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Phosphate-buffered saline (PBS) is a buffer solution (pH ~ 7.4) commonly used in biological research. It is a water-based salt solution containing disodium hydrogen phosphate , sodium chloride and, in some formulations, potassium chloride and potassium dihydrogen phosphate .
The majority of biological samples that are used in research are kept in a buffer solution, often phosphate buffered saline (PBS) at pH 7.4. In industry, buffering agents are used in fermentation processes and in setting the correct conditions for dyes used in colouring fabrics. They are also used in chemical analysis [5] and calibration of pH ...
Hanks' salts is a collective group of salts rich in bicarbonate ions, formulated in 1940 by the microbiologist John H. Hanks. [1] Typically, they are used as a buffer system in cell culture media and aid in maintaining the optimum physiological pH (roughly 7.0–7.4) for cellular growth.
McIlvaine buffer is a buffer solution composed of citric acid and disodium hydrogen phosphate, also known as citrate-phosphate buffer.It was introduced in 1921 by the United States agronomist Theodore Clinton McIlvaine (1875–1959) from West Virginia University, and it can be prepared in pH 2.2 to 8 by mixing two stock solutions.
In the case of a phosphate buffer, substantial quantities of weak acid and conjugate weak base (H 2 PO 4 – and HPO 4 2–) can accept or donate protons accordingly in order to conserve intracellular pH: [13] [14] OH – + H 2 PO 4 – ⇌ H 2 O + HPO 4 2– H + + HPO 4 2– ⇌ H 2 PO 4 –
0.2M cacodylate buffer, pH 7.4, 20.0 ml; Mix the paraformaldehyde with 25 ml of distilled water in a 125 ml Erlenmeyer flask. Heat to 60 °C on a stir plate. When moisture forms on the sides of flask, add sodium hydroxide and stir until the solution clears. Cool solution under the faucet. Filter, add glutaraldehyde and 0.2M buffer, pH range 7.2 ...
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