The baking degree determines the taste spectrum towards deep roasting, shallow roasting, moderately roasted coffee beans.

Coffee taste spectrum consists of "smell spectrum" and "taste spectrum"; the former directs dry and wet fragrance, while the latter refers to water-soluble taste. The aroma of "odor spectrum" is appreciated by the sense of smell before and after the nose, and the liquefaction taste of "taste spectrum" is captured by the sense of taste. The "smell" and "taste" of coffee often vary with variety, altitude, soil and water, producing area, post-preparation, extraction and roasting degree, but the biggest cause depends on the roasting degree and technology.

The baking degree determines the trend of taste spectrum.

A. "shallow baking": from the middle of the explosion to the end of the explosion, Agtron#75-#66.

Most of the aromatic compounds formed by "shallow baking" are low molecular weight compounds, and the aroma and taste are easy to identify, including sour aroma, herbs, cinnamon, nutmeg, shell, nuts and toast, with the lightest weight and the highest volatility. The flowers of coffee

The sour aroma is the product of "enzyme action", while the smell of shell and bread is the smell in the early stage of Mena reaction in the baking process. The two construct the main taste spectrum of shallow baking.

B. "medium roasting" means Agtron#65-#55 from the end of the first explosion to before the second explosion.

The aromatics of "medium baking" are mainly medium molecular weight compounds with slightly higher mass and moderate volatility, mainly furan compounds (Furan) and pyrazine compounds (Pyrazine), and also have the characteristics of rising into the nasal cavity, which is the mid-term product of caramelization and Mena reaction in the baking process. The aroma is dominated by caramel, cream sugar and chocolate. Although medium baking still has sour flavor, nutty and toast flavor, it is obviously weaker than "light baking".

C. "medium-deep roasting" refers to the violent explosion from the first to the middle of the second explosion, Agtron#54-#40.

D. "Deep roasting" means two exploding tails, Agtron#40-#30.

The aromatics of "medium and deep baking" and "deep baking" are high molecular weight compounds with higher mass than the former two, with low volatility and almost no sour fragrance. They are the products of dry distillation at the end of baking, mainly mercaptan, resin, tar and phenolic compounds, and can be summarized as turpentine, alcohol, tar, choking incense, and the sweet and bitter taste of caramel and caramel.

Three sources, nine charm

After baking, raw beans produce many odors that promote and suppress each other, including fruit, caramel, cream, resin, wine, rice and wheat, stew, pepper, pizza and spice. It is difficult to find a main flavor for coffee

Therefore, the sources of coffee aroma can be divided into three categories: "enzyme action", "sugar browning reaction" and "dry distillation".

a. Shallow baking highlights the "enzyme effect":

1. "Hua Yun", 2. "Fruit Rhyme", 3. "Herbal Rhyme".

b. Medium baking highlights the "sugar browning reaction":

1. "Nut rhyme", 2. "caramel rhyme", 3. "Chocolate rhyme".

C deep baking highlights "dry distillation":

1. "resin rhyme", 2. "Xin Xiang Yun", 3. "charcoal burning rhyme".