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How is caffeine removed from decaf coffee? - BBC Science Focus Magazine
Removing caffeine from coffee
Coffee beans are first softened in hot water or steam. Then caffeine is dissolved from the beans by using a solvent such as methylene chloride, ethyl acetate, or a gentler solvent such as water itself.
Liquid carbon dioxide is a much more expensive alternative, but has the added advantage that it does not remove the flavour molecules.
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SIMILAR ARTICLES & IDEAS:
Our Blood Types
Human beings have four major blood types, A, B, AB and O.
Blood cells, like all cells, are covered with molecules called ‘antigens', which depend on our genes. ...
The Most Common Antigens
Identified by Dr Karl Landsteiner in 1901, the most common antigens are A and B, and a person with type O blood has neither of the antigens, while some have both of them (Type AB).
Another antigen called RhD was discovered in 1937.
Currently, we have 36 systems to categorize blood types and 346 different antigens, whose exact purpose still remains unknown.
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Key Ideas
Coffee in moderation
Coffee was once believed to be a possible carcinogen. However, the evidence is consistent that coffee in moderation is associated with a lower risk of mortality.
Research found moderate ...
The way coffee is prepared matters
- Roasting reduces the number of chlorogenic acids, but other antioxidant compounds are formed.
- Instant coffee may not have the same health benefits.
- The oil in boiled coffee has cafestol and kahweol, compounds known to raise LDL, the bad cholesterol, and slightly lower HDL, the good cholesterol. However, the clinical significance of such small increases in cholesterol may be questionable.
Coffee and caffeine
- A typical 12-ounce serving of drip coffee has 200 milligrams of caffeine.
- Instant coffee has 140 milligrams of caffeine.
- Espresso has the highest concentration of caffeine, 70 milligrams per one-ounce shot, but is consumed in smaller quantities.
- Brewed decaf has caffeine too - about 8 milligrams.
- Some people have a genetic variant that slows their metabolism for caffeine and keeps them awake deep into the night.
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Key Ideas
Caffeine worsens your anxiety
Drinks such as coffee, sodas, energy drinks, tea, and chocolate, all contain caffeine.
People who have anxiety disorders and panic disorders are generally more sensitive to the effects of ...
Jolts of energy from caffeine
The explanation behind the surge of energy you get from drinking coffee is: caffeine blocks the receptors that are meant to be for adenosine.
Adenosine plays a number of bodily functions, but during our bodies' waking hours it builds up in the receptors which causes us to feel sleepy and less alert. So, when we intake caffeinated drinks, the caffeine blocks the receptors that are meant for the adenosine to build up and also could trigger the release of adrenaline.
Tracking your caffeine intake
According to the FDA, 400 milligrams of coffee is deemed to have any harmful effects on healthy adults. However, those who are pregnant and suffer from anxiety and panic disorders should drink no more than 200 milligrams per day.
If you believe that caffeine is worsening your anxiety, keep a diary with you at all times to keep track of your caffeine intake and anxiety symptoms and log them. Check your logs to see if there are any patterns that show up.