The researchers identified two compounds related to the bitterness of coffee
Although this is done to reconcile the bitterness of the drink, the reason why coffee makes us frown has puzzled scientists for decades. Now, researchers have narrowed the search by identifying two compounds associated with the bitterness of coffee, whether mild breakfast coffee or Italian espresso. A study presented at the annual meeting of the American Chemical Society in Boston showed that it was the roasting process-not the coffee beans themselves-that produced these compounds, a discovery that opened the door to improving the processing of coffee beans.
Since the 1930s, scientists have isolated and identified a variety of chemicals related to the sensory composition of coffee, but no one can figure out what makes coffee so bitter.
To solve the mystery, Thomas Hofmann, a food chemist at the Technical University of Munich, Germany, and his colleagues continuously filtered the brewed coffee. They found that a small portion of the filter products contained the lowest molecular weight and the most bitter compounds, which undoubtedly provided a goal for the research team to conduct in-depth analysis. Using mass spectrometry, the researchers determined that one of the compounds was a decomposition product of chlorogenic acid lactone, chlorogenic acid, which is found in almost all plants. The team then baked a range of drinks from regular coffee to bitter coffee and measured the amount of chlorogenic lactone in each coffee.
The researchers found that roasting coffee beans will produce a continuous reaction, first, the chlorogenic acid in the coffee beans will be converted into chlorogenic acid lactone, and then, if the processing continues, the latter will be broken down into phenyl dihydroindene. Hofmann pointed out that chlorogenic acid lactone can produce moderate bitterness in lightly or moderately roasted coffee, while the subsequent secondary decomposition products are the root cause of the "bitterness" of espresso.
Peter Martin, a professor of psychiatry at Vanderbilt University in Nashville, Tennessee, said the identification of secondary decomposition products provides new material for studying the potential health effects of coffee. Martin is currently the director of the Coffee Research Institute of the university. "just as we know very little about chlorogenic acid, we don't know much about other products related to it," he said. " "this study broadens our horizons to better understand the health effects of coffee, and for the coffee industry, it will help improve the taste of coffee," Martin said.
- Prev
2014 Beijing International Coffee Expo
The 2014 Beijing International Coffee Expo, sponsored by Beijing International Coffee Industry Association and China International Trade Center, was held at Beijing International Trade Convention and Exhibition Center (18 Yangfang Dian East Road, Haidian District, Beijing) from June 20 to 22, 2014. Asian Coffee Association was invited to participate. It is an important exhibition for the domestic coffee industry and an excellent platform for domestic and foreign enterprises to develop China's coffee market.
- Next
The coffee should be finished as soon as possible.
Every afternoon, make a cup of coffee, the strong fragrance can not only refresh the mind, but also relieve stress and relax.
Related
- Can I put a thermos in a thermos pot to keep my coffee warm? Why does coffee not taste so good after it cools down? What is the most suitable amount of milk for latte?
- How to make coffee cream? Do I have to use instant powder for 400 hand-made coffee? What is the composition of coffee cream in Naples coffee?
- What is an authentic cappuccino? How to make cappuccino golden circles? What is the ratio of coffee to milk in a cappuccino?
- Can espresso beans be used to make hand-brewed coffee? What is the difference between Italian mixed beans and hand-made single beans? What are the characteristics of SOE coffee beans?
- Big battle! Mixue Ice City has opened three stores in the United States?!
- Lucky launches rice milk latte! Netizen: After drinking it, I thought I bought it an ordinary latte
- Remove the perimeter! Naixue's largest flagship store in the world quietly closed!!
- Manner Co-branded Cup is a literary style?! Netizen: I almost didn't recognize it
- How to make bubble ice American so that it will not spill over? Share 5 tips for making bubbly coffee! How to make cold extract sparkling coffee? Do I have to add espresso to bubbly coffee?
- Can a mocha pot make lattes? How to mix the ratio of milk and coffee in a mocha pot? How to make Australian white coffee in a mocha pot? How to make mocha pot milk coffee the strongest?