In daily study and work life, everyone has dealt with papers. A thesis is an article to discuss or study some problems. In order to make it easier and more convenient for you to write your paper, here are the tea efficacy papers I collected for your reference, hoping to help friends in need.

Efficacy of tea paper 1 abstract

With the development of science and technology, people know more and more about tea, from composition analysis to efficacy analysis to extraction and preparation. In recent years, tea extract has been used in food processing, chemical industry, medicine and other fields.

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Functional components of tea

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Tea is a traditional drink in China with a history of thousands of years. Today, tea is still widely loved by Chinese and foreign people and has become a popular drink. In addition to its unique taste and culture, another reason why tea is popular is that its health care function has been gradually discovered and valued. With the development of science and technology, people know more and more about tea, from composition analysis to efficacy analysis to extraction and preparation. In recent years, tea extract has been used in food processing, chemical industry, medicine and other fields. This paper summarizes, introduces and analyzes the related data and known functional components of tea.

1, protein

Tea contains a large amount of protein, accounting for about 15%-23% of the dry weight of tea. In the process of tea processing, tea protein can combine with tea tannin and solidify after heating. Water-soluble proteins only account for 1%-2% of the total proteins, and most of them are water-insoluble proteins, mainly including glutenin (about 80%), gliadin (about 13%), albumin (about 3%) and globulin (65433). Because more than 80% of tea protein is glutenin with relatively high molecular weight, glutenin molecules are condensed by disulfide bonds and hydrophobic groups, so it is difficult to be dissolved. Therefore, in the normal process of drinking tea, tea protein does not have much nutritional significance to human body, and most of protein will remain in tea residue.

According to a lot of scientific research, tea protein has health care function. 1994 Professor Donglian Cai from the Nutrition Department of Changhai Hospital has done a lot of animal and human experiments, which proves that tea protein has certain health care function [1]. In the study on the anti-mutagenic effect of tea protein (such as BU-ABASA), it was found that tea protein has a protective effect on the mutagenic effect caused by radiation. In 2005, Lively et al. [2] found that this kind of water-insoluble tea in protein has obvious hypolipidemic effect, and has certain preventive effect on atherosclerosis and coronary heart disease.

2. Amino acids

Tea contains 26 kinds of amino acids, 6 of which are non-protein amino acids. Glutamate and aspartic acid are important amino acids in tea, with the highest content in tea, and they are important components that constitute the fresh fragrance of tea.

Theanine is the main part of free amino acids in tea, which is abundant in tea and has caramel taste and umami taste similar to monosodium glutamate. Animal experiments show that theanine can obviously reduce the systolic blood pressure, diastolic blood pressure and average blood pressure of rats. Theanine was added to the tea beverage produced by Kirin Company in Japan. Kobayashi K and others orally administered theanine aqueous solution (50-200mg/mL) to volunteers, and the results showed that theanine could enhance the intensity of alpha wave in brain, make people relax and improve their memory [4]. After years of research, the extraction and synthesis technology of theanine has been quite mature, mainly including chemical synthesis, microbial fermentation preparation and plant tissue culture, and has been put into industrial production and application.

γ -aminobutyric acid is also an amino acid with multiple functions contained in tea. Through anaerobic culture, dry tea with the content as high as 150mg/ 100g can be obtained. This amino acid is an important inhibitory neurotransmitter, which can play a certain analgesic role. Intake of γ -aminobutyric acid can prevent arteriosclerosis and regulate arrhythmia. Can systematically participate in the regulation of cardiovascular function in mammals [5] At present, there are antihypertensive health tea products rich in γ -aminobutyric acid on the market.

3. sugar

The sugar content of tea is 20-25%, mainly cellulose, pectin, starch, glucose and fructose. Only 4-5% of them can be dissolved in tea soup, and monosaccharide and disaccharide are the main components of tea soluble sugar. Drinking tea regularly will not make people fat, but it can meet 7%- 10% of the daily calories needed by the human body.

Tea polysaccharide consists of saccharides, protein, pectin and ash, among which saccharides are arabinose, xylose, fucose, glucose and galactose, and the relative molecular weight is about 107000. It is soluble in boiling water, but insoluble in high concentration organic solvents, such as ethanol, acetone, ethyl acetate and n-butanol. The thermal stability is poor, and tea polysaccharide will be partially hydrolyzed under high temperature or excessive acid and alkali conditions. It is considered that this water-soluble complex polysaccharide in tea can effectively reduce the blood sugar content; It can reduce plasma total cholesterol, resist the formation of experimental hypercholesterolemia, reduce plasma total cholesterol, triglyceride, low-density lipoprotein and neutral fat, and increase high-density lipoprotein. In addition, tea polysaccharide can also combine with lipoprotein lipase to promote lipoprotein lipase to enter the blood from the arterial wall, thus playing an anti-atherosclerosis role.

