The EffECT of DiffERENT Gas Treatments on the Content of GABA in

Anaerobic fermentation is the key step of manufacturing GABA tea However, it is important to know what kind of gas should replace oxygen . Tsushida et al . 1 have Anaerobic treatment (5-10 hr) Panning (or steaming) Rolling - Drying -> GABA green tea (GABA sencha) -> Solar withering -> Indoor sitting and shaking Anaerobic treatment (5-10 hr) Panning Rolling - Drying GABA oolong tea Withering - Anaerobic treatment (5-10 hr)-> Rolling - Fermentation Drying GABA black tea FIGURE 4.2 Basic...

GABA and Hypertension

It has been proposed that GABA plays an important role in the modulation of cardiovascular function16 by acting in not only the CNS but also peripheral tissues . 1718 Indeed, GABA has been reported to reduce blood pressure in experimental animals2 and humans3 following its systemic or central administration, and it has been suggested that the depressor effect induced by systemic administration of GABA619 is due to the blockade of sympathetic ganglia Studies have evidenced that GABA plays an...

Takashi Tanaka Yosuke Matsuo and Isao Kouno Contents

5 . 1 5 . 2 Model Fermentation 5 . 3 Production and Oxidation of 5 .4 Oxidation of Catechol-Type 5 . 5 Oxidation of Pyrogallol-Type Catechins and Formation of Theasinensins. . . .66 5 . 6 Polyphenol with a Theanine Strecker Aldehyde 5 .7 Another Pathway for Benzotropolone 5 . 8 Why Are Black Tea Polyphenols So Tea is made by processing the leaves of the tea tree Camellia sinensis, which originated in the southern areas of Yunnan province in China, and is now spread throughout the world . This...

Contributors

School of Biological Sciences University of Hong Kong Hong Kong, China E-mail h0235211 hkusua.hku.hk School of Biological Sciences University of Hong Kong Hong Kong, China E-mail sfchen hkusua hku hk The Chinese Art of Tea Craft Union Tainan, Taiwan Institute of Biochemistry College of Medicine National Taiwan University Taipei, Taiwan E-mail jklin ha .mc .ntu . edu . tw School of Biological Sciences University of Hong Kong Hong Kong, China E-mail jfchao hkusua hku hk Department of Food Science...

Manufacturing Of Puerh

The good quality of pu-erh tea comes from large tea leaves from Camellia sinensis O . kuntze var. assamica Kitamura . Some pu-erh teas are also made from other species with small leaves, such as Camellia sinenesis Linn . According to the shapes of pu-erh tea, most products in the market can be classified into two categories loose tea and pressed tea. The loose tea is the dried product of pu-erh tea in its original curled strip shape, while pressed tea is made by pressing the loose tea into a...

Chemicals in White Hair

White hair is the symbol for Silver Needle and is also important for its color and taste quality. Results showed that white hair contains significant amounts of amino The content of carbohydrates during white tea withering The content of carbohydrates during white tea withering Source Chen, C . 1984. Theory in tea processing, 51-52, 205-17. Shanghai Shanghai Science and Technology Press . With permission . Source Chen, C . 1984. Theory in tea processing, 51-52, 205-17. Shanghai Shanghai Science...

The Basic Procedure of MANUfACTURiNG GABA

Anaerobic treatment is the key step for manufacturing GABA tea The basic procedures for manufacturing GABA tea with different degrees of fermentation are shown in figure 4 . 2 .93 To prevent the loss of GABA produced by anaerobic fermentation, the processes of pan blanching, rolling, and drying have to be carried out right after anaerobic fermentation in order to fix the content of GABA in the resultant tea. For fermented-type GABA tea such as oolong and black teas, anaerobic fermentation must...

The Manufacturing Of Gaba

Concerning the quality of GABA tea, the content of GABA in GABA tea should be greater than 150 mg 100 g of product . The higher the amount of GABA, the better the quality of the GABA tea will be Therefore, how to increase the amount of GABA in tea is an essential and important task FIGURE 4.1 The pathway for the formation of GABA in tea. From Shelp, B . J . , McLean, M . D. , and Bown, A . W. 1999. Metabolism and functions of y-aminobutyric acid. Trends Plant Sci. 4 446-52. With permission .

Antimicrobial Activity

A recent study showed that white tea has better antimicrobial function than green tea. White tea extract WTE may have prophylactic applications in retarding growth of bacteria that cause Staphylococcus infections, Streptococcus infections, pneumonia, and dental caries 25 White tea is very effective in inactivating bacterial viruses Results obtained with a bacterial virus suggest that WTE may have an antiviral effect on human pathogenic viruses . Studies have also indicated that WTE has an...

Conclusions

GABA is important for health, and its content decreases as we get older In order to avoid disease, we need to consume GABA . It has been found that fermented soybean, mulberry leaf, turtle, germinated unpolished rice, yogurt, and GABA tea are rich in GABA Among them, naturally produced GABA tea is the richest source of GABA In addition, GABA tea is readily available, and drinking GABA tea has no side effects Blood pressure and heart rate in SHR with different treatments Systolic pressure mmHg 2...

