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Biochemical processes are markedly impaired by even small changes in the concentrations of free H+ ions.: It is therefore usually required to stabilise the H + concentration in vitro without affecting the system's functioning.
A buffer keeps the pH of a solution constant by taking up protons that are released during reactions, or by releasing protons when they are consumed by reactions.
The observation that partially neutralised solutions of weak acids or bases are resistant to changes in pH when small amounts of strong acids or bases are added led to the concept of the ‘buffer’. In the table, the most common biological buffers are listed according to their optimal buffer range.
The table also gives some hints for potential applications and shows advantages or disadvantages of the listed buffer substances.

Buffer systems described in the literature are usually used for experiments to enable direct comparison of results.
Again and again, it is shown that the conditions in experiments - even in standard systems - could be optimised.

In our Info Point "Biological Buffers" we provide a selection of important information from the literature that might help you in solving your everyday problems as well as give recommendations for the development and optimization of your test systems: Which requirements do biological buffers have to fulfil? Which criteria need to be taken into account? How is the pH value adjusted effectively?

Catalog	Description	Packaging	Specification
A3837	TE buffer (1X) pH 7.5	1 L	pH (20°C; adjusted with HCl): 7.5 ± 0.1 Composition: EDTA-Na2 · 2H2O: 0.372 g/L (1 mM) Tris: 1.211 g/L (10 mM)
A3802	Sodium Acetate solution 3 mol/l (3 M, pH 5.2)	500 ml	pH (20°C): 5.2 ± 0.1 Composition: Sodium Acetate: 408.24 g/L
A3635	Imidazole ultrapure 288-32-4	100 g / 250 g	CAS No. 288-32-4 / Solid / M.W 68.08 g/mol
A3485	Ammonium Sulfate for molecular biology 7783-20-2	1 kg / 5 kg	CAS No. 7783-20-2 / Solid / M.W 132.14 g/mol
A2264	Tris for molecular biology 77-86-1	250 g / 500 g / 1 kg / 5 kg / 25 kg	CAS No. 77-86-1 / Solid / M.W 121.14 g/mol
A2140	Cacodylic Acid Sodium Salt 3-hydrate BioChemica 6131-99-3	100 g / 250 g	CAS No. 6131-99-3 / Solid / M.W 214.03 g/mol
A1691	TAE buffer (50X)	500 ml / 1 L	pH (20°C; H2O): 8.5 ± 0.2 Composition: EDTA · Na2 · 2H2O: 18.61 g/L (0.05 M) Acetic Acid glacial: 60.05 g/L (1 M) Tris: 242.28 g/L (2 M)
A1416	TAE buffer (10X)	1 L	pH (20°C; H2O): 8.5 ± 0.2 Composition: EDTA · NA2 · 2H2O: 3.72 g/L (0.01 M) Acetic acid glacial: 12.01 g/L (0.20 M) Tris: 48.46 g/L (0.40 M)
A1396	SSC buffer (20X) for molecular biology	1 L	DNases/RNases/Proteases: not detectable pH (20°C; adjusted with HCl): 7.0 ± 0.2 Composition: tri-Sodium Citrate: 88.23 g/L (0.3 M) Sodium Chloride: 175.32 g/L (3 M)
A1379	Tris for buffer solutions 77-86-1	500 g / 1 kg / 5 kg / 10 kg	CAS No. 77-86-1 / Solid / M.W 121.14 g/mol

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