How to handle the silver skin of coffee? do you know how to remove the silver skin of coffee beans?

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Washing method

Water washing is the most extensive treatment method at present, which is different from the sun method in that it uses fermentation to remove the pectin layer.

-removal of shoddy beans (same day drying method)

Put the coffee beans in a large tank, the underdeveloped inferior beans will float on the surface, and the mature ones will sink to the bottom of the water, which is to remove the floating coffee fruit.

-remove the peel and pulp

After the pulp screening machine, the exocarp and pulp of the coffee fruit were removed. It leaves pectin, endocarp and silver peel.

-fermentation

This step is the use of biological treatment to remove pectin. Put the coffee fruit treated by the pulp screening machine into the fermentation tank for 16 hours and 36 hours, the fermentation bacteria will dissolve the pectin.

-washing

After completing the fermentation and removing the pectin, the coffee beans will be washed again because the fermentation bacteria and impurities will remain on the coffee beans. In order to clean it, this step consumes a lot of water.

-drying and removing endocarp and silver peel

The coffee fruit is usually dried by machine (or sun-drying) so that the moisture content is reduced to 1014%. Then use a sheller to remove the remaining endocarp and silver peel, so that the processing can be completed.

Silver Skin/Chaff: coffee fruit (coffee bean), also known as coffee cherry, includes exocarp, pulp, pectin layer, shell (also known as parchment layer), silver skin, endosperm (that is, seeds, the coffee bean part we want). A very thin film between parchment and coffee beans is silver, which is commonly called "silver" because of its glossy and silvery color. This layer of silver will fall off during baking. When grinding coffee, it is usually found that there are some silver crumbs in the coffee powder, which are the silver skins that cannot be peeled off from the coffee beans when roasted.

"Silver skin" is the coffee skin crumbs detached from the roasting process of raw coffee beans, which belongs to "scraps" and is generally disposed of as garbage. The seemingly useless silver skin of coffee contains the same content of soluble fiber as oats. Some people in Pingtung in Taiwan use it as a raw material to develop health food, which is another manifestation of the added value of the coffee industry.

Through research and analysis, it is concluded that the dietary fiber of silver skin is higher than that of oats, which can promote the growth of lactic acid bacteria and has high antioxidant ability. through animal experiments, it is also found that silver skin health products can effectively regulate body fat and promote the growth of intestinal bacteria.

The silver skin of coffee, which used to be regarded as garbage, is expected to find new use value, although only 300 grams of coffee skin can be produced for every 10 kilograms of coffee beans.

In any case, once the market value of coffee silver skin is determined, it will be of great help to stabilize or even improve the income of coffee farmers.

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