CN1085050C

CN1085050C - Low-fluorine brick tea and its production process

Info

Publication number: CN1085050C
Application number: CN99115669A
Authority: CN
Inventors: 曹进; 赵燕; 刘箭卫
Original assignee: HUNAN MEDICAL UNIV
Current assignee: HUNAN MEDICAL UNIV
Priority date: 1999-12-01
Filing date: 1999-12-01
Publication date: 2002-05-22
Anticipated expiration: 2019-12-01
Also published as: CN1252229A

Abstract

The present invention relates to a low-fluorine brick tea and a production process thereof. The low-fluorine brick tea is prepared by uniformly mixing a fluorine reducing additive with tea. The fluorine reducing additive can be any one of pearl calcium or persimmon leaf powder or animal charcoal powder, wherein the pearl calcium accounts for 0.05 wt% to 2 wt% of gross tea, the persimmon leaf powder accounts for 0.01 wt% to 2 wt% of the gross tea, and the animal charcoal powder accounts for 0.001 wt% to 8 wt% of the gross tea. The production process comprises the steps that after being steamed and retted, the gross tea is spread out in a working place; the fluorine reducing additive is added according to the weight proportion and thoroughly and uniformly mixed with the gross tea; and the mixture is pressed, shaped, floated, dried and packaged to obtain the finished product. The production process has the advantage that high content of fluorine in the tea can be eliminated effectively without influencing the inherent flavor of the brick tea.

Description

Low-fluorine brick tea and production method thereof

Tea tree isa fluorine-rich plant which can selectively absorb fluorine in soil into the body, and the fluorine is accumulated mainly in leaves, and the longer the accumulation time is, the higher the fluorine content is. The high-fluorine brick tea is made of old leaves, so the fluorine content of the brick tea is dozens of times or even hundreds of times of that of common commercial tea sold on the market. Long-term drinking of the brick tea with high fluorine can lead to yellow stain and defect of teeth for children, which is the early manifestation of fluorosis, namely, dental fluorosis. In the middle and old age, the limbs and joints are painful, the movement is limited until the limbs and joints are stiff, humpback, lameness and even paralysis, and the fluorosis is caused by fluorosis. A large number of researches also prove that the kidney function, the liver function and the reproductive function of the organism can be damaged by drinking the high-fluorine brick tea for a long time.

The existing brick tea is known to have high fluorine content, and any low-fluorine brick tea and a production process thereof are not found.

The invention aims to provide a low-fluorine brick tea and a production process thereof, the low-fluorine brick tea can selectively remove high-quantity fluorine in tea leaves without influencing the inherent flavor of the brick tea, and the low-fluorine brick tea has simple process and low cost.

The low-fluorine brick tea is prepared by uniformly mixing a fluorine reducing additive in tea leaves, wherein the fluorine reducing additive can be any one of Zhenzhu calcium or persimmon leaf powder or bone charcoal powder, the Zhenzhu calcium accounts for 0.05-2% of the weight of the raw tea, the persimmon leaf powder accounts for 0.01-2% of the weight of the raw tea, and the bone charcoal powder accounts for 0.001-8% of the weight of the raw tea.

The production process of the low-fluorine brick tea comprises the following steps:

spreading the steamed and retted piled raw tea on a working site, adding the fluorine-reducing additive into the raw tea according to the weight proportion, fully and uniformly mixing, pressing and shaping, and packaging the finished product after flowering and drying. The fluorine-reducing additive can be pearl powder, and the content of the pearl powder is 0.05 to 2 percent of the weight of the raw tea; the fluorine-containing additive can be persimmon leaf powder, and the content of the fluorine-containing additive is 0.01-2% of the weight of the raw tea; the fluorine additive can also be bone charcoal powder, and the content of the fluorine additive is 0.001% -8% of the weight of the raw tea.

The low-fluorine brick tea prepared by the process reduces the fluorine content of the brick tea, thereby avoiding the fluorine damage caused by long-term drinking of the brick tea by human bodies. The method has the advantages of effectively removing high fluorine content in the tea leaves without influencing the inherent flavor of the brick tea, along with simple process, low cost and easy popularization.

Example 1: uniformly spreading 100 kg of steamed and retted raw tea in a working site, dissolving 0.05 kg or 0.5 kg or 2 kg of real pearl calcium in 10 kg of water, uniformly adding the calcium into the raw tea in a spraying manner, then pressing and shaping, carrying out flowering drying, and packaging finished products.

Example 2: uniformly spreading 100 kg of steamed and retted raw tea in a working site, putting 0.01 kg or 0.1 kg or 2 kg of persimmon leaf powder into 10 kg of water, adding the persimmon leaf powder into the raw tea in a uniformly spreading manner, then pressing and shaping,carrying out flowering and drying, and packaging finished products.

