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Caffeic acid powder, also known as 3,4-dihydroxycinnamic acid, is an organic acid with a chemical formula of C9H8O4. It belongs to a class of compounds known for their phenolic structure and exhibits various biological activities. It is a yellow crystalline powder that can be obtained from concentrated aqueous solutions. It forms a monohydrate when crystallized from dilute aqueous solutions. Its decomposition point is around 225°C, with a softening point at 194°C. It contains a cinnamic acid backbone with hydroxyl groups attached to the 3rd and 4th positions of the phenyl ring. This structure gives it unique properties and biological activities.
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Chemical Formula |
C9H8O4 |
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Exact Mass |
180.04 |
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Molecular Weight |
180.16 |
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m/z |
180.04 (100.0%), 181.05 (9.7%) |
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Elemental Analysis |
C, 60.00; H, 4.48; O, 35.52 |
Caffeic acid powder is a naturally occurring phenolic acid compound with the chemical formula C ₉ H ₈ O ₄, widely distributed in coffee, fruits, vegetables, and traditional Chinese medicine. Its structure contains one benzene ring and two hydroxyl groups, endowing it with strong antioxidant capacity and various biological activities.
The application in the field of medicine accounts for over 60%, covering multiple directions such as hemostasis, anti-inflammatory, antiviral, anti-tumor, and immune regulation.
Hemostasis and leukocyte elevation
Hemostasis mechanism: By enhancing platelet function, promoting platelet aggregation, and shortening bleeding time. Clinically used for preventing bleeding in surgical procedures, or treating internal medicine, obstetrics and gynecology bleeding diseases (such as excessive menstruation, nosebleeds, gum bleeding).
Elevated leukocyte function: stimulates bone marrow hematopoiesis, promotes leukocyte production, and is used to treat leukopenia after radiotherapy and chemotherapy, as well as leukopenia caused by chronic hepatitis, splenic hyperfunction, etc.
Combination therapy: often used in combination with recombinant human granulocyte colony-stimulating factor and vitamin B4 tablets to enhance therapeutic efficacy. For example, in patients with decreased white blood cells after tumor radiotherapy and chemotherapy, the combination of 4-(2'-carboxyvinyl)-1,2-dihydroxybenzene tablets can restore the white blood cell count to the normal range within 2 weeks.
Anti inflammatory and antioxidant properties
Anti inflammatory mechanism: Inhibits the production of inflammatory factors (such as TNF - α, IL-6) and reduces inflammatory response. Clinically used as an adjuvant therapy for chronic inflammatory diseases such as arthritis and inflammatory bowel disease.
Antioxidant effect: Clearing free radicals, protecting cells from oxidative damage, delaying aging, and reducing the risk of cardiovascular disease. Research has shown that it can reduce the oxidation level of low-density lipoprotein (LDL) and improve lipid metabolism.
Antiviral and antibacterial
Antiviral activity: It has inhibitory effects on herpes simplex virus, hepatitis B virus, etc. In vitro experiments have shown that it can block virus adsorption and replication, providing potential targets for the development of antiviral drugs.
Antibacterial spectrum: It has inhibitory effects on bacteria such as Staphylococcus aureus and Escherichia coli, as well as fungi such as Candida albicans, and can be used for local treatment of skin infections, oral ulcers, and other conditions.
Antitumor and neuroprotection
Antitumor mechanism: induces apoptosis of tumor cells and inhibits angiogenesis. Research shows that it can inhibit the proliferation of breast cancer and lung cancer cells, and enhance the sensitivity of chemotherapy drugs.
Neuroprotective effect: protects nerve cells from oxidative stress damage and may be used for the prevention of neurodegenerative diseases such as Alzheimer's disease and Parkinson's disease. Animal experiments have shown that 4-(2'-carboxyvinyl)-1,2-dihydroxybenzene can improve cognitive function and reduce the deposition of beta amyloid protein.
The application in the food industry accounts for about 25%, mainly as natural preservatives, antioxidants, and functional ingredients.
1. Natural preservatives
Antibacterial mechanism: destroys the structure of bacterial cell membranes and inhibits microbial growth. It has a significant inhibitory effect on common foodborne pathogens such as Escherichia coli and Salmonella, and can be used for food preservation such as meat, dairy products, and fruit juice.
