Overview
5-Bromo-4-chloro-3-indolyl phosphate (BCIP) is a critical reagent in molecular biology and diagnostic assays. It serves as a substrate for alkaline phosphatase (AP), an enzyme commonly used in detection systems. Upon enzymatic cleavage, BCIP produces a blue indigo dye, enabling visual or spectrophotometric detection of target molecules. Its high sensitivity and compatibility with nitroblue tetrazolium (NBT) make it a staple in research and clinical laboratories. Developed in the 1980s, BCIP remains a preferred choice due to its stability and low background interference. It is widely employed in techniques like Western blotting for protein detection and in situ hybridization for nucleic acid localization. The compound’s reliability has cemented its role in both academic and industrial settings.
Physical and Chemical Properties
BCIP is a white to off-white crystalline powder with a molecular weight of 326.47 g/mol. It is sparingly soluble in water but dissolves readily in organic solvents such as DMF and DMSO. The compound decomposes at around 200°C, and its solubility profile necessitates careful preparation of stock solutions for laboratory use. Chemically, BCIP is stable under recommended storage conditions (-20°C, protected from light). However, prolonged exposure to light or moisture can degrade its performance. Its chromogenic reaction with alkaline phosphatase is pH-dependent, typically optimized at pH 9–10. The resulting indigo precipitate is insoluble, ensuring localized signal detection with minimal diffusion.
Main Applications
BCIP is primarily used in conjunction with NBT for detecting alkaline phosphatase activity in immunoassays. In Western blotting, it visualizes protein bands by forming a blue precipitate where AP-conjugated antibodies bind. This combination is also pivotal in ELISA for quantifying antigens or antibodies. In nucleic acid detection, BCIP/NBT is employed for non-radioactive labeling in Southern and Northern blots. Histological applications include immunohistochemistry (IHC) and in situ hybridization (ISH), where it localizes proteins or RNA/DNA sequences in tissue sections. Its versatility extends to phage display and colony lift assays, making it indispensable in molecular biology workflows.
Safety and Storage
BCIP requires careful handling due to its irritant properties. Laboratory personnel should wear gloves, goggles, and protective clothing to avoid skin or eye contact. Inhalation of powder should be prevented by working in a fume hood. For long-term stability, BCIP must be stored at -20°C in airtight, light-resistant containers. Desiccants are recommended to mitigate moisture absorption. Prepared solutions should be used immediately or stored briefly at 4°C. Disposal must comply with local regulations for organic bromine/chlorine compounds, typically through licensed hazardous waste services.
B2B Procurement Guide
When sourcing BCIP, prioritize suppliers with documented quality control, such as ISO 13485 or GMP certification. Request certificates of analysis (CoA) to verify purity (>98%) and absence of contaminants like heavy metals. Batch-to-batch consistency is critical for reproducible assay results. Bulk purchases (e.g., 10–100 grams) often reduce costs for high-throughput labs. Consider lead times and cold-chain logistics to ensure product integrity during transit. Some vendors offer custom formulations, such as ready-to-use BCIP/NBT solutions, which streamline workflow but may command a premium. For reference, pricing ranges from $50–$200 per gram, depending on quantity and supplier tier.
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