Treatment methods of coffee beans after picking wet treatment steps
As harvest season draws to a close, I would like to add an overview of the coffee processing process. In this blog post, I will introduce you to the wet processing steps after coffee picking in Yunnan.
After harvest, the berries are either sent directly to a pulp collector (if the harvest is done well) or collected in a siphon tank filled with water. Berries are washed and separated in this tank. The stones sink to the bottom of the jar and are manually picked up when the jar is empty. Lighter berries will float on the water, along with leaves and twigs, using a hedge to remove them. The berries suspended in the water are then recovered by a siphon and transported to a pulp collector.
The purpose of pulp removal is to separate the pulp from the seed coat of the coffee bean. The pulp is removed by squeezing the berries. Because ripe berries contain a lot of water, coffee beans in their skins pop out easily when the berries are squeezed.
The next step is mucilage removal to remove the mesocarp residue that clings to the seed coat after pulp removal (see illustration of coffee berry parts). Since this slime is insoluble in water and adheres tightly to the seed coat, it cannot be removed by simple washing alone, so it needs to be either washed after fermentation or removed by strong friction in a device called a slime remover.
In Yunnan, this process is mainly accomplished through natural fermentation. The term fermentation is not 100% accurate because no biochemical reactions occur inside the coffee beans. It is more appropriate to refer to this process as mucilage removal by biochemical reaction or hydrolysis. This reaction is caused by enzymes naturally present in coffee berries.
The fermentation time varies from 6 to 72 hours, depending on conditions such as temperature, amount of mucus, and concentration of digestive enzymes. Coffee beans can be cleaned by placing the coffee in a fermenter until the mucus is completely broken down.
The key to coffee quality is to stop fermentation at the right time, because excessive fermentation can lead to so-called stinky coffee beans. If fermentation is insufficient or too slow, butyric acid or propionic acid is produced, both of which adversely affect coffee quality.
Fermented coffee with skin needs to be washed immediately after fermentation to terminate the process. However, after removing mucus and before washing, it may be necessary to soak the coffee with skin in water for 12 to 24 hours to reduce the bitter taste of the coffee beverage.
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Coffee Bean Selection 10 Elements to Consider When Choosing Coffee Green Beans
Green bean sellers are primarily responsible for grading coffee beans before selling them to coffee bean merchants. After grading, premium and premium coffee beans are selected, although they may have some flaws that do not affect the coffee rating. These flaws are less severe, but they can potentially damage coffee quality. Although Cupping is undoubtedly the clearest way to examine coffee beans
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The method of coffee processing basic knowledge of fine coffee
Within 8 hours after picking, the coffee fruit should be peeled, otherwise negative fermentation will occur, thus affecting the quality of coffee beans. There are three main methods of processing coffee: drying method, semi-dry treatment method and non-dry treatment method. The last method of treatment is adopted in Yunnan. The purpose of the treatment is to peel the coffee beans and reduce the water content of the coffee beans to an appropriate level.
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