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
16. February 2010 20:42
White tea is truly a pearl among the different varieties of tea. These teas are a specialty of the Chinese province Fujian. White tea is the most expensive, and this fact is not surprising because white tea is widely considered the most effective (health-giving). It contains a maximum amount of useful substances and vitamins, which are found in the other varieties of teas in smaller amounts due to fermentation process.
White tea is one of the rarest teas in the world: the buds are picked before they unfurl, which means the tea can only be plucked for a few weeks each spring only in the morning from 5 to 9 AM. White teas have a very strict procedure for the plucking and processing. The tea pickers are prohibited from eating spices, garlic, onions, and consuming alcohol, as well as other strong-fragrant foods in order not to contaminate the aroma of tea leaves. The unopened buds and two young leaves are plucked by hand then withered to allow natural drying. White tea is minimally processed, therefore contains the higher level of antioxidants. The main difference of white tea is that it leaves are not broken or twisted, which is why tea looks a little sloppy. The fermentation of white tea is a natural way without the use of any special technological innovations. In fact, the process of drying of white tea is the only process where manufacturers can somehow affect the final product. That is why the drying process is approached with special care.
High-quality white tea leaves remain whole after the drying process despite the fact that they become distorted, the leaves maintain maximum integrity. Another characteristic feature of good white tea is the presence of small silver fibers on the leaves.
White tea requires very careful handling. If you already shelled out for expensive and good product, try to brew it so as to preserve the maximum benefit and enjoy this drink. For brewing white tea, use water at a temperature ranging from 176 to 194 degrees F, and steep it not longer than 2-3 minutes. If water used is too hot it will not allow the unique aroma of white tea to unfold. White tea should be stored in a tin box, so there is no access to different odors, since it instantly absorbs all extraneous scents. The brewed liquid has lightly amber color with a slight greenish tint. It is very transparent with thin unique floral, slightly herbal flavor.
There are few traditions and rules imposed to the consumption of white teas. The fact that subtle and delicate taste of white tea is fairly weak, tea drinkers should not enjoy white tea after spicy, salty or astringent foods, because of strong food aftertaste. Therefore, white tea should be drunk by itself. For those who prefer to add a fruity accent to white tea, ESP Emporium offers an innovated White Grape Premium Tea blend. It is your turn to decide whether our choice was the correct one. Fresh juice from sun-ripened grapes, red berries and the blue/violet color of blossoms, set on a bed of rich green (China Pai Mu Tan, China Cui Min), invite you to simply enjoy this excellent blend.
White teas, regardless of grade offer great benefits to our body. They are rich in antioxidants and slow down skin aging process, prevent the emergence of malignant tumors. White tea also has an antiviral effect, strengthens the cardiovascular system, and reduces the risk of developing rheumatoid arthritis.