A powder (solid salt) is stable, easy to ship and store, and flexible when you use large volumes or need your own concentration. A sterile solution is ready to use and saves weighing, pH adjustment and filtration, but it usually has a shorter shelf life and often needs cold storage. Both forms can be inquired. If you need a solution, give the concentration, pH, solvent and whether sterile filtration is required.
How to choose
- Powder: large volumes, custom concentration or pH, long-term storage.
- Solution: small volumes, strict aseptic work, fewer preparation errors.
- Stability: DTT and L-glutamine solutions do not keep well; prepare fresh or freeze in aliquots.
What to state for common items
- HEPES: free acid or sodium salt; for a stock, the concentration and pH.
- G418: potency requirement; for a solution, the concentration.
- DMSO: cell-culture sterile, molecular-biology or industrial grade.
- TMB: powder, solution or dihydrochloride.
Fields to send: inquiry checklist and COA / SDS.
Related questions
Can a sterile solution be prepared for me?
Ask on the inquiry. The specification is confirmed in the written quotation.
How should I store a solution made from powder?
Follow the reagent notes and your lab SOP. Most solutions are best aliquoted and kept cold, avoiding repeated freeze-thaw.
Inquire with the fields in this guide
CAS, salt form, grade, pack size and use. A complete note is faster to quote.
Send an inquiryFor research or industrial use only. Not for human or animal diagnosis or treatment, and not for drug or food use. Grade, pack size and lead time follow the supplier batch COA / SDS. Figures on this site are general industry references, not a factory specification.