Overview
Free Thyroxine (FT4) is the biologically active, unbound fraction of the thyroid hormone thyroxine (T4), accounting for approximately 0.03% of total T4 in blood. Unlike protein-bound T4, FT4 directly interacts with cells to regulate metabolism, growth, and development. It serves as a critical biomarker in clinical diagnostics for thyroid disorders such as hyperthyroidism and hypothyroidism. In B2B contexts, FT4 is primarily supplied as a reference standard for immunoassays or as a raw material for diagnostic kit production. Its stability and purity are strictly controlled to ensure accurate test results in medical laboratories.
Physical and Chemical Properties
FT4 is an iodinated aromatic compound with a molecular weight of 776.87 g/mol. Its crystalline form is stable under recommended storage conditions but degrades upon prolonged exposure to light or heat. The hormone’s solubility profile dictates its handling: it requires alkaline buffers (pH >9) for complete dissolution, which is essential when preparing calibration solutions. Key chemical properties include its ability to bind nuclear thyroid receptors and its structural similarity to triiodothyronine (T3). The presence of four iodine atoms makes it susceptible to deiodination, a process monitored during quality control in pharmaceutical-grade production.
Main Applications
FT4’s primary commercial use is in vitro diagnostic (IVD) testing, particularly chemiluminescent immunoassays (CLIA) and ELISA kits. These tests measure FT4 levels to assess thyroid function, aiding in diagnosing Graves’ disease, Hashimoto’s thyroiditis, and pituitary disorders. High-sensitivity assays require ultrapure FT4 with minimal cross-reactivity to other thyroid hormones. Research applications include studies on thyroid hormone metabolism and drug interactions. Some pharmaceutical companies utilize FT4 derivatives in drug development for metabolic disorders. B2B buyers typically procure it in milligram quantities for assay calibration or bulk quantities for kit manufacturing.
Safety and Storage
While FT4 poses low acute toxicity, proper handling minimizes risks. Powdered forms may cause irritation if inhaled; thus, fume hoods are recommended during weighing. Solutions should be prepared in controlled environments to avoid accidental exposure. Storage at 2-8°C in amber glass vials preserves stability for up to 24 months. Suppliers often provide argon-purged containers to prevent oxidation. Transportation requires cold chain logistics with temperature monitoring, especially for international shipments where customs delays may occur.
B2B Procurement Guide
Procuring FT4 demands attention to technical specifications. Reputable suppliers should provide: (1) HPLC chromatograms confirming ≥98% purity, (2) mass spectrometry data verifying molecular identity, and (3) endotoxin testing reports for IVD-grade material. Bulk buyers should request batch-specific stability data. Pricing varies by purity tier: research-grade (90-95%) costs $50-$100/mg, while IVD-grade (≥98%) ranges from $150-$200/mg. Long-term contracts with manufacturers often yield volume discounts. Audit supplier GMP/ISO 13485 certifications to ensure compliance with diagnostic industry standards.
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