What Is 2,4-Epibrassinolide Stock Solution and Why Use a Pre-Made Format?

2,4-Epibrassinolide is a naturally occurring brassinosteroid — a class of polyhydroxylated steroidal phytohormones that regulate a broad range of plant developmental processes, including cell elongation, division, photomorphogenesis, and stress tolerance. It is among the most biologically active brassinosteroids characterized to date.

Because the neat compound is a waxy solid with limited aqueous solubility, preparing reproducible stock solutions from powder requires careful choice of solvent (typically ethanol or DMSO) followed by serial dilution into aqueous media. These steps introduce variability and contamination risk. Aladdin Scientific's pre-made 1 mg/mL sterile stock solution removes these hurdles: the compound is already dissolved, filter-sterilized, and ready for direct dilution into plant growth media, hydroponic solutions, or cell culture buffers, saving preparation time and improving inter-experiment reproducibility.

Storage, Stability, and Handling Guidelines

To preserve biological activity and solution integrity, observe the following handling practices:

• Temperature: Store at −20 °C upon receipt. Avoid repeated freeze-thaw cycles; consider preparing single-use aliquots.
• Light: Protect from prolonged light exposure; brassinosteroids can be sensitive to photodegradation.
• Container integrity: Keep the vial tightly sealed when not in use to prevent solvent evaporation and microbial ingress.
• Working solutions: Prepare fresh dilutions in sterile media immediately before use where possible. If pre-diluted working solutions must be stored, keep at 4 °C and use within the timeframe validated for your application.
• Sterile technique: When adding to sterile plant tissue culture media, work inside a laminar-flow hood to maintain sterility.

Note: Specific validated shelf-life data for this formulation should be confirmed with Aladdin Scientific technical support or the product datasheet.

Dilution and Application Protocols

The 1 mg/mL stock solution is intended to be diluted to nanomolar or micromolar working concentrations appropriate for plant physiology experiments. Typical working concentration ranges reported in the brassinosteroid literature span from approximately 0.01 nM to 10 µM depending on the species, tissue, and assay type; however, researchers should optimize concentrations empirically for their specific experimental system.

Example dilution calculation: To prepare 10 mL of a 1 µM working solution from the 1 mg/mL stock (molecular weight of 2,4-epibrassinolide ≈ 480.7 g/mol, giving a stock molarity of approximately 2.08 mM): add approximately 4.8 µL of stock solution to 9.995 mL of sterile medium and mix thoroughly.

Always verify the molecular weight from the product datasheet and recalculate accordingly. These values are provided as illustrative guidance and should be confirmed before use.

Common applications include: seedling elongation bioassays, hypocotyl growth assays, stomatal regulation studies, abiotic stress tolerance experiments, and brassinosteroid receptor binding or signaling pathway studies in model plants such as Arabidopsis thaliana.

Quality, Purity, and Sterility Assurance

Aladdin Scientific's 2,4-Epibrassinolide Stock Solution is prepared from high-purity 2,4-epibrassinolide and rendered sterile by filtration through a validated membrane filter (typically 0.2 µm), making it suitable for use in sterile plant tissue culture and cell-based assay environments.

Researchers requiring specific purity certificates, analytical data (e.g., HPLC purity, NMR confirmation), or batch-specific documentation should request a Certificate of Analysis (CoA) from Aladdin Scientific at the time of ordering or upon receipt. The CoA provides lot-specific quality data essential for GLP-compliant research records.

Specific purity percentages and analytical test results are batch-dependent; contact Aladdin Scientific technical support for the most current CoA for SKU E1528123.

Ordering, Packaging, and Regulatory Information

2,4-Epibrassinolide Stock Solution (1 mg/mL, Sterile) is available from Aladdin Scientific under SKU E1528123. To place an order, contact your regional Aladdin Scientific representative, use the online catalog, or reach out to the customer service team for bulk or custom volume inquiries.

Shipping: As a solution containing organic solvent, this product may be classified as a flammable or regulated material depending on formulation. Shipping conditions (e.g., dry ice, cold pack) and any applicable transport regulations will be determined at the time of order. Please refer to the Safety Data Sheet (SDS) for hazard classification, first-aid measures, and disposal information.

Returns and quality concerns: If the product arrives damaged or does not meet quality specifications, contact Aladdin Scientific customer service promptly with your order number and lot number to initiate a return or replacement under the applicable returns policy.