4. Tea polyphenols

Tea polyphenols account for 20%-35% of the dry weight of tea shoots, and are composed of about 30 phenolic substances, commonly known as tea polyphenols. According to its chemical structure, it can be divided into four categories: catechins, flavonoids and flavonols, anthocyanins and anthocyanins, phenolic acids and peptides. Tea polyphenols is a natural antioxidant, which has been widely used in food industry, medicine and other fields for a long time. It is one of the earliest substances extracted and processed from tea. Its antioxidant function is mainly to scavenge free radicals, and it can also be used as a related enzyme to generate free radicals, complex metal ions and indirectly scavenge free radicals.

5. minerals

Tea is rich in minerals. Among them, there are about 27 kinds of inorganic mineral elements, including phosphorus, potassium, sulfur, magnesium, manganese, fluorine, aluminum, calcium, sodium, iron, copper, zinc and selenium. Mineral elements existing in inorganic state are not ideal for human body to absorb and utilize, and some even contain toxicity, while mineral elements in tea mostly exist in organic state, which is beneficial for human body to absorb.

6. Vitamins

So far, it has been found that tea contains 10 vitamins, mainly water-soluble B vitamins and vitamin C, as well as fat-soluble vitamins A, D, E and K. By drinking tea every day, the body can supplement vitamins well.

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Practice has proved that tea contains a variety of ingredients beneficial to human body, which is worth popularizing to the general public and drinking daily. Besides tasting elegant tea, it has a positive impact on health. In view of the functional components of tea, we can continue to have a deeper understanding of it in the future, so that tea can play a greater role in human beings. From the economic point of view, China is a big country producing tea, and the surplus broken tea, tea powder and tea residue produced in large quantities are also available resources rich in effective components. Through the extraction and application of its components, greater economic benefits will be obtained.

refer to

[1] Shanghai Bioengineering Research Center, Chinese Academy of Sciences. Tea protein [J]. Technology and market, 1999, 10: 23.

[2] Study on the Hypolipidemic Effect of Active Insoluble Tea Protein [J]. Tea Science, 2005,25 (2): 95-99.

Gao Xiaohong, Yuan Hua, Yu Zongyuan. Research progress of theanine [J]. Chemistry and Bioengineering, 2004,21(1): 7-9.

[4] Cui Deshan editor. Function and application of L- theanine [J]. Japan/Food and Science. 1999 (2): 86-89.

Jia Hongyun, Jiang, et al. Regulation of γ -aminobutyric acid on cardiovascular activities [J]. Journal of Ningxia Medical College,1998,20 (1): 87-89.

The efficacy of tea abstract 2: The benefits of drinking tea are well known. In our country, many people regard drinking tea properly as a necessary means of self-cultivation and health care. However, most people think it is not appropriate to drink tea after physical exercise. In fact, drinking tea properly has many benefits for restoring physical function after physical exercise. This paper expounds the characteristics of human function after physical exercise and the chemical composition of tea, and analyzes the effect of moderate tea drinking on the recovery of human function after physical exercise.

Keywords: physical exercise; Physical function; Tea; function

Introduction: After physical exercise, a series of changes will take place in people's physical functions, such as the improvement of the excitability of the nervous system, the acceleration of body metabolism, the increase of body temperature, and the intensification of the movement of internal organs. Its external manifestations mainly include increased heart rate and pulse, increased blood pressure, increased pulmonary oxygen demand, increased sweating and frequent urination. The effective components in tea include protein, vitamins, carbohydrates and other organic substances, as well as inorganic minerals such as phosphorus and potassium. This paper introduces the changes of human body function in physical exercise, and then analyzes in detail the functions of different chemical components in tea in restoring human body function.

1 Characteristics of physical function after exercise

With the progress of the times and the improvement of people's material living standards, the demand for health is getting stronger and stronger, and more and more people adjust their physical functions through physical exercise. After physical exercise, people's physical function tends to decline due to the loss of energy, and the most direct feeling is fatigue, which is mainly reflected in three aspects: muscle fatigue, nerve fatigue and visceral fatigue.

Muscle fatigue: Research shows that after physical exercise, due to the accumulation of acetylcholine in the posterior membrane of neuromuscular junction, the muscle contraction speed slows down, there is no normal alternation of excitement and relaxation, and even muscle pain and uncoordinated movements appear.

Nerve fatigue: The fatigue of human nervous system mostly comes from the fatigue of the body, that is to say, it is the fatigue of the body that leads to the fatigue of the nervous system. After physical exercise, people are usually slow-witted and difficult to concentrate.

Visceral fatigue: Physical exercise will have an impact on human internal organs, such as heart, lungs and gastrointestinal tract. , mainly manifested in the enhanced systolic function of the heart and the accelerated heartbeat; The increase of pulmonary oxygen demand leads to shortness of breath; Gastrointestinal contraction function is enhanced, and gastrointestinal discomfort and even convulsions may occur.

