HEPPSO is a zwitterionic buffer. The working pH range of HEPPSO buffer is 7.1-8.5. HEPPSO shows a high ability to bind copper(II) with a pKa value of 7.84 at 2.0 mM buffer concentration.

Physicochemical Properties

Molecular Formula	C9H20N2O5S
Molecular Weight	268.33
Exact Mass	268.109
CAS #	68399-78-0
PubChem CID	100205
Appearance	White to off-white solid powder
Density	1.4±0.1 g/cm3
Melting Point	158-160°C
Index of Refraction	1.561
LogP	-2.59
Hydrogen Bond Donor Count	3
Hydrogen Bond Acceptor Count	7
Rotatable Bond Count	6
Heavy Atom Count	17
Complexity	308
Defined Atom Stereocenter Count	0
SMILES	S(C([H])([H])C([H])(C([H])([H])N1C([H])([H])C([H])([H])N(C([H])([H])C([H])([H])O[H])C([H])([H])C1([H])[H])O[H])(=O)(=O)O[H]
InChi Key	GIZQLVPDAOBAFN-UHFFFAOYSA-N
InChi Code	InChI=1S/C9H20N2O5S/c12-6-5-10-1-3-11(4-2-10)7-9(13)8-17(14,15)16/h9,12-13H,1-8H2,(H,14,15,16)
Chemical Name	2-hydroxy-3-[4-(2-hydroxyethyl)piperazin-1-yl]propane-1-sulfonic acid
HS Tariff Code	2934.99.9001
Storage	Powder-20°C 3 years 4°C 2 years In solvent -80°C 6 months -20°C 1 month
Shipping Condition	Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs)

Biological Activity

References

[1]. Vasconcelos MT, et, al. Copper(II) complexation properties and surfactant activity of 3-[N, N-bis(2-hydroxyethyl)amino]-2-hydroxypropanesulfonic acid and N-(2-Hydroxyethyl)piperazine-N'-2-hydroxypropanesulfonic acid pH buffers which may affect trace metal speciation in in vitro studies. Anal Biochem. 1998 Dec 15; 265(2): 193-201. [2]. Mash HE, et, al. Complexation of copper by zwitterionic aminosulfonic (good) buffers. Anal Chem. 2003 Feb 1; 75(3): 671-7.

Additional Infomation

HEPPSO is a N-(2-hydroxyethyl)piperazine and a N-(sulfoalkyl)piperazine.

Solubility Data

Solubility (In Vitro)

H2O: 250 mg/mL (931.69 mM) DMSO: 250 mg/mL (931.69 mM)

Solubility (In Vivo)

Solubility in Formulation 1: ≥ 4.17 mg/mL (15.54 mM) (saturation unknown) in 10% DMSO + 40% PEG300 + 5% Tween80 + 45% Saline (add these co-solvents sequentially from left to right, and one by one), clear solution. For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 41.7 mg/mL clear DMSO stock solution to 400 μL PEG300 and mix evenly; then add 50 μL Tween-80 to the above solution and mix evenly; then add 450 μL normal saline to adjust the volume to 1 mL. Preparation of saline: Dissolve 0.9 g of sodium chloride in 100 mL ddH₂ O to obtain a clear solution. Solubility in Formulation 2: ≥ 4.17 mg/mL (15.54 mM) (saturation unknown) in 10% DMSO + 90% (20% SBE-β-CD in Saline) (add these co-solvents sequentially from left to right, and one by one), clear solution. For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 41.7 mg/mL clear DMSO stock solution to 900 μL of 20% SBE-β-CD physiological saline solution and mix evenly. Preparation of 20% SBE-β-CD in Saline (4°C，1 week): Dissolve 2 g SBE-β-CD in 10 mL saline to obtain a clear solution. Solubility in Formulation 3: ≥ 4.17 mg/mL (15.54 mM) (saturation unknown) in 10% DMSO + 90% Corn Oil (add these co-solvents sequentially from left to right, and one by one), clear solution. For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 41.7 mg/mL clear DMSO stock solution to 900 μL of corn oil and mix evenly. Solubility in Formulation 4: ≥ 2.5 mg/mL (9.32 mM) (saturation unknown) in 10% DMSO + 40% PEG300 + 5% Tween80 + 45% Saline (add these co-solvents sequentially from left to right, and one by one), clear solution. For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 25.0 mg/mL clear DMSO stock solution to 400 μL PEG300 and mix evenly; then add 50 μL Tween-80 to the above solution and mix evenly; then add 450 μL normal saline to adjust the volume to 1 mL. Preparation of saline: Dissolve 0.9 g of sodium chloride in 100 mL ddH₂ O to obtain a clear solution. Solubility in Formulation 5: ≥ 2.5 mg/mL (9.32 mM) (saturation unknown) in 10% DMSO + 90% (20% SBE-β-CD in Saline) (add these co-solvents sequentially from left to right, and one by one), clear solution. For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 25.0 mg/mL clear DMSO stock solution to 900 μL of 20% SBE-β-CD physiological saline solution and mix evenly. Preparation of 20% SBE-β-CD in Saline (4°C，1 week): Dissolve 2 g SBE-β-CD in 10 mL saline to obtain a clear solution. Solubility in Formulation 6: ≥ 2.5 mg/mL (9.32 mM) (saturation unknown) in 10% DMSO + 90% Corn Oil (add these co-solvents sequentially from left to right, and one by one), clear solution. For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 25.0 mg/mL clear DMSO stock solution to 900 μL of corn oil and mix evenly. Solubility in Formulation 7: 110 mg/mL (409.94 mM) in PBS (add these co-solvents sequentially from left to right, and one by one), clear solution; with ultrasonication.  (Please use freshly prepared in vivo formulations for optimal results.)

Preparing Stock Solutions		1 mg	5 mg	10 mg
	1 mM	3.7268 mL	18.6338 mL	37.2675 mL
	5 mM	0.7454 mL	3.7268 mL	7.4535 mL
	10 mM	0.3727 mL	1.8634 mL	3.7268 mL

*Note: Please select an appropriate solvent for the preparation of stock solution based on your experiment needs. For most products, DMSO can be used for preparing stock solutions (e.g. 5 mM, 10 mM, or 20 mM concentration); some products with high aqueous solubility may be dissolved in water directly. Solubility information is available at the above Solubility Data section. Once the stock solution is prepared, aliquot it to routine usage volumes and store at -20°C or -80°C. Avoid repeated freeze and thaw cycles.