Tannic Acid

Dananthraquinone (Tannic Acid) has a wide range of uses and is described as follows: First and in the field of medicine, Dananthraquinone has a astringent effect. Applied to damaged areas of the skin, it can constrict local blood vessels, reduce exudation, help wound healing, and prevent infection. In ancient times, physicians often applied materials containing Dananthraquinone to quickly coagulate blood and stop pain. And it also has the effect of convergence in the intestines, relieving diarrhea and fixing the intestines to stop diarrhea. It is also used in the papermaking industry. It is added during the preparation of pulp to optimize the properties of paper. It can combine with cellulose to increase the strength of paper, making it tough and durable. The book is old, the paper is not easy to be damaged, and the power of Dan anthraquinone is also. The technology of tanning leather, Dan anthraquinone is indispensable. It can react with the protein in the leather to make it denatured, and the flexibility and wear resistance of the leather can be improved. After tanning the leather, it can be made into exquisite leather goods, which are new for a long time. In the matter of printing and dyeing, it is a mordant. When the fabric is dyed, the auxiliary dye is fixed on the fiber, and the color is bright and long-lasting. It is not easy to fade when washed and exposed. In the past, people weaved and dyed, and used Dan anthraquinone skillfully to make brilliant fabrics. In chemical synthesis, Dan anthraquinone is used as a raw material or catalyst. It In addition, dananthraquinone is also used in cosmetics, food preservation and other fields. In cosmetics, it may have antioxidant properties, skin care and beauty; when food is kept fresh, it prevents deterioration and decay, prolonging the life of food. In summary, dananthraquinone has a variety of uses and plays an important role in various industries, benefiting the world.

Tannic acid (Tannic Acid), also known as tannic acid, is a natural organic compound widely distributed in the plant kingdom, such as gall seeds, tea leaves, bark, etc. Its physical properties are quite unique, as detailed below: 1. ** Appearance **: Tannic acid usually appears as a light yellow to light brown amorphous powder or loose scales, which are delicate in appearance. This color and shape are also common in many natural products, just like the skin of deep mountain ancient trees. After years of erosion, it gradually becomes such a rustic color. 2. ** Solubility **: Tannic acid has good water solubility and can slowly diffuse in water to form a uniform solution. However, in cold water, the dissolution is slightly slower, if it dissolves in hot water, it is more rapid, just like ice and snow meet the warm sun, quietly turning invisible. In addition, it also has a certain solubility in organic solvents such as ethanol and acetone, showing affinity with various solvents. 3. ** Odor and taste **: Tannic acid is almost odorless, but it has a strong astringent taste when tasted. This astringent taste, such as when drinking strong tea, the sense of convergence on the tip of the tongue, is due to the combination of tannic acid and protein in the mouth, and is also a significant taste characteristic. 4. ** Melting point and stability **: The melting point of tannic acid is about 218 ° C, and the phase state will change at a specific temperature. Under normal storage conditions, tannic acid is relatively stable, but if exposed to air for too long, or exposed to extreme conditions such as high temperature and strong light, oxidation and other reactions will also occur, resulting in darker color and changed properties. Just like a delicate flower in a strong wind, it will inevitably lose its true color. 5. ** Hygroscopicity **: Tannic acid has a certain degree of hygroscopicity. In a humid environment, it can absorb moisture in the air, just like a sponge absorbs water, resulting in subtle changes in its own shape and properties. Therefore, it is necessary to pay attention to the dryness of the environment when storing.

