7365-45-9

Basic information

• Product Name: HEPES
• Synonyms: 4-(2-hydroxyethyl)-1-piperazineethanesulfonicaci;hepesfreeacid;4-(2-HYDROXYETHYL)-1-PIPERAZINEETHANESULFONIC ACID;4-(2-HYDROXYETHYL)PIPERAZINE-1-ETHANESULFONIC ACID;2-[4-(2-HYDROXYETHYL)-1-PIPERAZINE]ETHANESULFONIC ACID;2-[4-(2-HYDROXYETHYL)-1-PIPERAZINYL]ETHANESULFONIC ACID;LABOTEST-BB LT00138109;LABOTEST-BB LT00233156
• CAS NO: 7365-45-9
• Molecular Formula: C₈H₁₈N₂O₄S
• Molecular Weight: 238.3
• EINECS: 230-907-9
• Product Categories: Biochemistry;Good's Buffers;Buffer;ReagentsBiological Buffers;AlphabeticalMolecular Biology;Biological Buffers;BioUltra Buffers;BioUltraMolecular Biology;DNA&RNA Purification;Molecular Biology Reagents;Zwitterionic
• Mol File: 7365-45-9.mol
• Article Data: 10

Chemical Properties

• Melting Point: 234-238 °C
• Boiling Point: 408℃[at 101 325 Pa]
• Appearance: White/powder
• Density: 1.07 g/mL at 20 °C
• Vapor Pressure: 0Pa at 25℃
• Refractive Index: n20/D 1.339
• Storage Temp.: 2-8°C
• Solubility: H2O: 1 M at 20 °C, clear, colorless
• PKA: 7.5(at 25℃)
• Water Solubility: Soluble
• Stability: Stable. Combustible. Incompatible with strong oxidizing agents. Protect from moisture.
• Merck: 14,4654
• BRN: 883043
• CAS DataBase Reference: HEPES(CAS DataBase Reference)
• NIST Chemistry Reference: HEPES(7365-45-9)
• EPA Substance Registry System: HEPES(7365-45-9)

Safety Data

• Hazard Codes: Xi
• Statements: 36/37/38
• Safety Statements: 24/25-22-36-26
• WGK Germany: 1
• RTECS: TL6809000
• TSCA: Yes
• Hazardous Substances Data: 7365-45-9(Hazardous Substances Data)

Usage

Description

HEPES has been described as one of the best all-purpose buffers available for biological research. At biological pH, the molecule is zwitterionic, and is effective as a buffer at pH 6.8 to 8.2 (pKa 7.55). It is typically used in cell culture at concentration between 5mM to 30 mM. HEPES has been used in a wide variety of applications, including tissue culture. It is commonly used to buffer cell culture media in air. HEPES finds its usage in in vitro experiments on Mg.

Chemical Properties

White crystalline powder

Uses

Different sources of media describe the Uses of 7365-45-9 differently. You can refer to the following data:
1. Non-toxic to cell. It is used as a hydrogen ion buffer, which can control the constant pH range for long term. The concentration is 10-50mmol/L. Generally, 20mmol/LHEPES in nutrient solution can get buffer ability.
2. HEPES is common buffer for biological sciences, particularly used in cell culture to maintain physiological pH. It acts a buffering component, which is used in the preparation of buffers. It is described as one of the best all-purpose buffers available for use in biological research.HEPES has been used as a component of:Hank′s balanced salt solution, Dulbecco′s modified eagle′s medium and no-glucose DMEM, which are used for the preparation of tissue slices.Buffers used in localized conductance measurements on the basolateral side of culture inserts to examine cation selectivity.

Definition

ChEBI: A HEPES that is ethanesulfonate substituted by a 4-(2-hydroxyethyl)piperazin-4-ium-1-yl group at position 2.

General Description

HEPES buffered saline is a tissue culture buffer, which is used to maintain the pH of cell culture. It is water soluble and atmosphere independent. HEPES destroys magnesium in sodium chloride solutions.

Biological Activity

Different sources of media describe the Biological Activity of 7365-45-9 differently. You can refer to the following data:
1. HEPES is a multi purpose HEPES buffer used in cell culture and other biological research. Working pH range in aqueous solution: 6.8 - 8.2. Does not form complexes with metal ions. Used in cell culture media.
2. Multi purpose buffer used in biological research.

Purification Methods

Crystallise the acid from hot EtOH and water. It is a useful buffer. [Beilstein 23 V 376.]

