells or microorganisms and maintaining the heated cells or microorganisms at an elevated temperature (T, °
C.) for a time (t, minutes) at a plateau stage, wherein the product T.t is from 140 to 100,800°
C.minute.
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Accused Products
Abstract
An improved pasteurisation protocol for pasteurising microbial cells is disclosed. The protocol has three stages, a first heating stage, a second plateau stage at which the cells are held at a (maximum and) constant temperature, and a third cooling stage. Both the heating and the cooling stages are rapid, with the temperature of the cells passing through 40 to 80° C. in no more than 30 minutes in the heating stage. The heating rate is at least 0.5° C./minute and during cooling is at least −0.5° C./minute. The plateau maximum temperature is from 70 to 85° C. By plotting the pasteurisation protocol on a time (t, minutes) versus temperature (T, ° C.) graph, one obtains a trapezium having an area less than 13,000° C. minute. Not only does this result in a smaller energy input (and so a reduction in costs), but a better quality (and less oxidised) oil results having a peroxide value (POV) of less than 1.5 and an anisidine value (AnV) of less than 1.0.
25 Citations
12 Claims
-
1. A process for pasteurizing microbial cells or microorganisms, the process comprising:
- (a) heating the cells or microorganisms from 40°
C. to 60°
C. in no more than 30 minutes or (b) heating the cells or microorganisms from 40°
C. to 60°
C. at a rate greater than 0.5°
C./minute or (c) heating the cells or microorganisms from 40°
C. to 60°
C. in no more than 30 minutes at a rate greater than 0.5°
C./minute or (d) heating the cells or microorganisms and maintaining the heated cells or microorganisms at an elevated temperature (T, °
C.) for a time (t, minutes) at a plateau stage, wherein the product T.t is from 140 to 100,800°
C.minute. - View Dependent Claims (3, 4, 5, 6, 7, 9, 10)
- (a) heating the cells or microorganisms from 40°
-
2. A process for pasteurizing microbial cells or microorganisms that comprises three stages, the process comprising:
- (a) a (first) heating stage, a (second) plateau stage at which the cells or microorganisms are maintained at a constant temperature, and (c) a (third) cooling stage.
- View Dependent Claims (8)
-
11. A microbial oil comprising a triglyceride content of at least 90%;
- a peroxide value (POV) of less than 1.5, or optionally less than 1.0; and
/or an anisidine value (AnV) of less than 15, or optionally less than 12. - View Dependent Claims (12)
- a peroxide value (POV) of less than 1.5, or optionally less than 1.0; and
Specification