How to Pasteurize Grape Pulp
The ability to store grape juice on the store shelf without it going bad or fermenting is due to the pasteurization process that the grapes and grape pulp undergo. The pasteurization process heats the grape juice to a temperature that kills all the bacteria that could cause spoilage and fermentation. During the processing of grapes, the peel, pulp, seeds and stems enter a press and juice releases from the pulp. Once the pulp leaves the press, it passes back to the farmer as mulch. Pasteurization of the juice from the pulp occurs before it mixes with the first juice obtained. Does this Spark an idea?
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Things You'll Need
- Juice grapes
- Destemming Machine
- Dejuicer
- Holding tank
- Grape press
- Filter
- Heat source
- Storage tank
Instructions
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1
Empty the juice grapes into the destemming machine and crush the grapes to release most of the juice. During the first stage, stem removal occurs and the grapes pass through to a holding tank. The process of separating the grapes and stems crushes the grapes and releases some of the juice.
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2
Heat the holding tank to help remove the deep rich color and full flavor of the grapes. The grapes are agitated and then moved to the dejuicer.
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3
Separate the juice from the peels, pulp and seeds using the screen at the end of the dejuicer. The juice passes to heating tanks to raise the temperature to 185 degrees F. This temperature is high enough to kill the bacteria and other microorganisms that cause the juice to spoil and ferment. The remaining parts of the grapes move into the press, and any remaining juice is removed by the pressure and grinding of the press. The recovered juice moves into holding tanks.
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4
Heat the holding tanks to 185 degrees F to pasteurize the juice and hold the temperature at this level for 20 minutes. The juice merges with the first juice collected and moves to the bottling facility. There are two more pasteurizing processes performed before the bottled juice leaves the facility.
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5
Remove the waste product of the grapes and transfer back to the farmer for mulch.
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References
- Photo Credit Jupiterimages/Photos.com/Getty Images
