Chemistry: molecular biology and microbiology – Process of utilizing an enzyme or micro-organism to destroy... – Treating animal or plant material or micro-organism
Patent
1994-07-07
1996-11-12
Beisner, William
Chemistry: molecular biology and microbiology
Process of utilizing an enzyme or micro-organism to destroy...
Treating animal or plant material or micro-organism
435272, 435275, 426635, 426637, 426417, C12S 318, C12S 314, C12S 312
Patent
active
055739482
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention comprises a method for processing of potatoes, a potato processing plant, and a use of the potato processing plant.
BACKGROUND OF THE INVENTION
The processing of potatoes is an old art. Potato starch and potato fodder protein are the main products obtainable from the crude potato starting material. Potatoes have to be processed shortly after harvesting; otherwise both the starch and the protein are degraded. This means that a potato processing plant is only working around 4 months a year. The remaining part of the year the potato processing plant is shut down.
Obviously, it is a desideratum to put the potato processing plant to a useful purpose during the remaining part of the year, as this would result in a vast economic advantage. However, so far no one has been able to solve this problem.
Thus, it is the purpose of the invention to provide an economically sound method for processing of potatoes, which is carried out in a plant, which can be used for another useful purpose outside the potato season.
Now, surprisingly, according to the invention it has been found that the purpose of the invention can be fulfilled if the potato processing is carried out enzymatically and if the potato processing plant is modified slightly; in this manner the plant can be used for processing of rape outside the potato season, an enzymatic rape process being used. In relation to the invention a special enzymatic rape processing is used, which is well suited for combination with the potato processing.
Also, flax, sunflower, soy beans and other oil containing seeds related to rape, or olive fruit can be substituted for rape in the method, plant and use according to the invention. However, for the sake of brevity, these oil containing crops will be referred to as rape in the following.
SUMMARY OF THE INVENTION
Thus, the method according to the invention for processing of potatoes is characterized by the fact that the method is carried out in a potato processing plant, which comprises an oil separator, heating equipment and at least one enzyme reactor, and which is modified in such a manner that it can also be used for processing of rape. It is not obvious that the above indicated modifications are relatively small and of such a nature that the potato processing plant in an economically sound manner can be used for e.g. rape processing outside the potato season. The skilled worker in the art will understand that the ratio between the duration of the "potato period" and the duration of the "rape period" should be adapted in such a manner that the single pieces of equipment in the plant are utilized optimally. Usually the "potato period" will amount to between 3 and 6 months, and correspondingly the "rape period" will amount to between 9 and 6 months.
A typical potato processing plant functions in the following manner. The potatoes are washed by means of water, and stones and dirt are removed. Subsequently the potatoes are disintegrated by milling. Water may be added to facilitate the separation of juice (fruit water). The separation of juice is performed by decanters. The macerated potatoes are then extracted in centrifugal sieves. The starch leaves the stainer basket as a filtrate. From this filtrate the starch is recovered by means of nozzle bowl separators or cyclones, and then the starch is dewatered and dried. The pulp discharges as filter overflow from the centrifugal sieves. The extracted pulp is treated according to WO 93/15615, i.e. the pulp is cooked, preferably at 140.degree. C. at a holding time of 20 seconds, and the cooked slurry is hereafter cooled to 50.degree. C. and transferred to a stirring tank and treated with a cell wall degrading enzyme. The fruit water is treated according to WO 93/15616. Specifically, the fruit water is subjected to a heat treatment to at least 125.degree. C. for at least 3 minutes, whereafter the heat treated potato fruit water is cooled to a temperature, at which enzymes are relatively stable, then enzymatically treated with a proteinase, and
REFERENCES:
patent: 3891770 (1975-06-01), Sato et al.
patent: 4167584 (1979-09-01), Nelson
patent: 5013561 (1991-05-01), Goering et al.
Olsen Hans S.
Wormslev Erik C.
Agris, Esq. Cheryl H.
Beisner William
Novo Nordisk A S
Zelson Esq. Steve T.
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