Products > Optimize Reagents > Optimize - Buffers > Citric acid Buffer
Citric acid Buffer
Applications
- Crystallization grade Citric acid buffer for formulating screens or for optimization
Features
- Sterile filtered
- Formulated in Type 1+ ultrapure water: 18.2 megaohm-cm resistivity at 25°C, < 5 ppb Total Organic Carbon, bacteria free (<1 Bacteria (CFU/ml)), pyrogen free (<0.03 Endotoxin (EU/ml)), RNase-free (< 0.01 ng/mL) and DNase-free (< 4 pg/µL)
Description
Citric acid
Synonyms: Citric acid anhydrous
C6H8O7
HOC(COOH)(CH2COOH)2
Mr 192.13
CAS Number [77-92-9]
EC Number 201-069-1
Beilstein Registry Number 782061
Merck 14,2326
RTECS GE7350000
MDL Number MFCD00011669
Purity ≥ 99.5%
Useful pH range of citric acid as a buffer 2.2 - 6.5
pKa1 = 3.13
pKa2 = 4.76
pKa3 = 6.4
HR2-757 is titrated to pH 3.5 at 25 degrees Celsius using NaOH
Measured Conductivity Range: 28.7 - 33.3 mS/cm at 25°C
Measured Refractive Index Range: 1.36236 - 1.36329 at 20°C
Al ≤0.0005%
As ≤0.00001%
Ba ≤0.0005%
Bi ≤0.0005%
Ca ≤0.001%
Cd ≤0.0005%
Cl ≤0.0005%
Co ≤0.0005%
Cr ≤0.0005%
Cu ≤0.0005%
Fe ≤0.0005%
K ≤0.005%
Li ≤0.0005%
Mg ≤0.0005%
Mn ≤0.0005%
Mo ≤0.0005%
Na ≤0.005%
Ni ≤0.0005%
Oxalate (C2O4) ≤0.05%
Pb ≤0.0005%
PO4 ≤0.0005%
SO4 ≤0.002%
Sr ≤0.0005%
Tartrate (C4H4O6) ≤0.2%
Zn ≤0.0005%
Support Material(s)
HR2-757 Citric acid pH 3.5 SDSCertificate Of Analysis
Related Item(S)
References
1. Crystallization and preliminary X-ray structure solution of Rhizomucor miehei aspartic proteinase. Jia, Z; Vandonselaar, M; Schneider, P; Quail, JW. Acta Crystallogr D 51, 243- 244, 1995.