Showing posts with label oxygen. Show all posts
Showing posts with label oxygen. Show all posts

Friday, December 12, 2008

Green Tea & Caffeine

So you've heard that green tea is good for you, and have considered trying some out to see what the big fuss is all about. If you have checked out what is on the typical grocery store shelf, you most likely have seen green tea bags of various descriptions. Sitting amongst these is usually a decaffeinated type as well. If one wants green tea but at the same time does not want the caffeine, most people would assume all they need to do is go for the decaffeinated version. Unfortunately, it's not quite so simple. What most people are not aware of is that the decaffeination process pretty much ruins the major health benefits associated with green tea. There are numerous reasons for this, but to understand why you need to have an idea on how green tea is processed. It all has to do with oxygen.
Decaffeinated green tea is just about unheard of in Japan, home of the world's finest green teas. There really is no place in the processing where a decaffeination process would work and not ruin the tea. This processing involves steaming, rolling, and drying, and takes about three hours start to finish.

Although it comes from the exact same species of plant (Camellia Sinensis) as black tea, it is picked and then process immediately to prevent oxidation of the leaves. Green tea, however, is not like that. This gives black tea its unique taste. When you drink regular English tea, those leaves have been exposed to oxygen and fermented that way on purpose. That is from contact with the air, or more specifically, the oxygen in the air.

Notice how it starts to turn brown? Think about what an apple looks like after it's been cut and sitting on the counter for an hour.
Quite often, the second infusion is greener than the first, although it won't be quite as aromatic or tasty. Since nearly all of the caffeine is in the first infusion, getting a quality decaf green tea is going to be better than the best decaffeinated green tea out on the market. As much of a shame as it seems to be to dump the first infusion (which has the most taste and best aroma), rest assured that the 2nd infusion of a high quality loose leaf Japanese green tea, preferably from the first harvest. That said, if it's a caffeine free cup of quality green tea is as simple as brewing an infusion, dumping it, and then re-brewing.

That's slightly less than regular black tea just a fraction of the caffeine in coffee. No, it is possible, but first it's important to know that green tea does not have high caffeine content, only about 30mg per cup. So does that mean one cannot drink decaffeinated green tea?
Based out of Japan, in addition to offering a wealth of information on the health benefits of green tea, O-Cha.com offers a large selection of loose leaf green tea, matcha, and tea brewing supplies. Kevin Moore is the founder of O-Cha.com, one of the internet's first and largest websites dedicated to Japanese green tea.
http://www.o-cha.com
Contact him at
kevinrm@o-cha.com

Friday, October 10, 2008

Green Tea: What a Difference a Date Makes

However did you know that Green Tea has a fairly short shelf life, and to get the greatest benefits it should be drunk as quickly after picking as is possible? The object of consuming Green Tea is to derive the greatest health benefits that the brew has to offer.
The actual shelf life of Green Tea will generally be up to six months after harvesting, when exposed to open air.
Indeed there are certain varieties of Green Tea which will be deemed spoiled after four months from harvesting.
So freshness becomes a problem However with the popularity of Green Tea soaring worldwide it now travels perhaps many thousands of miles from the harvest site before it reaches the customer. Keeping Green Tea fresh for consumption in the countries in which it is harvested, although needing care is fairly simple as there is usually no great time-delay in transportation.
When transporting Green Tea on long journeys most companies, but not all, seal the tea in packages filled with a nitrogen gas, which replaces oxygen and prevents the Green Tea from oxidisation.
When sold in packages the Green Tea should be sealed in a bag from which the oxygen has been removed. The contents of the bag should then be used within two months so as to have the Green Tea at its freshest.
There is much difference between a Green Tea which has been exposed to air for much of its life.
You should always read the packaging before purchase to make sure of the harvest date of the Green Tea: the better providers have no problem in giving this information. Sometimes you take a risk in the purchase of your favourite flavour of Green Tea, in that some degradation has happened prior to your purchase due to the exposure to oxygen.
Remember, by purchasing the freshest you will be getting a greater helping of the wonderful benefits Green Tea has to offer.
Mike Linder is the author of the definitive guide to all green teas and their health benefits.
http://www.benefitsdrinkinggreentea.com

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