:: Dealing With Decaf :: (#)
„Flavour-charged water circulation is unique to the Swiss Water process and prevents most of the flavour compounds within the beans from dissolving during decaffeination, whilst at the same time the caffeine from the beans is absorbed into the surrounding liquid." So far, so wet. "We then use a series of activated carbon filters to remove all the caffeine from the flavour-charged water, and it can be used again for the next batch of beans. It's a remarkably efficient process, and an expensive one, not least because of the strict caffeine monitoring involved." So, how are other coffees decaffeinated, then? "Typically, coffee is decaffeinated through a variety of more chemically-reliant, severe processes involving substances like Methylene Chloride, Supercritical Carbon Dioxide or Ethyl Acetate.“
http://www.matthewalgie.com/find_out/ lab-dealing.html - Cached
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CoffeeGeek - Espresso: Espresso Blends, Black Cat Hi Test/Decaf
„I have always assumed that the gooey stuff on the outside of decaf beans arises because of the decaffeination process. This I imagined to be dissolving the caffeine and other stuff with a solvent (hopefully water, but not always), then removing the caffeine from the solvent, putting back by the liquid solvent with all the other stuff, and evaporating the solvent, so that the other stuff is now stuck to the outside of the bean.“
http://www.coffeegeek.com/forums/espresso/blends/ 17976
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Tea & Coffee 03/02 - Decaf Dialogue
„In addition, the added costs of shipping to and from decaffeination facilities makes the decaffeinator’s cost structure vulnerable to increases in transportation costs. Further, delays in custom’s entries, exacerbated by the tragic events of 9/11, have increased the costs of financing and made the costs of “pipeline fill” for roasters vis-a-vis decaf coffee somewhat greater. All of this adds up to more pressure on the decaffeinator than is in the tank of a supercritical carbon dioxide processor, and that’s a lot.“
http://www.teaandcoffee.net/0302/coffee.htm
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Caffeine and The Bean (INeedCoffee.com)
„The first is called the Swiss Water Process method. Decaf coffee made with this method can be found at most gourmet coffee shops, organic food grocery stores. The other decaffeination processes use some sort of a chemical solvent. In this article, I'll explain the essential aspects of the chemical removal process then I'll discuss a specific variation of the chemical process termed the Super Critical Carbon Dioxide method.“
http://www.ineedcoffee.com/99/06/decaf/
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BBC NEWS | Science/Nature | GM decaf coffee plant created
„But according to the trade body, the International Coffee Organisation (ICO), several major questions remain - not least over how the cost of the GM technology will compare with the industrial decaffeination process used currently. Bitter battle Pablo Dubois, from the ICO, said: "The global market for coffee is about $70bn a year, and decaf makes up about 10% of that. "The main issue would be the economics - is it going to be cheaper to buy GM seeds and grow them than to decaffeinate coffee as we do now?" Other researchers, some in commercial companies, have been working on GM decaf for several years. But Professor Alan Crozier, from the biochemistry department in Glasgow University, UK, says this is the first credible evidence that the GM decaffeination concept actually works.“
http://news.bbc.co.uk/2/low/science/nature/ 3002112.stm
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„Why yes, as a matter of fact, you do. When you pull out your supply of green decaf beans the physical differences between regular and decaffeinated beans is striking. Compared to the unprocessed beans, which are plump and green, the decaf appear stunted: and shriveled, with a brownish tint, almost as if they were already roasted. What path have these beans traveled to lose that component called caffeine, and take on this striking difference?“
http://www.aboutcoffee.net/2002/08/ what-is-decaf-anyway.html
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