Two main chemical constituents in tea

The health care function of tea is mainly reflected in its chemical composition, which is composed of a large number of organic substances and some inorganic minerals.

Studies show that the main organic compounds in tea are protein, lipids, carbohydrates, amino acids, alkaloids, tea polyphenols, organic acids, pigments, aroma components, vitamins and so on. Among them, leaf protein accounts for 20%-30% of nutrients; There are many kinds of amino acids, especially theanine unique to tea tree is the most valuable, most of which are essential amino acids for human body, accounting for about1.5%-4% of the total components; Carbohydrate accounts for 25%-30% of the total components. In addition to these common nutrients, tea also has one of the most important nutrients-10%-25% tea polyphenols, which plays an important role in improving human antioxidant function, scavenging free radicals, reducing blood lipid and blood pressure.

Besides organic components, tea is also rich in minerals, including phosphorus, potassium, sulfur, magnesium, manganese, fluorine, aluminum, calcium, sodium, iron, copper, zinc and selenium. Mineral elements are important substances to maintain human metabolism, and the lack of any one will lead to imbalance of human metabolism. For example, calcium deficiency can lead to imperfect bone and tooth development and limb cramps; Phosphorus is the main component of cell membrane; Lack of magnesium will cause problems in our digestive system; Potassium is an important element for regulating body fluid balance; Chloride is mainly used to participate in the secretion of various glands, such as gastric juice and saliva; Iron is a component of hemoglobin in blood, and iron deficiency can lead to anemia. These minerals needed by human body can be obtained from proper tea drinking.

3. The effect of drinking tea properly on restoring human function after exercise

From the above analysis, we know that after physical exercise, people's physical function will be weakened. If they don't get rid of fatigue and restore their physical function in time, it will affect their normal study and life, and even their health, which obviously runs counter to the original intention of people to exercise. Studies have proved that tea plays an important role in restoring physical function. Here we will use the classification method to explain the effect of drinking tea properly after exercise on restoring physical function.

3. 1 moisture

After physical exercise, whether you drink tea or water, it is to supplement the water necessary for human metabolism. Water is the foundation of all things, and supplementing water is the first step to restore body function. People sweat a lot during physical exercise. After the body loses a lot of water, the concentration of salt in the blood will increase, increasing the burden of cardiovascular operation. Therefore, if you don't replenish water in time, it will affect the operation of cardiovascular function. At the same time, with the loss of sweat, electrolytes such as sodium and potassium in the human body will also be lost, which will make the body's anti-stress imbalance. Therefore, drinking tea properly will not only replenish the water needed by human body's operation, but also reduce the burden of cardiovascular operation. Minerals such as sodium and potassium in tea will also replenish the electrolytes needed by human body in time, helping the pressure in human body to restore balance.

3.2 protein and amino acids

Although the soluble protein in tea soup only accounts for 65,438+0%-2% of its total protein, this part of protein can supplement the human demand for protein, especially after aerobic exercise; Amino acids are the main components of protein, and tea is rich in amino acids, such as theanine, glutamic acid, aspartic acid, phenylalanine, threonine and so on. All kinds of sports drinks popular in the market now attract customers because they can supplement various amino acids needed by human body after exercise. After physical exercise, drinking tea properly can also play a role in supplementing amino acids, such as: theanine helps to restore gastrointestinal function; Leucine helps to relieve anxiety and tension and reduce the fatigue of nervous system; Valine is beneficial to the recovery of liver function and health.

3.3 Alkaloids

The alkaloids in tea mainly include caffeine, theobromine and theophylline, among which caffeine has the most content. Caffeine is easily soluble in water and is one of the important substances that form the taste of tea soup. It is generally believed that the main reason for not drinking tea after physical exercise is that tea contains caffeine, which is a substance that can cause physical excitement. Drinking caffeine after exercise will inevitably increase the burden on the heart. This view is obviously too one-sided. It doesn't see the role of caffeine in restoring human function. After physical exercise, moderate intake of caffeine is beneficial to refreshing, relieving the fatigue of muscles and nervous system, promoting the normal operation of blood circulation system and strengthening the gastrointestinal digestive system.

3.4 sugar

Sugar is an important nutrient for human body and provides energy for our daily life. After physical exercise, sugar supplementation is conducive to restoring physical strength and relieving fatigue. The main sugars in tea are monosaccharide, disaccharide and polysaccharide, among which monosaccharide and disaccharide are soluble sugars, which are easily absorbed by human body. Because when we are engaged in long-distance running, marathon running, long-distance swimming, skiing and other endurance events. The consumption of sugar is very high. At this time, proper drinking tea can supplement sugar in time, avoid the harm caused by excessive fatigue to the human body, and also effectively prevent hypoglycemia and dizziness.