InChI:InChI=1/C8H18N2O4S/c11-7-5-9-1-3-10(4-2-9)6-8-15(12,13)14/h11H,1-8H2,(H,12,13,14)/p+1

Synthetic route

1-(2-hydroxyethyl)piperazine (103-76-4) + sodium 2-hydroxyethanesulfonate (1562-00-1) → N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid (7365-45-9)

Conditions	Yield
Stage #1: 1-(2-hydroxyethyl)piperazine; sodium 2-hydroxyethanesulfonate In methanol at 50℃; for 5.5h; Stage #2: With 5percent by weight of raffinate In water Solvent; Temperature;	85.6%

1-(2-hydroxyethyl)piperazine (103-76-4) + Na-salt of 2-chloroethane-1-sulfonic acid (15484-44-3) → N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid (7365-45-9)

Conditions	Yield
In water at 85 - 105℃; for 0.5h; pH=10; Temperature;	84.7%

1-(2-hydroxyethyl)piperazine (103-76-4) + ammonium vinylsulfonate (86761-62-8) → N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid (7365-45-9)

Conditions	Yield
Stage #1: 1-(2-hydroxyethyl)piperazine; ammonium vinylsulfonate In water at 60℃; for 4h; Stage #2: With sulfuric acid at 0℃; for 1h;

1-(2-hydroxyethyl)piperazine (103-76-4) + sodium vinylsulfonate (3039-83-6) → N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid (7365-45-9)

Conditions	Yield
Stage #1: 1-(2-hydroxyethyl)piperazine; sodium vinylsulfonate In water at 60 - 120℃; for 3h; Stage #2: With oxalic acid at 20℃; for 1h; Temperature; Reagent/catalyst;

1-(2-hydroxyethyl)piperazine (103-76-4) + potassium vinyl sulfonate (7308-65-8) → N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid (7365-45-9)

Conditions	Yield
Stage #1: 1-(2-hydroxyethyl)piperazine; potassium vinyl sulfonate In water at 50℃; for 3.5h; Stage #2: With sulfuric acid at 40℃; for 1h;

1-(2-hydroxyethyl)piperazine (103-76-4) + ethenesulfonic acid (1184-84-5) → N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid (7365-45-9)

Conditions	Yield
Stage #1: 1-(2-hydroxyethyl)piperazine; ethenesulfonic acid With sodium hydroxide In water at 40℃; for 3.5h; Stage #2: With oxalic acid at 20℃; for 1h; Temperature; Reagent/catalyst;

1,1′-(1,4-butanediyl)bis(2-methylbenzimidazole) (1059536-93-4) + silver carbonate + N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid (7365-45-9) → [Ag2(N-(2-hydroxyethyl)piperazine-N'-(2-ethanesulfonate))(1,1'-(1,4-butanediyl)bis(2-methylbenzimidazole))]*2H2O

Conditions	Yield
In ethanol mixt. of Ag salt, acid and imidazole ligand was stirred at room temp. for 30 min; ammonia added dropwise; slowly evapd. at room temp.; elem. anal.;	68%

2,3,4,5-tetrahydro-2-oxo-1,5-ethanolbenzazepine (102586-88-9) + N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid (7365-45-9) → (N,N-dimethylamino)ethyl 1,2,3,4-tetrahydroquinoline-4-propanoate (104876-18-8)

Conditions	Yield
In water at 25℃; Rate constant;

N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid (7365-45-9) → Glyoxal (131543-46-9) + 2-[2-(2-Hydroxy-ethylamino)-ethylamino]-ethanesulfonic acid

Conditions	Yield
With (batho)2CuII (batho = 2,9-dimethyl-4,7-diphenyl-1,10-phenanthrolinedisulfonate); water at 25℃; for 24h; Rate constant; Mechanism; pH 8; other substituted ethylenediamine;

deoxyguanosine 5'-monophosphate 2-methylimidazolide + N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid (7365-45-9) → 2'-deoxyguanosine 5'-monophosphate (902-04-5) + 2-[4-(2-{[(2R,3S,5R)-5-(2-Amino-6-oxo-1,6-dihydro-purin-9-yl)-3-hydroxy-tetrahydro-furan-2-ylmethoxy]-hydroxy-phosphoryloxy}-ethyl)-piperazin-1-yl]-ethanesulfonic acid + C20H24N10O13P2(2-) + C30H35N15O19P3(3-)

Conditions	Yield
With sodium chloride; magnesium chloride; polycytidylate In water at 23℃; for 480h; pH=7.85; Kinetics; Product distribution; Further Variations:; Reagents; Condensation; dimerization; oligomerization; hydrolysis;

C15H18ClMnN3O3 (1313369-50-4) + N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid (7365-45-9) → C8H17N2O4S(1-)*C15H16N3O2(1-)*Mn(2+)

Conditions	Yield
With sodium carbonate; sodium chloride In water at 25℃; pH=7.4;

zinc diacetate (557-34-6) + N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid (7365-45-9) → zinc(II) oxide

Conditions	Yield
With sodium hydroxide In water at 110℃; for 0.283333h; pH=7.4; pH-value; Concentration; Reagent/catalyst; Sonication; Microwave irradiation;

zinc(II) chloride (7646-85-7) + N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid (7365-45-9) → zinc hydroxide chloride hydrate

