Tea: The Essence Of The Fragrance

by Steven Popec 29. April 2010 20:37

The fragrance of tea depends on the essential oils and tar substances that are contained in plants. Essential oils are complex mixture of substances that belong to the most diverse class of compounds which are soluble in organic solvents and possessing the ability to escape from water vapor. Overall the total content of essential oil is minimal; it is determined by only hundredths of a percent. For example, aromatic black tea contains about 0.02% of oil. Pure essential oil of fresh tea leaf is a green color with a strong fragrance of fresh greens. In the technological processing of tea leaf occurs the formation of a new aromatic substances that contribute to the specific flavor of the finished product. Thus, the composition of essential oil of green plants is different from the finished black tea. The substances that make up the oils can be divided into 4 main classes of compounds: acids, carbonyl compounds, alcohols and phenols. These volatile compounds found in tea are trace amounts - 0.01% of dry matter, but their role in the establishment of the tea flavor is tremendous. 
 
Some parts of the plant contain different amounts of volatile compounds, which, in turn, differ in their compositions. The maximum concentration of essential oil found in the tender stems and leaves. The top leaf with the growing bud and two next leaves are equivalent to the content of essential oil. Further down the stem, as general coarsening occurs, oil content decreases. Which explains why the top three leaves are the most vaulable for high quality tea. 
 
In the formation of the aroma of tea, the main role is played by aromatic aldehydes (Organic compound that has OH-group in its structure. They are used in organic synthesis as fragrances). In the composition of essential tea oils are vanilla, lavender, cinnamon aldehydes, etc. During the processing of tea leaves into black tea, the various fractions of volatile compounds undergo significant changes. The total content of these compounds increases most radically in the early stages of rolling. In the process of withering the relative content of components with higher boiling point reduces and low-boiling point, on the contrary, increases. 
 
Along with essential oils important role in creating a tea aroma played by various resinous substances - carriers of flavor. They are in a close chemical relation with essential oils and are a complex mixture of different classes of organic compounds. 
 
The content of tarry substances in tea leaves ranges on average from 3% to 6%. These substances are separated by several fractions, the most valuable of which is a neutral faction. It has a pleasant sweet floral aroma. In the process of technological treatment , the amount of this fraction in tea leaves increases by 40%. 
 
During the processing of tea leaves, the content of resinous substances decreases, indicating the result of oxidation. I.e. ratio: fresh leaves – 3.48%, withered leaves – 3.27%, after two hours of curling – 2.92%, semi-finished product – 2.35%. 
 
Through fragrance of tea, all the deficiencies that have arisen as a result of violations of technological regimens or improper storage of products, can easily be found. Disadvantages may include: acidity, mustiness, smell of the green, smoke and other uncharacteristic for tea scents. Most difficult to improve defect is acidity, which results in a violation of the fermentation process. Since in the processing of tea leaves, especially during the fermentation, occurs a reduction of Tannin. Therefore, the tea produced in violation of this process turns out with a bitter flavor and pale color of infusion. The cause of the smell of greenery is an infringement of withering, rolling, and fermentation. Such a tea has a mild flavor that the brew is a greenish color in the cup with a greenish ring on the surface and instead of the characteristic astringent taste; this product has a bitter taste. If there is excessive moisture in semi-finished product (more than 7.5%) tea is aging much faster. For extended storage. it gets the smell of dampness and can come in unsuitable conditions for consumption. 
 
In addition, it is worth noting that different varieties of tea, as well as different ways of brewing, have an imprint on the final quality of the drink

Great Tips For Preparing The Perfect Cup Of Tea

by Elena Popec 29. March 2010 21:46

There are numerous methods for brewing tea leaves. In Japanese tea ceremonies, powdered tea is whisked into green foam, in Mongolian, they reduced tea leaves dust by boiling with salted milk…Western tea lovers follow the Chinese way of brewing tea leaves in hot water. This way seems very simple, but there are several essential tips that are critical to a good cup of tea.

1. Make sure you use good quality cold water
2. Your kettle and teapot need to be clean
3. Use the correct amount of tea leaves
4. Use the correct amount of water at proper temperature
5. Make sure tea is steeped for the right length of time
6. Use proper storage for tea leaves

Use good quality cold water

Water that is used to make tea has a large influence on the tea taste. Water composition, chalk content, mineral content and hardness differ from region to region and influence the taste experience, greatly. For the best taste results, use good-tasting water.  Only use fresh water which was not already cooked previously. Bottled spring or filtered waters are ideal for this purpose, find the kind you like. If using tap water, make sure it runs for couple minutes before poured in the kettle. Tap water lacks oxygen when it sits in water pipes for hours. Do not use distilled water.
 