3.5 vitamins

Tea is rich in vitamins, among which water-soluble vitamins mainly include vitamin C, B vitamins, vitamin P and inositol. These vitamins are soluble in tea soup and are easily absorbed by the human body after drinking, which plays an important role in restoring body function. Vitamin c will be lost with body fluids after physical exercise, and drinking tea can supplement vitamin c in time; Vitamin B 1 is helpful to convert glucose into heat in the body and accelerate the consumption and utilization of liver sugar during exercise; Vitamin B6 is related to protein's metabolism, and supplementing B 1 is beneficial to relieve muscle fatigue after exercise. Vitamin B 12 can promote metabolism, improve the metabolic utilization rate of fat, sugar and protein, and is beneficial to the recovery of body functions as soon as possible.

3.6 minerals

Minerals, also known as inorganic salts, are essential elements that constitute human tissues and maintain normal physiological functions. Tea contains a large number of water-soluble minerals, of which potassium is the most abundant, followed by phosphorus, sodium, sulfur, calcium, magnesium, manganese and so on. In addition, it also contains many trace elements such as copper, zinc, boron and selenium. In the process of physical exercise, people will take away mineral elements through sweating and breathing. Because these minerals cannot be synthesized by themselves in the human body, they must be supplemented through external channels, and drinking tea properly can just meet the diversified needs of minerals after exercise.

4 Precautions for drinking tea properly after exercise

Because after physical exercise, our physical function has changed relative to our normal physical state, so we should pay special attention to drinking tea after exercise. To drink tea healthily, we must follow the three principles of moderation, timeliness and science.

The so-called moderation means to control the intake of tea drinks when drinking tea, and remember to "binge drink" and "binge drink". Exercise not only consumes energy, but also consumes water, especially after sweating a lot in hot summer, people often feel thirsty, which shows that the body is already in a state of water shortage, and dehydration will occur if water is not replenished in time. However, in the process of drinking tea, it should be a small number of times. Do not drink more than 600 ml of tea per hour. Only a "moderate amount" can maintain the balance of water in the body, otherwise drinking a large amount of tea at one time, caffeine and other ingredients in tea will increase the excitement of the heart and nerves, thus increasing the burden on the heart and lungs, which is not conducive to the recovery of physical functions.

The so-called timely, refers to exercise, tea to grasp the time. Many people like to drink tea immediately after physical exercise to quench their thirst quickly. In fact, this habit of drinking tea is unhealthy. On the one hand, after people stop physical exercise, the various functions of the body are still in a relatively high state. At this time, the pulse and blood pressure of human body will be higher than usual. Drinking tea immediately will obviously stimulate the heart and stomach and make the body uncomfortable. The correct time to drink tea is about 10 minutes after physical exercise, when the heart, lungs and stomach of the human body have gradually returned to normal; On the other hand, drinking water immediately after physical exercise will lead to dilution of body fluids, sudden increase of blood volume, and increase the burden on the heart. At the same time, a large amount of water stored in the stomach will also make people feel uncomfortable and reduce the recovery ability of body functions.

The so-called science means that after physical exercise, we should pay attention to the quality of tea and realize scientific tea drinking. Scientific tea drinking should mainly pay attention to the following aspects: avoid drinking overnight tea, because the nutrients such as protein, amino acids and vitamins in overnight tea have been destroyed, which can not only meet the nutritional needs after physical exercise, but even cause harm to the human body; Never drink the first sip of tea, because in the process of modern tea making, it will inevitably be polluted. The first kind of tea is commonly known as "washing tea" and is not suitable for drinking; Do not drink strong tea. Strong tea contains a lot of tea polyphenols, which easily reacts with iron in food, which is not conducive to the absorption of iron. Regular drinking will lead to anemia.

5 conclusion

To sum up, drinking tea properly after physical exercise plays an important role in restoring physical function. Organic and inorganic substances in tea soup can help replenish nutrients lost by human body. But pay attention to "appropriateness" in the process of drinking tea. Only drinking tea in moderation can really play a role in health care. Therefore, it is a simple and effective method to drink tea properly after physical exercise in order to achieve the purpose of real physical exercise and improve physical fitness.

References:

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[2] Zhu Yongxing, Huang, Yang Changyun. Harm of improper tea drinking to health: phenomenon, mechanism and countermeasures [J]. bulletin of science and technology, 2005 (5): 57 1-576.

[3] Guo. Several points for attention in drinking tea [J]. Farmer Consultant, 20 12 (10): 57.

[4] Wang Hao. Pay attention to drinking tea [J]. Journal of Tea Machinery, 1999 (1): 35.

[5] Li Zhongdong. Tea is exquisite [J]. Quality Exploration, 2007 (8): 48-49.

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