Synonyms: PEG 1,500
H(OCH₂CH₂)_nOH
M_r 1,400-1,600
CAS Number [25322-68-3]
EC Number 500-038-2
Merck 14,7568
RTECS TQ4030000
MDL Number MFCD00081839
PubChem Substance ID 24887690
Aldehyde None detected
Peroxide None detected

Measured Conductivity range: 38.7 – 48.5 µS/cm at 25°C
Measured Refractive Index range: 1.40094 – 1.40149 at 20°C

50% w/v Polyethylene glycol 1,500

1. Crystallization of the C-terminal domain of rabbit serum hemopexin. Baker, HM; Norris, GE; Morgan, WT; Smith, A; Baker, EN. J Mol Biol 229, 251- 252, 1993.

2. Crystallization and preliminary X-ray crystallographic study of ribosome-inactivating protein form barley seeds. Song, HK; Hwang, KY; Kim, KK; Suh, SW. Acta Crystallogr D 50, 910- 912, 1994.

Hampton Research, first in crystallization since 1991, developing and delivering crystallization and optimization screens, reagents, plates, and other tools for the crystallization of biological macromolecules, including proteins (antibody), peptides (insulin), and nucleic acids (DNA).

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Synonyms: 1,2,3-Propanetriol or Glycerin
HOCH₂CH(OH)CH₂OH
C₃H₈O₃
M_r 92.09
CAS Number [56-81-5]
EC Number 200-289-5
Beilstein Registry Number 635685
RTECS MA8050000
MDL Number MFCD00004722
PubChem Substance ID 24895252
Purity ≥ 99.0% (GC)
pKa 14.2

Measured pH range of 100% Glycerol: 5.0 – 7.7 at 25°C
Measured Conductivity Range: 0.0 – 0.2 µS/cm at 25°C
Measured Refractive Index Range: 1.47124 – 1.47450 at 20°C

Al  ≤0.0005%
Ca ≤0.0005%
Cd ≤0.0001%
Cl  ≤0.001%
Cu ≤0.0005%
Fe ≤0.0005%
K   ≤0.005%
Mg ≤0.0005%
NH₃ ≤0.05%
NH₄⁺ ≤0.05%
Na ≤0.005%
P  ≤0.0005%
Pb ≤0.001%
SO₄ ≤0.002%
Zn ≤0.0005%

100% Glycerol

1. Crystallization and Preliminary X-ray Analysis of the Auto-inhibited Twitchin Kinase. Hu, S-H; Lei, JY; Wilce, MCJ; Valenzuela, MRL; Benian, GM; Parker, MW; Kemp, BE. J Mol Biol 236, 1259- 1261, 1994.

Hampton Research, first in crystallization since 1991, developing and delivering crystallization and optimization screens, reagents, plates, and other tools for the crystallization of biological macromolecules, including proteins (antibody), peptides (insulin), and nucleic acids (DNA).

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Synonyms: PEG 2,000
H(OCH₂CH₂)_nOH
M_r 1,900-2,200
CAS Number [25322-68-3]
EC Number 500-038-2
RTECS TQ3500000
MDL Number MFCD00081839
PubChem Substance ID 24888269

Measured Conductivity Range: 30.2 – 30.8 µS/cm at 25°C
Measured Refractive Index Range: 1.40153 – 1.40158 at 20°C

Peroxides (as H₂O₂) ≤0.001%

Al  ≤0.0005%
As ≤0.00001%
Ba ≤0.0005%
Bi  ≤0.0005%
Ca ≤0.001%
Cd ≤0.0005%
Cl  ≤0.005%
Co ≤0.0005%
Cr ≤0.0005%
Cu ≤0.0005%
Fe ≤0.0005%
K  ≤0.02%
Li  ≤0.0005%
Mg ≤0.0005%
Mn ≤0.0005%
Mo ≤0.0005%
Na ≤0.02%
Ni ≤0.0005%
Pb ≤0.0005%
SO₄ ≤0.005%
Sr ≤0.0005%
Zn ≤0.0005%

