What is the molecular weight of phosphate buffer?
411.04
Phosphate-Buffered Saline
| PubChem CID | 24978514 |
|---|---|
| Molecular Weight | 411.04 |
| Component Compounds | CID 313 (Hydrochloric acid) CID 1004 (Phosphoric acid) CID 5360545 (Sodium) CID 5462222 (Potassium) |
| Dates | Modify 2021-11-20 Create 2008-10-27 |
What does sodium azide do in a buffer?
The sodium azide is a preservative preventing the microbial growth in the buffer. It can be excluded from the buffer without affecting the performance of the assay.
How do you calculate phosphate buffer?
The requirement is for a 0.1 M Na-phosphate buffer, pH 7.6. In the Henderson-Hasselbalch equation, pH = pKa + log ([salt] / [acid]), the salt is Na2HPO4 and the acid is NaHzPO4. A buffer is most effective at its pKa, which is the point where [salt] = [acid].
Why do you add sodium azide to the 0 sample?
To prevent microbial contamination, sodium azide can be added to an antibody preparation for example to a final concentration of 0.02% (w/v) but if you are staining or treating live cells with antibodies, or if using antibodies for in vivo studies, be sure to use preparations that do not contain sodium azide.
How do you make sodium phosphate buffer?
- Prepare 800 mL of distilled water in a suitable container.
- Add 20.214 g of Na2HPO4•7H2O to the solution.
- Add 3.394 g of NaH2PO4•H2O to the solution.
- Adjust solution to final desired pH using HCl or NaOH.
How much sodium azide is in a buffer?
PBS with azide is also useful as a storage buffer. Ready to use PBS with Azide buffer is a solution with a phosphate buffer concentration of 0.01M, 0.027M potassium chloride, 0.137M sodium chloride, and 1.76 mM potassium phosphate with 0.02% sodium azide.
Why is sodium azide often added to the storage buffer?
Sodium azide is commonly used as an antimicrobial… Adding NaN3 will prevent the contamination and prolong the useful life of the reactor.
How do you make 10X PBS to 1X PBS?
To prepare a 1 liter working solution of 1X PBS from a 10X PBS solution, add 100 ml of the 10X solution to 900 ml of water. This only changes the concentration of the solution, not the gram or molar amount of the reagents. The pH should be unaffected.
What is the difference between 1X PBS and 10X PBS?
standard 0.01M PBS (1x) has only 10mM of phosphates but a lot of NaCl and usually some KCl, totalling osmolarity close to saline. 10x pbs can result in the cell shrinking or swelling of the cells which will eventually distort the cell morphology that will lead to the discrepancy in IF protocol.
Is sodium phosphate buffer autoclavable?
Autoclave and store at room temperature.
