Question

How many Good's buffer agents exist?

Answer 1

There are 20 Good buffers.

Explanation:

Named after Norman Good, they are all physiological buffers with `"p"K_a` values ranging from 6.1 to 8.5.

The buffers, with their `"p"K_a` values, are:

1. MES: `"2-("N"-morpholino)ethanesulfonic acid"`, 6.15

2. ADA: `N"-(2-acetamido)iminodiacetic acid"`, 6.62

3. PIPES: `"piperazine-"N,N′"-bis(2-ethanesulfonic acid)"`, 6.82

4. ACES: `N"-(2-acetamido)-2-aminoethanesulfonic acid"`, 6.88

5. MOPSO: `"3-("N"-morpholinyl)-2-hydroxypropanesulfonic acid"`, 6.95

6. Cholamine chloride: `("CH"_3)_3 stackrel(+)("N")"CH"_2"CH"_2"NH"_2, "Cl"^"-"`, 7.10

7. BES: `N,N"-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid"`, 7.17

8. MOPS: `"3-("N"-morpholino)propanesulfonic acid"`, 7.20

9. TES: `N"-[tris(hydroxymethyl)methyl]-2-aminoethanesulfonic acid"`, 7.40

10. HEPES: `"4-(2-hydroxyethyl)-1-piperazinylethanesulfonic acid"`, 7.48

11. DIPSO: `N,N"-bis(2-hydroxyethyl)-3-amino-2-hydroxypropanesulfonic acid"`, 7.60

12. TAPSO:`"3-["N"-tris(hydroxymethyl)methylamino]-2-hydroxypropanesulfonic acid"`, 7.60

13. Acetamidoglycine: `"CH"_3"CONHNHCH"_2"COOH"`, 7.7

14. POPSO: `"piperazine-"N,N′"-bis(2-hydroxypropanesulfonic acid)"`, 7.85

15. HEPPSO: `"4-(2-hydroxyethyl)piperazine-1-(2-hydroxypropanesulfonic acid)"`, 7.85

16. HEPPS: `"3-[4-(2-hydroxyethyl)-1-piperazinyl]propanesulfonic acid"`, 8.00

17. Tricine: `N"-[tris(hydroxymethyl)methyl)]glycine"`, 8.15

18. Glycinamide: `"NH"_2"CH"_2"CONH"_2`, 8.20

19. Bicine: `N,N"-bis(2-hydroxyethyl)glycine"`, 8.35

20. TAPS: `N"-tris(hydroxymethyl)methyl-3-aminopropanesulfonic acid"`, 8.44