Tannic acid, also known as tannic acid, is a rather unique organic compound. Its chemical properties are interesting and closely related to many fields. Tannic acid is often light yellow to light brown amorphous powder or loose scales, hygroscopic, easily soluble in water, ethanol and acetone, slightly soluble in ether and chloroform, insoluble in benzene, carbon disulfide and petroleum ether. From the perspective of chemical structure, tannic acid is a complex polyphenol compound composed of many gallic acyl groups connected by ester or ether bonds. This structure gives it special chemical activity. It has phenolic hydroxyl groups, which are weakly acidic and can react with bases to form salts. When exposed to an aqueous solution of ferric chloride, it will appear blue-black or green-black, which is often used for the identification of tannic acid. The chemical reactivity of tannic acid is very rich. On the one hand, due to the large number of phenolic hydroxyl groups, it is easily oxidized and gradually turns brown in the air. This oxidation process has a great impact on its stability and application. On the other hand, phenolic hydroxyl groups allow it to react with proteins, alkaloids, metal ions, etc. When interacting with proteins, the two form insoluble complexes, which is the principle of tannic acid used in tanning, which can make leather flexible and resistant to corrosion. Reacting with alkaloids can form precipitation, which is widely used in the separation and purification of alkaloids. With metal ions, such as iron, aluminum, copper, etc., can form non-ferrous complexes, and the color varies with metal ions. This property is also used in the fields of dyeing and analytical chemistry. In addition, tannic acid also has certain antioxidant properties, which can capture free radicals. It can be used as an antioxidant in the fields of food and medicine to delay the oxidative deterioration of food and protect biomacromolecules from oxidative damage. In short, the unique chemical properties of tannic acid make it useful in many industries such as tanning, medicine, food, printing and dyeing, and chemical industry. It is a valuable natural compound.

For tannic acid, there are various things to pay attention to during storage and transportation. Tannic acid is delicate, afraid of light and heat. If exposed to strong light or in a high temperature place, its quality is variable. Therefore, when storing, it is advisable to choose a cool, dry and dark corner to avoid light and hot topics to cause it to deteriorate and damage its effectiveness. Furthermore, tannic acid has hygroscopicity. If stored in a wet place, it is easy to absorb moisture, causing its properties to change or agglomerate. Therefore, when stored in a dry place, it can be supplemented with a desiccant to control the ambient humidity and maintain its dry state. When transporting, protection is also a priority. Tannic acid should be properly packaged to absorb shock and collision and cause damage to the package. If the package is damaged, the tannic acid will be exposed to the outside, and it will be easily affected by external factors. And the environment in the transport vehicle should also be paid attention to, so that the temperature and humidity are suitable, and it should not be placed in a bad environment. In addition, tannic acid may have the possibility of phase transformation with other things. When storing and transporting, it must not be placed in the same place with the reactive things. Otherwise, it may cause biochemical reaction, qualitative change of tannic acid, or cause safety risks. The chemical properties of tannic acid must be carefully observed, and it should be separated from other things according to its nature to ensure the purity of its quality and the safety of transportation. In this way, the quality of total tannic acid can be obtained, so that it can be used to the best of its effectiveness.

Tannic acid, also known as tannic acid, is prepared in three ways. One is the method of plant extraction. Many plants contain tannic acid, such as gallnut, tea, pomegranate skin, etc. Take gallnut as an example, its tannic acid content is quite high. Take gallnut first, crush it, and soak it in water or organic solvent. The water leaching is mild and simple, but it leaches out impurities or more; the organic solvent leaching, such as ethanol, has high extraction efficiency and few impurities. After leaching, the leaching liquid is obtained, filtered and removed, then concentrated, crystallized, and tannic acid can be obtained. This is a traditional method. The raw material is easy to find, but the extraction process is long, and the purity improvement requires multiple refining. The second is the method of chemical synthesis. Gallic acid and pyrogallic acid are used as raw materials, and under specific conditions, they are condensed. During the reaction, temperature, pH, and catalyst need to be precisely controlled. If the temperature is high, the reaction will be too fast, and the product will be impure; if the temperature is low, the reaction will be slow. The pH imbalance also affects the reaction process. The catalyst can accelerate the reaction, but the type and dosage are particular. After synthesis, the tannic acid can be obtained after separation and purification. The purity of tannic acid obtained by this method is high, but the raw materials are rare, the synthesis conditions are strict, and the cost is high. The third is the method of biological fermentation. Some microorganisms, such as Aspergillus, Penicillium, etc., can be fermented to produce tannic acid in a specific medium. Prepare a suitable medium first, containing carbon sources, nitrogen sources, inorganic salts, etc. Insertion of strains, temperature control, ventilation, stirring and other conditions. Microbial growth and metabolism produce tannic acid. After fermentation, it is separated from solid and liquid, sterilized and impurities are removed, and then concentrated and purified to obtain tannic acid. This method is green and environmentally friendly, with mild conditions, but the fermentation cycle is long and the yield may be limited. The breeding and culture of strains require technical support.