Application case: Adding 0.05% 4-(2'-carboxyvinyl)-1,2-dihydroxybenzene to apple juice can extend the shelf life from 7 days to 14 days while maintaining color and flavor.
2. Antioxidant
Preventing oil oxidation: It can chelate metal ions, block free radical chain reactions, and delay oil rancidity. Adding 0.02% 4-(2'-carboxyvinyl)-1,2-dihydroxybenzene to edible oil can reduce the peroxide value by 60% and extend the shelf life.
Functional food development: Adding antioxidant ingredients to beverages and pastries to enhance their health value. For example, fortified sports drinks can reduce muscle oxidative damage after exercise and accelerate recovery.
3. Flavor and color improvement
Flavor adjustment: It has a slightly bitter and sour taste, and can provide complex aromas for foods such as coffee and chocolate.
Color stability: In fruit and vegetable processing, 4-(2'-carboxyvinyl)-1,2-dihydroxybenzene can inhibit enzymatic browning and maintain product color. For example, soaking 4-(2'-carboxyvinyl)-1,2-dihydroxybenzene solution in apple slices can reduce browning by 80%.
The application in the cosmetics field accounts for about 10%, mainly as antioxidants, antibacterial agents, and skin protectants.
1. Antioxidant skincare
Eliminate free radicals: can penetrate deep into the skin, neutralize UV induced free radicals, and reduce photoaging damage. Clinical research shows that the cream containing 1% 4-(2'-carboxyvinyl)-1,2-dihydroxybenzene can increase skin elasticity by 20% and reduce wrinkle depth by 15%.
Synergistic effect: When combined with vitamin C and vitamin E, it can enhance the antioxidant effect. For example, the application of 4-(2'-carboxyvinyl)-1,2-dihydroxybenzene vitamin C complex in sunscreen products can increase the SPF value by more than 30%.
2. Antibacterial and anti-inflammatory properties
Acne treatment: It has an inhibitory effect on Propionibacterium acnes and reduces inflammatory response. The gel containing 0.5% 4-(2'-carboxyvinyl)-1,2-dihydroxybenzene can reduce the number of acne lesions by 40% and the degree of redness and swelling by 50%.
Oral care: Adding it to toothpaste and mouthwash can inhibit the growth of oral bacteria, prevent gingivitis and bad breath.
3. Hair care
Preventing hair loss: 4-(2'-carboxyvinyl)-1,2-dihydroxybenzene can stimulate hair follicle cell proliferation and prolong the hair growth period. Shampoo containing 2% 4-(2'-carboxyvinyl)-1,2-dihydroxybenzene can reduce hair loss by 30% and increase new hair growth rate by 25%.
Scalp Health: Regulate scalp oil secretion and improve seborrheic dermatitis.
1. Agricultural sector
Plant growth regulation: can promote seed germination, root growth, and improve crop stress resistance. For example, under drought conditions, treatment can increase wheat yield by 15%.
Disease and pest control: It has a contact killing effect on pests such as aphids and spider mites, while inducing plants to produce disease resistant proteins to enhance disease resistance.
2. Materials Science
Polymer material modification: Phenolic hydroxyl groups in 4-(2'-carboxyvinyl)-1,2-dihydroxybenzene can undergo crosslinking reactions with polymers to improve the mechanical properties of the material.
For example, the tensile strength of 4-(2'-carboxyvinyl)-1,2-dihydroxybenzene modified epoxy resin is increased by 30%, and the heat resistance is increased by 20 ℃.
Biosensors: As electronic transfer media, construct biosensors such as glucose and DNA to improve detection sensitivity.
With its unique chemical structure and multi-target biological activity, it has become a "star ingredient" in the fields of medicine, food, cosmetics, and scientific research. From hemostasis and leukocyte elevation to anti-tumor neuroprotection, from natural preservatives to antioxidant skincare, the application boundaries of 4-(2'-carboxyvinyl)-1,2-dihydroxybenzene continue to expand.
Synthesis Method
Chemical Synthesis
1. Starting Materials
The starting materials for the synthesis of 4-(2'-carboxyvinyl)-1,2-dihydroxybenzene typically include aromatic compounds that can be modified to introduce the desired hydroxyl and carboxylic acid groups.
