Overview
Microglobulin, specifically β2-microglobulin (B2M), is a small protein component of the major histocompatibility complex (MHC) class I molecules. It is ubiquitously present in biological fluids, including blood, urine, and cerebrospinal fluid. Due to its stability and low molecular weight, it serves as a critical biomarker in clinical and research settings. First identified in the 1960s, microglobulin has since been extensively studied for its role in immune regulation and disease processes. Elevated levels are associated with conditions such as kidney dysfunction, inflammatory diseases, and certain cancers, making it a valuable diagnostic tool.
Physical and Chemical Properties
Microglobulin is a compact, globular protein with a molecular weight of approximately 11.8 kilodaltons (kDa). It consists of 99 amino acids and lacks disulfide bonds, contributing to its structural stability. The protein is soluble in aqueous solutions and maintains its integrity across a wide pH range. Its stability under physiological conditions makes it suitable for long-term storage and handling in laboratory settings. However, exposure to extreme temperatures or repeated freeze-thaw cycles can degrade the protein, necessitating careful storage at -20°C or below.
Main Applications
In clinical diagnostics, microglobulin is primarily used to assess kidney function, as elevated serum levels indicate impaired glomerular filtration. It is also a marker for inflammatory diseases like rheumatoid arthritis and certain cancers, including multiple myeloma and lymphoma. Research applications include studies on immune system regulation, MHC class I assembly, and biomarker discovery. The protein’s role in amyloidosis, where it forms fibrillar deposits, is another area of active investigation.
Safety and Storage
Microglobulin is generally non-toxic but should be handled with standard laboratory precautions, including gloves and protective eyewear. Allergic reactions, though rare, have been reported in sensitive individuals. For long-term stability, store lyophilized powder at -20°C in a dry environment. Reconstituted solutions should be aliquoted to avoid repeated freeze-thaw cycles and stored at 4°C for short-term use or -80°C for extended periods.
B2B Procurement Guide
When procuring microglobulin for B2B purposes, prioritize suppliers with certifications such as ISO 13485 or GMP for clinical-grade material. Key specifications to verify include purity (≥95% by HPLC), endotoxin levels (<0.1 EU/μg), and batch-to-batch consistency. Pricing varies based on purity and volume, with research-grade material typically ranging from $50-$200 per mg. Bulk purchases may qualify for discounts, but ensure the supplier provides adequate stability data and technical support.
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