Pyrophosphoric Acid Powder is an inorganic compound with chemical formula H4P2O7. It is a colorless viscous liquid, which forms crystals after being put for a long time. It is colorless and glassy. Soluble in water, but also soluble in alcohol and ether. Pyrophosphate has strong coordination and is used as catalyst and concealing agent; It is used as catalyst, metal refining and stabilizer of organic peroxide. It is used to adjust the pH value of electroplating solution in copper electroplating process, as well as other electroplating.
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Chemical Formula |
H4O7P2 |
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Exact Mass |
178 |
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Molecular Weight |
178 |
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m/z |
178 (100.0%), 180 (1.4%) |
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Elemental Analysis |
H, 2.27; O, 62.93; P, 34.81 |
Pyrophosphoric Acid powder has extensive and profound applications in the field of biomedicine. Its core value stems from its unique chemical structure - a dimer formed by the connection of two phosphate groups through an oxygen bridge, which endows it with strong acidity, high reactivity, and excellent complexation ability. The following elaborates on its biomedical applications from four dimensions: basic metabolic regulation, bone metabolic balance, drug development, and biological analysis.
Regulation of Basal Metabolism: Key Participants in Energy Conversion
Forthyl is the core intermediate of energy metabolism in the biological system, playing a crucial role especially in the hydrolysis of ATP (adenosine triphosphate). ATP, as the "energy currency" of cells, releases a large amount of energy through its hydrolysis into AMP (adenosine monophosphate) and fructose-1,6-bisphosphate (PPi). This process drives muscle contraction, substance transportation, and other life activities. Fructose-1,6-bisphosphate is further hydrolyzed into two phosphate groups under the catalysis of inorganic fructose-1,6-bisphosphatase. This process not only completes the closed loop of energy release but also ensures the irreversibility of biosynthetic reactions (such as protein and nucleic acid synthesis) by consuming high-energy phosphate bonds, thereby maintaining the precise regulation of metabolic direction.
Bone Metabolism Balance: A Natural Barrier Against Calcification
Pyrophosphate plays the role of a "calcification inhibitor" in bone metabolism. In joint fluid, plasma, and urine, pyrophosphate inhibits the crystallization of hydroxyapatite (the main inorganic component of bones), preventing pathological calcification. For instance, in patients with osteoarthritis, the concentration of pyrophosphate in joint fluid significantly decreases, leading to accelerated cartilage calcification and causing joint pain and dysfunction. Additionally, the calcification inhibitory effect of pyrophosphate is crucial in the prevention of kidney stones, as it chelates calcium ions in urine, reduces the deposition of calcium oxalate crystals, and lowers the risk of stone formation. Therefore, the content of pyrophosphate in plasma, serum, and biological fluids becomes an important biomarker for research on bone metabolism diseases, kidney stones, and osteoarthritis.
Drug Development: The Widespread Application of Multifunctional Raw Materials
Pyrophosphate powder has multiple values in drug development:
Enhanced drug stability
Phosphate salts (such as sodium pyrophosphate) act as stabilizers, regulating the pH of the drug to prevent degradation during storage. For example, adding phosphate salts to antibiotic formulations can significantly extend the drug's shelf life.
Optimized solubility
Phosphate forms complexes with drug molecules, enhancing the water solubility of the drug and thereby increasing bioavailability. For instance, certain anti-tumor drugs achieve targeted delivery through phosphate modification, enhancing efficacy and reducing side effects.
Drug synthesis catalyst
Phosphate serves as a catalyst or reaction intermediate, facilitating key steps in drug synthesis. For example, during the synthesis of the intermediate of the anti-nausea drug fosaprepitant - pyrophosphate tetrabenzyl ester, phosphate stabilizes the reaction intermediate, improving synthesis efficiency and product purity.
Bioanalysis: The cornerstone of highly sensitive detection
The detection of phosphate is of great significance in biomedical research. Currently, the reagents for detecting phosphate on the market are mainly divided into colorimetric methods and fluorescence methods:
Colorimetric method
Based on the catalytic action of inorganic pyrophosphatase in hydrolyzing pyrophosphate into phosphate ions, followed by the consumption of phosphate ions through the MESG/PNP reaction, the concentration of pyrophosphate can be quantified by detecting the change in absorbance at a wavelength of 360 nm. This method is simple to operate, but it requires the participation of two enzymes and the steps are relatively complex.
Fluorescence method
Using the PPi fluorescence sensor (excitation/emission wavelengths 316/456 nm), the fluorescence intensity is proportional to the concentration of pyrophosphate. Compared with the colorimetric method, the fluorescence method has higher sensitivity and specificity, and is simpler to operate, making it an ideal tool for high-throughput screening of enzyme activity or inhibitors. For example, the pyrophosphate fluorescence detection kit launched by Yixing Biotechnology has been successfully applied to the detection of various samples such as urine, serum, and plasma, providing efficient technical support for the research of bone metabolism diseases.
