Gadolinium oxide Introduction
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Gadolinium oxide is a high-purity white inorganic powder. CAS: 12064-62-9. Molecular formula: Gd₂O₃, molecular weight: 362.5. EINECS: 235-060-9. It is derived from natural rare earth minerals such as monazite, and refined through multiple meticulous processes including solvent extraction, Oxalic acid precipitation, and high-temperature calcination. The overall production process is mature and highly precise.
The core application of Gadolinium oxide API is in medical magnetic resonance imaging (MRI) contrast materials. It can also be used in the production of X-ray sensitizing fluorescent materials, laser crystals, and optical glass. Furthermore, it is a key raw material for nuclear reactor control materials and magnetic bubble material additives, and can be used to prepare rare earth alloy products such as gadolinium and gadolinium-iron alloys.
Why is Gadolinium oxide the "soul" of MRI contrast agents?
The key to gadolinium oxide's status as a core ingredient in MRI contrast agents lies in its unique electronic properties. Possessing seven unpaired electrons, it exhibits extremely strong paramagnetic behavior, a significant advantage among common ions. Upon entering a magnetic field, it can drastically alter the local magnetic field environment, producing a noticeable magnetic moment perturbation effect.
When Gadolinium oxide API is refined and chelated into a medical formulation and introduced into the human body, gadolinium ions effectively shorten the longitudinal relaxation time of protons in surrounding water molecules. The corresponding imaging area appears brighter in MRI images, creating a sharp contrast with ordinary human tissue and significantly improving the imaging resolution of soft tissues.
This property allows doctors to clearly distinguish subtle lesions, including small tumors, inflammatory abnormalities, and vascular lesions. This is the fundamental reason why gadolinium-based contrast agents are irreplaceable in clinical contrast-enhanced MRI examinations.
It is worth noting that gadolinium oxide powder is not used directly in clinical practice. The actual medical finished product is a formulation prepared from high-purity Gadolinium oxide as the base material through multiple processes such as deep purification and stable chelation, in order to ensure the safety of human use and the stability of imaging.
The difference between gadolinium oxide and GADOXETATE DISODIUM contrast agents
Gadolinium oxide and GADOXETATE DISODIUM both contain the same elements, but their positions in nuclear magnetic resonance clinical applications are completely different.
Gadolinium oxide API is a high-purity inorganic raw material that inherently has biological toxicity and cannot be directly applied to the human body. It must undergo chelation processing to form a stable chelate before it can be made into an injectable solution for clinical use.
GADOXETATE DISODIUM is a liver-specific contrast agent that has been mass-produced and put into clinical use. Besides the vascular imaging effect of ordinary gadolinium contrast agents, it also has the property of targeting liver cells. Healthy liver cells can absorb this substance and excrete it along with bile, which can not only clearly show the distribution of liver blood flow but also reflect the liver's metabolic function, facilitating doctors in identifying and diagnosing various local liver lesions.
In terms of metabolic excretion, GADOXETATE DISODIUM is approximately half excreted through the kidneys and the other half metabolized through bile. The dual-channel clearance method reduces the renal metabolic pressure, and the risk of using it for people with impaired renal function is lower, with a very low probability of inducing renal systemic fibrosis.
Although the API of gadolinium oxide has better relaxation performance in laboratory tests, the long-term metabolic rules and potential toxic side effects have not been fully verified. Currently, it is mainly used in the research and experimental stage.
MF of Gadolinium oxide
| CAS | 12064-62-9 |
| Molecular formula | Gd2O3 |
| Molecular weight | 362.5 |
| EINECS | 235-060-9 |
| Melting point | 2330 °C |
| Density | 7.407 g/mL at 20 °C |
Specification
| Item | Specification | Result |
| Gd203/TREO (% min.) | 99.95% | 99.99% |
| TREO (% min.) | 99% | 99% |
| RE Impurities (%/TREO) | ||
| La203 | ≤0.005% | 0.0005% |
| Ce02 | ≤0.005% | 0.001% |
| Pr6011 | ≤0.005% | 0.001% |
| Nd203 | ≤0.005% | 0.001% |
| Sm203 | ≤0.005% | 0.003% |
| Non-RE Impurities (%) | ||
| Fe203 | ≤0.005% | 0.0005% |
| Si02 | ≤0.01% | 0.005% |
| Cao | ≤0.01% | 0.005% |
| Cuo | ≤0.05% | 0.0005% |
| PbO | ≤0.005% | 0.0005% |
| NiO | ≤0.005% | 0.001% |
| Conclusion | Conform with enterprise specification | |
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FAQ:
Q1:What are the purity requirements for Gadolinium oxide?
The purity of Gadolinium oxide used in the production of contrast agents must reach 99.99% or higher, and it must strictly comply with GMP standards to eliminate the impact of other rare earth or heavy metal impurities on imaging effects and human safety.
Q2:Besides medical applications, what other uses does Gadolinium oxide have?
It can also be used in the preparation of X-ray sensitizing fluorescent materials, laser crystals, optical glass, nuclear reactor control materials, and metallic gadolinium. Gadolinium oxide also has research potential in cutting-edge fields such as fluorescent labeling and antibacterial materials.
Q3:Is gadolinium oxide related to mobile phones and computers?
Indirectly related. Gadolinium oxide can be used to manufacture optical glass and laser crystals, which are components in optical communications, precision instruments, and some electronic devices; however, it is not the semiconductor material we usually refer to.
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