Chemistry (17)

Of the two commercially important species of coffee - arabica generally contains more lipids than robusta averaging 15-17% and 10-11.5%, respectively. With the actual coffee bean only a small percentage of the lipid oil is actually contained in the waxy portion covering the bean, while the majority being distributed in the endosperm.   

Thursday, 23 April 2015 21:06

Carbohydrates in Coffee

Carbohydrates are perhaps one of the largest family of compounds in organic chemistry. As the name implies, carbohydrates are simply hydrated carbon molecules with complex structure. Of course, the most common carbohydrate is that of sucrose, or table sugar, but there are literally thousands of molecules in this branch of chemistry.  

Thursday, 23 April 2015 21:03

Quinic Acid

Quinic acid along with citric and malic represent a significant portion of coffee's total acid content. During roasting quinic acid progressively increases as the levels of chlorogenic acid decrease, suggesting that its formation results from the cleavage of the chlorogenic acid moiety. 

Thursday, 23 April 2015 21:00

Citric Acid

Like many living organisms, citric acid plays an important role as a key intermediate compound in the plant's metabolic cycle. In green coffee citric acid makes up a significant portion of coffee's total acid content and ultimately in the development of perceived acidity. 

Thursday, 23 April 2015 18:58

Chlorogenic Acid

Discovered in 1932, chlorogenic acids (CGA) represent a large family of esterified compounds present in green and roasted coffee. During roasting, CGA's slowly decompose to form caffeic and quinic acid with about 50% of the original CGA being destroyed in a medium roast. 

Friday, 24 April 2015 06:58

Phosphoric Acid

In coffee there are over thirty organic acids with perhaps the most common consisting of citric, malic, acetic, quinic, etc. But there is another branch of acids, namely norganic acids , that deserved special recognition, of these phosphoric acid plays a particularly important role.

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