Inhibition of ACE activity by the main components of Gabaron tea in vitro

Components Concentration mM ACE activity Inhibition Source Lin, Z. and Omori, M. 2001. Effects of Gabaron tea components on angiotensin I-converting enzyme activity in rat . In Proceedings of the 2001 International Conference on O-CHA tea Culture and Science, Shizuoka, Japan, 81-84 . With permission . a GHB Y-Hydroxybutyric acid . investigated for comparison . Using 28 green teas and 28 GABA teas as material, moisture content, Hunter L, a, and b values, phenolic compounds, and amino acids,...

Microwave Irradiation

Shiraki107 investigated the accumulation of GABA in fresh tea leaves by means of microwave and infrared irradiation It was found that the amount of GABA in the semifermented tea with fresh tea leaves irradiated both by microwave and infrared was higher than that in the ordinary green tea. Microwave irradiation caused the amount 167-202 mg 100 g of GABA and alanine to increase, while the amount of aspartic and glutamic acids decreased in the resultant tea There was a tendency for the amount of...

Addition of Sodium Glutamate Solution

Nesumi105 reported a method to increase the GABA content in manufactured tea by soaking fresh tea leaves in sodium glutamate solution combined with infrared irradiation . The GABA content could increase to 2 . 89 mg g and 2 . 81 mg g for spring and summer teas, respectively, after soaking in water for 3 hr and treating with infrared irradiation, as compared with the increases of 1 . 6 mg g and 1 .43 mg g for spring and summer teas, respectively, after soaking in water for 3 hr but with no...

The Biological Functions Of Gaba

Functions Karel

The most special characteristic of GABA tea is not having the original biological functions of tea, but having the functions of blood pressure moderation . 111 Although the catechins in tea have good benefits for reducing blood pressure, Hara et al . in 1987112 demonstrated that the mechanism for reducing blood pressure by catechins was due to their inhibition of angiotensin I converting enzyme ACE activity. For GABA tea, the biological function of blood pressure moderation was even more...

Green Tea Consumption

In 2005, global green tea production increased to 883.9 thousand tons, which accounted for 25.23 of global tea production . FAO8 projected that world green tea production would grow at a faster rate than black tea by 2 . 0 annually, to reach 1097.7 thousand tons by 2016 . Apart from being the largest tea producer, surpassing India in 2005, China is also the largest green tea producer and exporter, contributing 78 . 18 of global green tea production and 88.78 of global green tea exports in 2005...

Green Tea Manufacturing

Although different green teas may be produced by different processing techniques, the general green tea processing is achieved as follows fresh tea leaves plucked Green tea Fresh tea leaves- gt Fixed- gt Rolled- gt Dried steamed or pan-fried to inactivate oxidase Yellow tea Fresh tea leaves gt Fixed gt Rolled gt Yellowed gt Dried piled and smothered to auto-oxidize Dark tea Fresh tea leaves gt Fixed gt Rolled- gt Pile fermented gt Dried oxidized by the oxidases of resident microbes White tea...

Tea Consumption

Tea is a popular nonalcoholic healthy beverage around the world Its discovery dates back to an ancient Chinese legend that Chinese emperor Shen Nung in 2737 b . c . was boiling water under a wild tree and a few tea leaves fell into the water, which gave a refreshing, revitalizing brewing From that time, tea was used as an herbal medicine and chronically evolved to a healthy beverage Prior to the middle of the nineteenth century, all teas consumed in the West were produced in China At the end of...

Effect of green and Gabaron teas on blood pressure level in SHR and Dahl S rats dosed with saline

CE-2 containing 5 saline with green tea 167 . 4 5 .1 219 1 10 6 51 7 7 9 cE-2 containing 5 saline with Gabaron tea 168 . 6 5 . 4 217 .1 18 .7 48 5 6 7 Initial 9 weeks old 4 weeks later Difference in blood pressure mmHg 28 days Dahl S Initial 9 weeks old 153. 8 11. 8 153.7 8. 3 153 . 7 7 .4 153. 8 7 .6 6 weeks later 165 .4 3.5 191.4 16.0 177. 8 3.1 176. 8 6.7 Difference in blood 11. 6 7.7 37.7 7.2 24.1 5.3 23.0 7 . 2 pressure mmHg 42 days Source Lin, Z. , Saito, H . , Omori, M. , Inomata, T. ,...

Black Tea Manufacturing

Unlike the enzyme inactivation process of green tea, the enzyme activities are completely utilized in black tea processing to form the pigments theaflavin and thearubigin Although the processing methods vary with the producing regions, the general black tea processing is fresh tea leaves plucked withered rolled fermented dried . 2 Among those four steps, the fermentation process is crucial to the quality of the final black tea product, which is predominated with the oxidation of catechins and...