2. Synthetic Routes
Several synthetic routes have been reported for the preparation of 4-(2'-carboxyvinyl)-1,2-dihydroxybenzene. One common approach involves the modification of cinnamic acid or its derivatives. Here is a general outline of a possible synthetic route:
Step 1: Starting from Cinnamic Acid
Cinnamic acid (3-phenylprop-2-enoic acid) serves as the starting material.
Step 2: Hydroxylation of the Aromatic Ring
The aromatic ring of cinnamic acid is hydroxylated at the 3- and 4-positions to form 4-(2'-carboxyvinyl)-1,2-dihydroxybenzene. This step can be achieved through various methods, such as:
Chemical Oxidation: Using oxidizing agents like potassium permanganate or hydrogen peroxide in the presence of a suitable catalyst.
Biocatalytic Oxidation: Employing enzymes or microorganisms that can catalyze the hydroxylation reaction.
Example Reaction Sequence (Simplified)
While the exact reaction conditions and yields may vary depending on the specific method used, a simplified example of a possible reaction sequence could involve:
Selective Hydroxylation: Cinnamic acid is subjected to a selective hydroxylation reaction to introduce a hydroxyl group at the 4-position of the aromatic ring, forming 4-hydroxycinnamic acid.
Further Hydroxylation: The resulting 4-hydroxycinnamic acid is then subjected to another hydroxylation reaction to introduce a second hydroxyl group at the 3-position, yielding 4-(2'-carboxyvinyl)-1,2-dihydroxybenzene.
Note: The actual synthesis of 4-(2'-carboxyvinyl)-1,2-dihydroxybenzene is likely to involve more complex reaction conditions, catalysts, and work-up procedures to optimize yield and purity.
3. Purification
After the synthesis is complete, the crude product is purified to remove impurities and isolate 4-(2'-carboxyvinyl)-1,2-dihydroxybenzene in its pure form. This can be achieved through techniques such as crystallization, distillation, or chromatography.
Biological Synthesis
While chemical synthesis is the most common approach, Caffeic acid powder can also be produced through biological synthesis, such as fermentation of certain microorganisms or plant-based extraction. However, these methods are generally less scalable and reproducible compared to chemical synthesis.
Determination of 4-(2'-carboxyvinyl)-1,2-dihydroxybenzene in dandelion by HPLC [test article] taraxacummongolicum hand. Mazz., taraxacummongolicum t sinicumKitag.
(1) Chromatographic conditions: use silica gel containing octadecyl silane bond as filler; Methanol phosphate buffer solution (1.56g sodium dihydrogen phosphate, dissolved into 1000ml with water, and adjusted to pH value of 3.8-4.0 with 1% phosphoric acid solution) (23:77) was used as the mobile phase; The detection wavelength was 323nm; Column temperature 40 ℃. The theoretical number of plates is calculated according to the 4-(2'-carboxyvinyl)-1,2-dihydroxybenzene peak, which is not less than 3000.
(2) Preparation of reference solution: take 7.5mg of 4-(2'-carboxyvinyl)-1,2-dihydroxybenzene reference, accurately weigh it, place it in a 50ml measuring flask, add methanol to the scale, and shake it well; Accurately measure 2ml, put it into a 10ml measuring flask, add methanol to the scale, shake well, and get (30% 4-(2'-carboxyvinyl)-1,2-dihydroxybenzene per ml) μ g).
(3) Preparation of sample solution: take about 1g of medicinal powder, accurately weigh it, place it in a 50ml conical flask with a stopper, accurately add 10ml of 5% formic acid methanol solution, tightly plug it, shake it, weigh it, sonicate for 30min, take it out, cool it, weigh it again, make up for the lost weight with 5% formic acid methanol solution, shake it well, centrifuge it, take the supernatant, and use microporous filter membrane (0.45 μ m) Filter and put the filtrate in a brown bottle.
(4) Determination method: accurately absorb 10% of the reference solution and 10% of the sample solution respectively μ l. Inject it into the liquid chromatograph and measure it.
(5) Determination result: the content of 4-(2'-carboxyvinyl)-1,2-dihydroxybenzene in dandelion is not less than 0.02% based on the dried product.
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