50% w/v Polyethylene glycol 2,000

1. Unusual Base-Pairing Interactions in Monomer-Template Complexes. Zhang, W., Tam, C.P., Wang, J., Szostak, J.W. (2016) ACS Cent Sci 2: 916-926 PubMed: 28058281 DOI: 10.1021/acscentsci.6b00278

2. Structures of human O-GlcNAcase and its complexes reveal a new substrate recognition mode. Li, B., Li, H., Lu, L., Jiang, J. (2017) Nat Struct Mol Biol 24: 362-369 PubMed: 28319083 DOI: 10.1038/nsmb.3390

3. Mechanisms of RALF peptide perception by a heterotypic receptor complex. Xiao, Y., Stegmann, M., Han, Z., DeFalco, T.A., Parys, K., Xu, L., Belkhadir, Y., Zipfel, C., Chai, J. (2019) Nature 572: 270-274 PubMed: 31291642 DOI: 10.1038/s41586-019-1409-7

Hampton Research, first in crystallization since 1991, developing and delivering crystallization and optimization screens, reagents, plates, and other tools for the crystallization of biological macromolecules, including proteins (antibody), peptides (insulin), and nucleic acids (DNA).

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Synonyms: Hexamethylene glycol
HO(CH₂)₆OH
C₆H₁₄O₂
M_r 118.18
CAS Number [629-11-8]
EC Number 211-074-0
Beilstein Registry Number 1633461
Merck 14,4690
RTECS MO2100000
MDL Number MFCD00002985
PubChem Substance ID 24895435
Purity 97.0%
Melting point 38.0-42.0°C (literature)

Measured pH Range: 5.2 – 7.7 at 25°C
Measured Conductivity Range: 0.2 – 1.0 µS/cm at 25°C
Measured Refractive Index Range: 1.42340 – 1.42372 at 20°C

6.0 M 1,6-Hexanediol (71% w/v)

1. Structure of nucleosome core particles of chromatin. Finch, JT; Lutter, LC; Rhodes, D; Brown, RS; Rushton, B; Levitt, M; Klug, A. Nature 269, 29- 36, 1977.

2. Crystallization and preliminary X-ray analysis of bacteriophage T4 UvsY recombination mediator protein. H. Xu, H. T. H. Beernink, M. A. Rould and S. W. Morrical. Acta Cryst. (2006). F62, 1013-1015.

Hampton Research, first in crystallization since 1991, developing and delivering crystallization and optimization screens, reagents, plates, and other tools for the crystallization of biological macromolecules, including proteins (antibody), peptides (insulin), and nucleic acids (DNA).

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Synonyms: PEG 3,000
H(OCH₂CH₂)_nOH
M_r 2,700-3,300
CAS Number [25322-68-3]
EC Number 500-038-2
RTECS TQ3500000
MDL Number MFCD00081839
PubChem Substance ID 24887699

Measured Conductivity Range: 44.8 – 45.4 µS/cm at 25°C
Measured Refractive Index Range: 1.40163 – 1.40178 at 20°C

Peroxides (as H₂O₂) ≤0.001%

Al  ≤0.0005%
As ≤0.00001%
Ba ≤0.0005%
Bi  ≤0.0005%
Ca ≤0.001%
Cd ≤0.0005%
Cl  ≤0.005%
Co ≤0.0005%
Cr ≤0.0005%
Cu ≤0.0005%
Fe ≤0.0005%
K  ≤0.02%
Li  ≤0.0005%
Mg ≤0.0005%
Mn ≤0.0005%
Mo ≤0.0005%
Na ≤0.02%
Ni ≤0.0005%
Pb ≤0.0005%
SO₄ ≤0.005%
Sr ≤0.0005%
Zn ≤0.0005%

50% w/v Polyethylene glycol 3,000

1. Discovery of novel bacterial queuine salvage enzymes and pathways in human pathogens. Yuan, Y., Zallot, R., Grove, T.L., Payan, D.J., Martin-Verstraete, I., Sepic, S., Balamkundu, S., Neelakandan, R., Gadi, V.K., Liu, C.F., Swairjo, M.A., Dedon, P.C., Almo, S.C., Gerlt, J.A., de Crecy-Lagard, V. (2019) Proc Natl Acad Sci U S A 116: 19126-19135 PubMed: 31481610 DOI: 10.1073/pnas.1909604116

