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Processing of Coffee Beans

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1. Processing of Coffee Beans
a. Roasting
In this process potential tastes of green coffee beans are brought up totally. Main aim in roasting is losing humidity and solid matters. In pink-roasted 3-5% humidity, roasted 5-8% humidity and in hard roasted 8-14% humidity is losing. For this operation roasters which have 188-282 C temperature, are used for 12-30 minutes. Roasting coffee may put on the market after special packaging operation.
b. Extraction
After roasting coffee beans are ground and allow passage of the substance from the solid phase to the liquid phase is subjected to extraction. Yield increases with increasing temperature and decreasing particle size. Due to the high degree of roasting solid / solvent ratio increase the yield reduces. Take place in two stages:
• Washing cycle: Extraction of surface-soluble substances.
• Diffusion phase: extraction of substances soluble cellular particles.
There are three steps for the extraction of roasted coffee beans. It is difficult to extraction of components such as carbohydrates, the first step of extraction of coffee beans at a pressure higher than atmospheric pressure (approximately 10% of atmospheric pressure) is passed through the cells in the 140-180 C hot water.
The next step, for the use of extraction more flavorful agent beans passed through into two or more cells which are at100 C water is passed through. Finally the coffee extract is passed through a heat exchanger that cools the extract up to about 50 C. At the end of this circulation of coffee extract obtained contains 20-30% solids.
Extraction process to keep the time as short as possible (max. 30 min) is recommended for positively affect the taste and flavor.

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