Buffers and Standards
Hydrogen ion buffers comprising a mixture of a weak acid and its conjugate base or vice-versa and used to stabilize pH; also diluents, washing solutions, and standard-value solutions used for a broad array of scientific calibration purposes.
The buffers used to calibrate pH meters may be certified and/or traceable to the National Institute of Standards and Technology (NIST). These buffers may also be color-coded for easy identification:
- Red: pH 4.0
- Yellow: pH 7.0
- Blue: pH 10.0
Potassium Chloride Conductivity Standard, 1000 μS/cm at 25°C, Ricca Chemical
CAS: 7447-40-7 Molecular Formula: ClK Molecular Weight (g/mol): 74.55 MDL Number: MFCD00011360 InChI Key: WCUXLLCKKVVCTQ-UHFFFAOYSA-M PubChem CID: 4873 ChEBI: CHEBI:32588 IUPAC Name: potassium chloride SMILES: [Cl-].[K+]
Thermo Scientific Chemicals HEPES, 1.0M buffer soln., pH 7.5
CAS: 7365-45-9 Molecular Formula: C8H18N2O4S Molecular Weight (g/mol): 238.30 MDL Number: MFCD00006158 InChI Key: JKMHFZQWWAIEOD-UHFFFAOYSA-N PubChem CID: 23831 ChEBI: CHEBI:42334 SMILES: OCCN1CCN(CCS(O)(=O)=O)CC1
Iodine Monochloride Solution, Wijs, for Iodine Absorption Number of Fats and Oils, Ricca Chemical
CAS: 7553-56-2,64-19-7 Molecular Formula: C2H4O2 Molecular Weight (g/mol): 60.05 MDL Number: MFCD00036152 InChI Key: QTBSBXVTEAMEQO-UHFFFAOYSA-N Synonym: ethanoic acid,ethylic acid,acetic acid, glacial,methanecarboxylic acid,vinegar acid,glacial,acetasol,acide acetique,essigsaeure PubChem CID: 176 ChEBI: CHEBI:15366 IUPAC Name: acetic acid SMILES: CC(O)=O
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Gibco™ CTS™ DPBS, without calcium chloride, without magnesium chloride
Gibco Cell Therapy Systems (CTS) DPBS is the classic Dulbecco's phosphate-buffered saline. This particular formulation lacks calcium, magnesium, and phenol red.
Calcium Carbonate Standard , (1mL = 1mg CaCO3 = 0.4mg Ca), for Hardness, Certified, 1.000 ±0.010mg CaCO3/mL, LabChem™
CAS: 7647-01-0 Molecular Formula: CCaO3 Molecular Weight (g/mol): 100.09 MDL Number: MFCD00010906 InChI Key: VTYYLEPIZMXCLO-UHFFFAOYSA-L PubChem CID: 10112 ChEBI: CHEBI:3311 IUPAC Name: calcium carbonate SMILES: [Ca++].[O-]C([O-])=O
Inorganic Carbon Standard, 1000 ppm C, Ricca Chemical
CAS: 144-55-8 Molecular Formula: CHNaO3 Molecular Weight (g/mol): 84.01 MDL Number: MFCD00003528 InChI Key: UIIMBOGNXHQVGW-UHFFFAOYSA-M IUPAC Name: sodium hydrogen carbonate SMILES: [Na+].OC([O-])=O
Invitrogen™ 20X Bolt™ MOPS SDS Running Buffer
Optimized for use with Bolt™ Bis-Tris Plus gels, and are available in a variety of formats
Silica Standard, 1000 ppm SiO2 (467 ppm Si), Ricca Chemical
CAS: 6834-92-0 Molecular Formula: Na2O3Si Molecular Weight (g/mol): 122.062 InChI Key: NTHWMYGWWRZVTN-UHFFFAOYSA-N PubChem CID: 23266 ChEBI: CHEBI:60720 IUPAC Name: disodium;dioxido(oxo)silane SMILES: [O-][Si](=O)[O-].[Na+].[Na+]
Glycerin (Glycerol), 50% (v/v), Ricca Chemical
CAS: 56-81-5 Molecular Formula: C3H8O3 Molecular Weight (g/mol): 92.09 MDL Number: MFCD00004722 InChI Key: PEDCQBHIVMGVHV-UHFFFAOYSA-N Synonym: glycerol,glycerin,glycerine,1,2,3-propanetriol,glycyl alcohol,trihydroxypropane,glyceritol,propanetriol,1,2,3-trihydroxypropane,osmoglyn PubChem CID: 753 ChEBI: CHEBI:17754 IUPAC Name: propane-1,2,3-triol SMILES: OCC(O)CO
COD Standard, 1000ppm (1mL = 1mg COD) (Potassium Acid Phthalate in Water), Certified, LabChem™
CAS: 877-24-7 Molecular Formula: C8H5KO4 Molecular Weight (g/mol): 204.222 InChI Key: IWZKICVEHNUQTL-UHFFFAOYSA-M PubChem CID: 23676735 IUPAC Name: potassium;2-carboxybenzoate SMILES: C1=CC=C(C(=C1)C(=O)O)C(=O)[O-].[K+]
Gibco™ PBS, pH 7.2
Gibco PBS, pH 7.2, is a balanced salt solution widely used in various cell culture applications to maintain a stable pH and osmotic balance, making it ideal as a wash, transport, and dilution buffer.