2. Crystal structure of the N-terminal domain of TagH reveals a potential drug targeting site. Yang, C.S., Huang, W.C., Ko, T.P., Wang, Y.C., Wang, A.H., Chen, Y. (2020) Biochem Biophys Res Commun 536: 1-6 PubMed: 33360015 DOI: 10.1016/j.bbrc.2020.12.028

3. Intracellular Neutralization of Ricin Toxin by Single-domain Antibodies Targeting the Active Site. Rudolph, M.J., Czajka, T.F., Davis, S.A., Thi Nguyen, C.M., Li, X.P., Tumer, N.E., Vance, D.J., Mantis, N.J. (2020) J Mol Biol 432: 1109-1125 PubMed: 31931008 DOI: 10.1016/j.jmb.2020.01.006

Hampton Research, first in crystallization since 1991, developing and delivering crystallization and optimization screens, reagents, plates, and other tools for the crystallization of biological macromolecules, including proteins (antibody), peptides (insulin), and nucleic acids (DNA).

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Polyethylene glycol 3,350
Synonyms: PEG 3,350
H(OCH₂CH₂)_nOH
Average M_r 3015-3685
CAS Number [25322-68-3]
EC Number 500-038-2
Merck 14,7568
MDL Number MFCD00081839
PubChem Substance ID 24898432
Polydispersity Index 1.05-1.10 (Polydispersity is a measure of the molecular weight distribution of a polymer. It is equal to Mw/Mn. That is to say, “weight-average molecular weight” divided by “number average molecular weight”.)

Aldehyde: None detected
Peroxide: None detected

HR2-527 Measured Conductivity Range: 44.0 – 55.1 µS/cm at 25°C
HR2-527 Measured Refractive Index Range: 1.40137 – 1.40213 at 20°C

Polyethylene glycol 3,350 Monodisperse

50% w/v Polyethylene glycol 3,350 Monodisperse

1. Crystal structure of a Soluble form of the human T Cell coreceptor CD8 at 2.6 A resolution. Leahy, DJ; Axel, R; Hendrickson, WA. Cell 68, 1145- 1162, 1992.

2. McPherson, A. 1976, Crystallization of proteins from polyethylene glcyol. J. Biol. Chem. 251: 6300.

Hampton Research, first in crystallization since 1991, developing and delivering crystallization and optimization screens, reagents, plates, and other tools for the crystallization of biological macromolecules, including proteins (antibody), peptides (insulin), and nucleic acids (DNA).

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Synonyms: MPD or Hexylene glycol
C₆H₁₄O₂
CH₃CH(OH)CH₂C(CH₃)₂OH
M_r 118.18
CAS Number [107-41-5]
EC Number 203-489-0
Beilstein Registry Number 1098298
Merck 14,4710
RTECS SA0810000
MDL Number MFCD00004547
PubChem Substance ID 329760818
Purity ≥ 99.0%
Density 0.925 g/mL at 25°C(lit.)
Boiling point 197.0° C (lit.)
Vapor pressure 0.02 mm Hg at 20°C (lit.)

Measured Conductivity Range: 0.0 – 0.3 µS/cm at 25°C
Measured Refractive Index Range: 1.42725 – 1.42825 at 20°C

100% (+/-)-2-Methyl-2,4-pentanediol

1. Crystallization and Preliminary X-ray Analysis of a Thermophillic Bacillus Xylanase. Pickersgill, RW; Debeire, P; Debeire-Gosselin, M; Jenkins, JA. J Mol Biol 230, 664- 666, 1993.

Hampton Research, first in crystallization since 1991, developing and delivering crystallization and optimization screens, reagents, plates, and other tools for the crystallization of biological macromolecules, including proteins (antibody), peptides (insulin), and nucleic acids (DNA).