Kettle and teapot need to be clean
Tea should always be prepared in a specific container, such as a teapot made out of glass or ceramics. Always preheat your porcelain, ceramics or glass with hot water. The best water and the finest tea can be easily destroyed if the kettle or teapot is not clean. A brownish residue on the inside of teapot builds up after every brewing and needs to be taken care of; otherwise it will add a bitter taste to freshly brewed tea. So, just rinsing a teapot does not take care of the problem. Use a small amount of detergent while washing and wipe out the inside with soft cloth or sponge. Make sure the teapot is rinsed off thoroughly after washing, otherwise you may add extra “flavor” to the delicate bouquet of brewing tea leaves. Even the kettle is used only to boil water; it needs to be washed occasionally due to mineral deposits build up. Iron teapots are especially suitable for green tea and oolong tea. In Japan, these pots are only used to keep the water hot for the tea ceremony. For Europeans, the Japanese have enameled the pots on the inside so that they can be used to brew tea. Iron pots are very stylish and are almost indestructible.

Use the correct amount of tea leaves
I have the easiest solution – read suggested instruction but if you like to experiment, here are some general tips to follow:

1. Use a tea measuring spoon. The decorative tea measuring spoons are available in many different forms and decors and determine the amount of tea needed for one cup. Particularly the longer spoons represent a good aid to reach the tea in the deep tea tins.
2. Use one teaspoon of loose leaf tea per each serving (6oz cup), 1-2 level teaspoon of herb blends and Rooibos, one heaped teaspoon of fruit blends;
3. After the amount of tea leaves is measured and placed in the teapot, add hot water;
4. Use tea strainers or tea filters while steeping. It will allow removing tea leaves easily when brewing process is done.

Use the correct amount of water at proper temperature
Each tea variety requires its unique treatment with respect to brewing. Most tea companies provide a suggested instruction on the package that refers to cup of tea being 6oz. The temperature of water varies depending on type of tea. Suitable thermometers for taking the appropriate water temperature are available.

1. Black and Oolong Tea requires fully boiling water 203-212 F;
2. Green and White Tea steeps best at 176-194 F, first stage of boiling also called “string of pearls”, when small air bubbles rising to the surface and water is starting to steam.

Right temperature will allow the delicate bouquet of tea composition to unfold fully, presenting its aroma.

Tea should be steeped for the correct length of time
The length of time depends on specifics of brewing leaves which need adequate time to open. White and Green tea requires 2 to 3 minutes due to being unfermented. Infuse the tea and let sit for 2 minutes. Many green tea drinkers also start by infusing half a cup of green tea with hot water for one minute before sieving it. Then the same tea is brewed again. This way, many of the bitter substances are eliminated.

Fully fermented black tea steeps longer 4 to 5 minutes. Pour the bubbly-hot water over the tea and let sit for 3 to 5 minutes. Note: 3 minutes for an energizing result and up to 5 minutes (and a little less tea) for a more calming effect. Stir the infusion once and then pour it over a sieve or tea filter. The brewing time also depends on the size of leaf, the bigger the leaf the longer infusion time. Do not let tea brew too long, otherwise it will become bitter and taste will suffer.
 
When it comes to fruit, herb and Rooibos tea, you do not have to worry. Due to being naturally decaffeinated, these tisanes need about 10 minutes on average to brew and will not go bitter.

There is a "Perfect Tea Hourglass" available to keep to correct time.

Proper storage for tea leaves

As all products, tea leaves have an expiration date. Although each type of tea has a different shelf life, it’s best to use tea within six month since day of purchase. Green and white tea is the most perishable due to short fermentation process. These types of tea need to be consumed in year of harvest. Black and Oolong retain their properties for several years. Pu-Erh gets only better with time. However, tea should be kept away from heat, moisture and sunlight. In order to preserve freshness tea should be stored in cool, dry, dark place in tea tin or ceramic container. Tins in various sizes are ideal for the storage of loose tea. The sensitive teas are well-protected against smell and light effects. The market offers many different decors that fit each tea character.

Now, when you know all the tricks, let Tea Party begin!

 

 

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