How many WB films can be made from 1g packaged chemiluminescence substrate?

This cannot be generalized, it depends on the formula and the type of luminescent substrate. Taking the common Luminol/enhancer self-adhesive ECL as an example, 1g Luminol can theoretically prepare thousands of mL of working solution; Based on the requirement of 8-12mL of working fluid for each film, 8-10 films are needed per week, and a 1g specification is usually sufficient for several months. But if 1g in the formula is a mixture of A/B powders or requires high concentration enhancers, the actual volume that can be prepared will be reduced. It is recommended to calculate the molar concentration based on the literature formula after receiving it, rather than just estimating based on quality. Prepare the working fluid into small bottles before use to avoid diluting too much at once.

Chemiluminescent substrate powders may involve ordinary chemicals or require dry ice shipping, and customs declaration depends on the specific CAS number and packaging. For imported small-pack sizes, lead times are commonly 2–6 weeks. Powders generally carry lower shipping risk than ready-to-use liquids, but some enhancers are moisture-sensitive and prone to oxidation, so upon arrival confirm there is no caking or discoloration inside the bottle. Domestic manufacturers generally have shorter lead times and prices may be lower than imported products, but batch-to-batch consistency and background performance need to be tested. When purchasing, ask clearly about storage conditions, whether hazardous goods declaration is required, and whether third-party or factory quality inspection reports can be provided. A 1 g small pack is suitable for initial trial runs; bulk stocking without validation is not recommended.

Self-prepared ECL working solution stored at 4°C protected from light is generally stable for 1–2 weeks, but stability varies greatly with different enhancers and buffers. Solution A and Solution B should preferably be stored separately in brown bottles and mixed only immediately before use; the mixed working solution should be used the same day if possible, or at most kept overnight at 4°C. If there is obvious yellowing, increased background on blank membranes, or attenuated band signal, it should no longer be used for quantitative comparison. A more reliable approach is to aliquot the prepared stock solutions and store them frozen at -20°C to avoid repeated freeze-thaw cycles, test each newly prepared batch with the same positive control, and record the lot number of the ECL substrate.

The difference between conventional abundance protein self prepared powder and ready to use type is not significant, and proper operation can meet most internal reference and overexpression detection needs; Low abundance or phosphorylated antibodies, ready to use types typically have lower background and more stable signals. The advantages of self configuration are adjustable exposure time and high cost elasticity, while the disadvantages are water quality pH、 The purity of the enhancer affects repeatability. If you have 8-10 films per week and strive for batch consistency, it is recommended to fix the formula and raw materials of the self-made mother liquor and conduct a parallel comparison with the ready to use type; If low abundance bands often cannot be captured, keep a bottle of high sensitivity ready to use emergency medicine instead of self matching them all.