Conditions	Yield
With sodium hydroxide In water at 110℃; for 0.283333h; pH=7.4; Sonication; Microwave irradiation;

N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid (7365-45-9) + 1-ethyl-3-methylimidazolium hydroxide → C6H11N2(1+)*C8H17N2O4S(1-) (1612259-40-1)

Conditions	Yield
In water at 20℃; for 12h;

tetramethyl ammoniumhydroxide (75-59-2) + N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid (7365-45-9) → C4H12N(1+)*C8H17N2O4S(1-) (79661-24-8)

Conditions	Yield
In water at 20℃; for 12h;

tetraethylammonium hydroxide (77-98-5) + N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid (7365-45-9) → C8H20N(1+)*C8H17N2O4S(1-) (79661-25-9)

Conditions	Yield
In water at 20℃; for 12h;

tetra(n-butyl)ammonium hydroxide (2052-49-5) + N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid (7365-45-9) → 2-[4-(2-Hydroxy-ethyl)-piperazin-1-yl]-ethanesulfonatetetrabutyl-ammonium; (113599-06-7)

Conditions	Yield
In water at 20℃; for 12h;

cholin hydroxide (123-41-1) + N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid (7365-45-9) → cholinium 2-[4-(2-hydroxyethyl)piperazin-1-yl]ethanesulfonate

Conditions	Yield
In aq. buffer for 12h;

dATP (1927-31-7) + N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid (7365-45-9) → C18H30N7O9PS

Conditions	Yield
With apelin-12; thermococcus kodakaraensis primase protein; magnesium acetate; serum albumin In glycerol at 70℃; for 0.5h; Enzymatic reaction;

C10H13N2O8(3-)*2Na(1+)*H(1+) + C25H22N4O5Zn + N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid (7365-45-9) → 6,6'-((1E,1'E)-((2E,2'E)-((2-hydroxy-5-methyl-1,3-phenylene)bis(methanylylidene))bis(hydrazine-2,1-diylidene))bis(methanylylidene))bis(3-methoxyphenol)

Conditions	Yield
In water; dimethyl sulfoxide pH=7.2;

C10H13N2O8(3-)*2Na(1+)*H(1+) + C25H23CdN4O5(1+) + N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid (7365-45-9) → 6,6'-((1E,1'E)-((2E,2'E)-((2-hydroxy-5-methyl-1,3-phenylene)bis(methanylylidene))bis(hydrazine-2,1-diylidene))bis(methanylylidene))bis(3-methoxyphenol)

Conditions	Yield
In water; dimethyl sulfoxide pH=7.2;

C13H16N8O6P(1-) + 5'-adenosine monophosphate (61-19-8) + N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid (7365-45-9) → C18H29N7O10PS(1-) + C23H28N13O12P2(1-) + P1,P2-diadenosine-5’-diphosphate

Conditions	Yield
Stage #1: 5'-adenosine monophosphate With hydrogenchloride; sodium hydroxide In water pH=5.5; Stage #2: C13H16N8O6P(1-); N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid With methyl isocyanate; acetaldehyde; magnesium chloride for 16h; pH=8; Inert atmosphere;

Upstream product

• 103-76-4 1-(2-hydroxyethyl)piperazine 
• 15484-44-3 Na-salt of 2-chloroethane-1-sulfonic acid 
• 1184-84-5 ethenesulfonic acid 
• 7308-65-8 potassium vinyl sulfonate 
• 3039-83-6 sodium vinylsulfonate 
• 86761-62-8 ammonium vinylsulfonate 
• 1562-00-1 sodium 2-hydroxyethanesulfonate 

Downstream Products

• 902-04-5 2'-deoxyguanosine 5'-monophosphate 

Relevant articles and documents

Preparation method of piperazine ethanesulfonic acid derivative (by machine translation)

The reaction is carried out in such a manner that the reaction proceeds relatively, more thoroughly by reducing the side, reaction of the reaction system, in a manner such that the reaction proceeds relatively more thoroughly from, the system to 2 - a certain extent 2 - by reducing the reaction proceeds, to relatively more thoroughly; NaOH, NaCl, and. (by machine translation)

Method for preparing high-purity 4-hydroxyethylpiperazine ethanesulfonic acid

The invention belongs to the technical field of preparation of organic matters, and relates to a method for preparing high-purity 4-hydroxyethylpiperazine ethanesulfonic acid. The method sequentially comprises the following specific steps: preparation of 4-hydroxyethylpiperazine ethanesulfonate, acidizing, extraction for decolorizing and removing impurities, reverse extraction, nanofiltration and washing, and drying, so that the high-purity 4-hydroxyethylpiperazine ethanesulfonic acid is finally obtained. The 4-hydroxyethylpiperazine ethanesulfonic acid prepared with the method provided by the invention is high in purity; the operation process is simple and convenient; the production process is environmentally friendly; the purification cost is low; the yield is high; the method is suitable for industrial batch production.

Peptides for Treatment of Obesity

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