Example 3: uniformly spreading 100 kg of steamed and retted raw tea in a working site, putting 0.001 kg or 0.1 kg or 8 kg of bone charcoal powder into 10 kg of water, stirring, adding into the raw tea in a uniformly spraying manner, then pressing and shaping, growing flowers and drying, and packaging finished products.

The basic chemical reaction formula of the Zhenzhu calcium brick tea fluorine reducing agent is as follows:

the basic chemical reaction formula of the bone charcoal powder for reducing brick tea fluorine is as follows:

the bone charcoal powder has large surface area and high porosity, can selectively adsorb fluorine ions, and can form hydroxyl calcium phosphate similar to fluorine-containing calcium phosphate crystal after hydroxylation, and OH^-And F^-With similar radii, a displacement reaction can occur.

Although the fluorine reduction mechanism of the persimmon leaf powder is unknown, the effect experiment shows that the fluorine reduction effect is good.

TABLE 1 fluorine reducing effect after adding Callicarpa henryi into brick tea at different dosages, different dosage of fluorine reducing effect and fluorine reducing rate

0.05% (PPM) reduction rate (%) 0.5% (PPM) reduction rate (%) 2% (PPM) reduction rate (%) Zhenzhu calcium 2.0540.582.1138.841.6253.04 (the fluorine content of brick tea before adding fluorine-reducing agent is 3.45PPM

TABLE 2 fluorine reducing effect of different persimmon leaves added with brick tea, different fluorine reducing effect and fluorine reducing rate

0.01% (PPM) reduction rate (%) 0.1% (PPM) reduction rate (%) 2% (PPM) reduction rate (%) persimmon leaf powder 2.2036.232.3133.041.8543.38 and brick tea fluorine content before adding fluorine reducing agent are all 3.45PPM

TABLE 3 fluorine reducing effect of various kinds of products with fluorine reducing effect and fluorine reducing rate after adding powdered charcoal into brick tea

0.001% (PPM) reduction rate (%) 0.1% (PPM) reduction rate (%) 2% (PPM) reduction rate (%) persimmon leaf powder 1.9842.611.8247.251.2364.35 and brick tea fluorine content before adding fluorine reducing agent are all 3.45PPM

The above table shows that the effect of the three fluorine reducing agents on reducing the fluorine content of the brick tea achieves the effect of preventing the fluorosis.

Animal experiments:

the experimental material is Wistar rat, the weight is 52-65 g, the male and female are half and half, the period is one year, the dental fluorosis is the most sensitive index of the internationally recognized fluorosis, so the incidence of the upper incisor and the lower incisor of the animal is used as the fluorosis judgment standard in the experiment.

TABLE 4 fluoride effect and fluorine reducing rate of animals in animal experiment group for preventing fluorosis

6-month-one-year Zhenzhu calcium brick tea 156000 persimmon leaf powder brick tea 156025 bone charcoal powder brick tea 156000 common brick tea 15601242

As seen from the above table, most of the animals drinking the brick tea containing three fluorine reducing agents do not have the dental fluorosis after half a year and one year, while the animals drinking the common brick tea have the dental fluorosis of 20 percent after half a year and 70 percent after one year, and the three low-fluorine brick tea groups have high significant difference (P is less than 0.01) compared with the common brick tea group.

And (3) safety evaluation:

the Kunming mouse has the weight of 20-23 g, 10 mice per group, half each male and female and common food, but low-fluorine brick tea water is taken as the only drinking water source, the concentration of the low-fluorine brick tea water is 1%, the growth, the development, the food intake and the food utilization rate of rats added with the pearl powder brick tea, the persimmon leaf brick tea and the bone and charcoal powder brick tea are not affected for 90 days continuously, no adverse effect is caused on hemogram, liver and kidney functions, and the main organs such as liver and kidney are not changed abnormally in tissue morphology.

Claims

1. A low-fluorine brick tea is characterized in that a fluorine reducing additive is uniformly mixed in tea leaves, the fluorine reducing additive is any one of Zhenzhu calcium or persimmon leaf powder, the Zhenzhu calcium accounts for 0.05-2% of the weight of the raw tea, and the persimmon leaf powder accounts for 0.01-2% of the weight of the raw tea.

2. A production method of low-fluorine brick tea comprises the steps of spreading and placing piled raw tea in a working place, adding a fluorine-reducing additive into the raw tea according to a weight ratio, fully and uniformly mixing, pressing and shaping, drying flowers, and packaging finished products, and is characterized in that the fluorine-reducing additive is calcium pearl, and the content of the fluorine-reducing additive is 0.05-2% of the weight of the raw tea.

3. A production method of low-fluorine brick tea is characterized in that the fluorine reducing additive is persimmon leaf powder, and the content of the fluorine reducing additive is 0.01-2% of the weight of the raw tea.