{"id":113,"date":"2009-11-16T08:00:33","date_gmt":"2009-11-16T08:00:33","guid":{"rendered":"https:\/\/www.coleparmer.com\/blog\/?p=113"},"modified":"2021-03-29T15:49:28","modified_gmt":"2021-03-29T21:49:28","slug":"why-is-coffee-bitter","status":"publish","type":"post","link":"https:\/\/www.coleparmer.com\/blog\/why-is-coffee-bitter\/","title":{"rendered":"Why is coffee so bitter? Chemists use advanced chromatography techniques to find answers"},"content":{"rendered":"

Published with permission. Initially published in the IFT Weekly Newsletter, August 22, 2007<\/a><\/p>\n

Why is Coffee So Bitter \u2013 it\u2019s not the Caffeine<\/h2>\n

What makes coffee so bitter, aside from being constantly cast as a wake-up caller? Two classes of compounds have been ID\u2019d as the perpetrators, according to chemists in Germany and the United States who say they have identified the chemicals that appear to be largely responsible for java\u2019s bitterness, a finding that could one day lead to a better tasting brew. Their study, one of the most detailed chemical analyses of coffee bitterness to date, was presented Tuesday at the American Chemical Society national meeting in Boston.<\/p>\n

Research by others over the past few years has identified an estimated 25 to 30 compounds that could contribute to the perceived bitterness of coffee. But the main cause of coffee bitterness has remained largely unexplored until now, the researchers say.<\/p>\n

\u201cEverybody thinks that caffeine is the main bitter compound in coffee, but that\u2019s definitely not the case,\u201d said study leader Thomas Hofmann, Ph.D., a professor of food chemistry and molecular sensory science at the Technical University of Munich in Germany. Only 15 percent of java\u2019s perceived bitterness is due to caffeine, he estimates, noting that caffeinated and decaffeinated coffee both have similar bitterness qualities.<\/p>\n

Roasting is the key factor driving bitter taste in coffee beans. \u201cSo the stronger you roast the coffee, the more harsh it tends to get,\u201d Hofmann says, adding that prolonged roasting triggers a cascade of chemical reactions that lead to the formation of the most intense bitter compounds.<\/p>\n

Using advanced chromatography techniques and a human sensory panel trained to detect coffee bitterness, Hofmann and his associates found that coffee bitterness is due to two main classes of compounds: chlorogenic acid lactones and phenylindanes, both of which are antioxidants found in roasted coffee beans. The compounds are not present in green (raw) beans, the researchers note. Ironically, the lactones and the phenylindanes are derived from chlorogenic acid, which is not itself bitter.<\/p>\n

Chlorogenic acid lactones, which include about 10 different chemicals in coffee, are the dominant source of bitterness in light to medium roast brews. Phenylindanes, which are the chemical breakdown products of chlorogenic acid lactones, are found at higher levels in dark roasted coffee, including espresso. These chemicals exhibit a more lingering, harsh taste than their precursors, which helps explain why dark-roasted coffees are generally more bitter, Hofmann says.<\/p>\n

Perception of bitterness can also be influenced by how the coffee is brewed.. Espresso-type coffee, which is made using high pressure combined with high temperatures, tends to produce the highest levels of bitter compounds. While home-brewed coffee and standard coffee shop brews are relatively similar in their preparation methods, their perceived bitterness can vary considerably depending on the roasting degree of the beans, the amount of coffee used, and the variety of beans used.<\/p>\n

Some instant coffees are actually less bitter than regular coffee, Hofmann says. This is because their method of preparation, namely pressure extraction, degrades some of the bitter compounds. In some cases, as much as 30 to 40 percent fewer chlorogenic acid lactones are produced, leading to a reduced perception of bitterness, he says.<\/p>\n

\u201cNow that we\u2019ve clarified how the bitter compounds are formed, we\u2019re trying to find ways to reduce them,\u201d Hofmann says. He and his associates are currently exploring ways to specially process the raw beans after harvesting to reduce their potential for producing bitterness. They are also experimenting with different bean varieties in an effort to improve taste. But so far, none of these approaches\u2014details of which are being kept confidential by the researchers\u2014is ready for commercialization, he notes.<\/p>\n

What makes coffee bitter?<\/a>
\nOral Presentation, August 21, 2007
\nAmerican Chemical Society National Meeting
\nBoston, Mass.<\/p><\/blockquote>\n

<\/p>\n

\n

Learn more about Chromatography<\/strong>: What is Chromatography and How it Does it Work?<\/i><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Published with permission. Initially published in the IFT Weekly Newsletter, August 22, 2007 Why is Coffee So Bitter \u2013 it\u2019s not the Caffeine What makes coffee so bitter, aside from being constantly cast as a…<\/p>\n","protected":false},"author":20,"featured_media":6223,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[68,82,185,214,215,230,290,313,314,416,620,803,868,951,1096,1524],"class_list":["post-113","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-food-beverage","tag-american-chemical-society","tag-antioxidants","tag-bitter-coffee","tag-caffeinated","tag-caffeine","tag-caribou-coffee","tag-chromatography","tag-coffee","tag-coffee-beans","tag-decaffeinated","tag-folgers","tag-ift","tag-java","tag-latte","tag-mocha","tag-starbucks"],"yoast_head":"\nWhy is Coffee So Bitter? 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