1. Heat Pyrophosphoric Acid Powder to 519K, and form pyrophosphoric acid after losing water;
2. Pure pyrophosphoric acid can be prepared by heating orthophosphoric acid and phosphorus oxychloride:
3. Pure pyrophosphoric acid can also be obtained by heating sodium hydrogen phosphate to obtain sodium pyrophosphate, dissolving it, transforming it into lead pyrophosphate precipitation, then introducing hydrogen sulfide, filtering and concentrating the filtrate in vacuum at low temperature.
1. It is easy to change into orthophosphate when diluted with water
H4P2O7+H2O=2H3PO4
It is soluble in water, and its aqueous solution is strongly acidic:
K1=7.5 × 10-1
K2=6.2 × 10-2
K3=1.7 × 10-6
K4=6.0 × 10-9
(The chain and ring structures of pyrophosphoric acid powder, tetrametaphosphate or other polyphosphoric acid are formed by dehydration and condensation of orthophosphoric acid, and are all condensed acids. Generally, the acidity of condensed acids is greater than that of monoacids, because the volume of condensed acid radical ions is large, and the negative charge density on its surface is much lower, so the condensed acids are easy to dissociate protons. The greater the degree of condensation of similar oxygen-containing acids, the stronger the acidity.)
2. Pyrophosphate radical meets silver salt to form white silver pyrophosphate precipitation. The rate of P2O74 - to PO43 - conversion in solution is very slow. This reaction can be used to identify P2O74 - and PO43 - (Ag3PO4 is yellow precipitation);
P2O74-+4Ag+=Ag4P2O7↓
3. Pyrophosphate has strong coordination. Excessive P2O74- can dissolve insoluble pyrophosphates (Cu2+, Ag+, Zn2+, Mg2+, Ca2+, Sn2+, etc.) to form coordination ions, such as [Cu (P2O7) 2] 6-, [Sn (P2O7) 2] 6 -, etc.
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What are the side effects of this compound?
Potential impact on human health
Skin contact: May be irritating, prolonged or high concentration exposure may cause skin redness, swelling, pain or itching. Long term exposure may also cause skin inflammation or allergic reactions.
Eye contact: If it enters the eyes, it may cause eye pain, redness, tearing, or blurred vision. In severe cases, it may lead to corneal damage or blindness.
Inhalation: Long term or high concentration inhalation of dust may cause irritation to the respiratory tract, leading to symptoms such as coughing, difficulty breathing, or asthma. Long term inhalation may also increase the risk of respiratory diseases.
Ingestion: Ingestion may cause damage to the oral, esophageal, or gastric mucosa, leading to symptoms such as nausea, vomiting, and abdominal pain. Excessive intake may be life-threatening.
Potential impact on the environment
Water pollution: If leaked into a water body, it may alter the pH value of the water and affect the survival of aquatic organisms. Long term accumulation may lead to eutrophication of water bodies, causing excessive growth of algae and damaging aquatic ecosystems.
Soil pollution: Accumulation in soil may affect soil fertility and structure, reducing crop yield and quality. It may also have toxic effects on microorganisms and plant roots in the soil.
Air pollution: During production, processing, or use, dust or harmful gases may be generated, causing pollution to air quality. Long term inhalation of these pollutants may have adverse effects on human health.
Other potential risks
Corrosivity: It may have a certain degree of corrosiveness and can corrode materials such as metals and glass. Contact with these materials during use or storage may result in leakage or damage.
Explosive: Under certain conditions, it may react with certain substances to produce explosive gases or mixtures. This increases the risk of fire and explosion.
Ecological chain disruption: Its pollution may be transmitted through the food chain, causing harm to organisms in the ecosystem. It may even affect the balance and stability of ecosystems.
FAQ
1. What is pyrophosphoric acid used for?
Pyrophosphoric acid is an ingredient of a radiopharmaceutical used to visualize bone abnormalities and cardiovascular abnormalities and also used as an ingredient in some products to prevent iron deficiency anemia.
2. How do you prepare Pyrophosphorous acid?
Preparation. It can be prepared by reaction of phosphoric acid with phosphoryl chloride: 5 H 3PO 4 + POCl 3 → 3 H 4P 2O 7 + 3 HCl. It can also be prepared by ion exchange from sodium pyrophosphate or by treating lead pyrophosphate with hydrogen sulfide.
3. Is pyrophosphoric acid a strong acid?
Pyrophosphoric Acid is a medium-strong inorganic hygroscopic by nature and is a colourless as well as odourless chemical. Anions, salts, and esters of pyrophosphoric acid are called pyrophosphates.
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