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Synonyms: None
C₂H₇NO₂
CH₃COONH₄
M_r 77.08
CAS Number [631-61-8]
EC Number 211-162-9
Beilstein Registry 4186741
Merck 14,495
RTECS AF3675000
MDL Number MFCD00013066
Purity ≥ 99.0%
UN Number UN 3077 9/PG 3

HR2-565 Measured pH range: 6.8 – 7.2 at 25°C
HR2-565 Measured Conductivity Range: 62.0 – 72.9 mS/cm at 25°C
HR2-565 Measured Refractive Index Range: 1.34344 – 1.34417 at 20°C

HR2-799 Measured pH range: 7.6 – 7.9 at 25°C
HR2-799 Measured Conductivity Range: 68.9 – 105.1 mS/cm at 25°C
HR2-799 Measured Refractive Index Range: 1.39674 – 1.40910 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  ≤0.0002%
K   ≤0.005%
Li   ≤0.0005%
Mg ≤0.0005%
Mn ≤0.0005%
Mo ≤0.0005%
Na  ≤0.005%
Ni   ≤0.0005%
NO₃ ≤0.001%
Pb   ≤0.0005%
SO₄ ≤0.001%
Sr   ≤0.0005%
Zn   ≤0.0005%

1.0 M Ammonium acetate

8.0 M Ammonium acetate

Hampton Research, first in crystallization since 1991, developing and delivering crystallization and optimization screens, reagents, plates, and other tools for the crystallization of biological macromolecules, including proteins (antibody), peptides (insulin), and nucleic acids (DNA).

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Synonyms: PEG 4,000
H(OCH₂CH₂)_nOH
M_r 3,500-4,500
CAS Number [25322-68-3]
EC Number 500-038-2
Merck 14,7568
RTECS TQ3500000
MDL Number MFCD00081839
PubChem Substance ID 24890217
Melting point (Starting Material) 58.0-61.0°C
Aldehyde None detected
Peroxide None detected

HR2-529 Measured Conductivity Range: 34.0 – 46.9 µS/cm at 25°C
HR2-529 Measured Refractive Index Range: 1.40172 – 1.40279 at 20°C

Polyethylene glycol 4,000

50% w/v Polyethylene glycol 4,000

1. McPherson, A. 1976, Crystallization of proteins from polyethylene glcyol. J. Biol. Chem. 251: 6300.

2. Crystal structure of human annexin I at 2.5 A resolution. Weng, X; Luecke, H; Song, IS; Kang, DS; Kim, SH; Huber, R. Protein Sci 2, 448- 458, 1993.

3. Crystallization and preliminary X-ray analysis of CTP:phosphoethanolamine cytidylyltransferase (ECT) from Saccharomyces cerevisiae. J. Ohtsuka, K. Nagata, W. C. Lee, Y. Ono, R. Fukuda, A. Ohta and M. Tanokura. Acta Cryst. (2006). F62, 1003-1005.

Hampton Research, first in crystallization since 1991, developing and delivering crystallization and optimization screens, reagents, plates, and other tools for the crystallization of biological macromolecules, including proteins (antibody), peptides (insulin), and nucleic acids (DNA).

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Synonym: PEG 6,000
H(OCH₂CH₂)_nOH
M_r 5,000 – 7,000
CAS Number [25322-68-3]
EC Number 500-038-2
Merck 14,7568
RTECS TQ4105000
MDL Number MFCD00081839
PubChem Substance ID 24887715

HR2-533 Measured Conductivity range: 30.9 – 53.8 µS/cm at 25°C
HR2-533 Measured Refractive Index range: 1.40197 – 1.40251 at 20°C

DNases: none detected
RNases: none detected
Proteases: none detected
Phosphatases: none detected
Peroxides (as H₂O₂) < 0.001%

Al  ≤0.0005%
As ≤0.00001%
Ba ≤0.0005%
Bi  ≤0.0005%
Ca ≤0.001%
Cd ≤0.0005%
Cl  ≤0.005%
Co ≤0.0005%
Cr ≤0.0005%
Cu ≤0.0005%
Fe ≤0.0005%
K   ≤0.02%
Li  ≤0.0005%
Mg ≤0.0005%
Mn ≤0.0005%
Mo ≤0.0005%
Na ≤0.02%
Ni  ≤0.0005%
Pb ≤0.0005%
SO₄ ≤0.005%
Sr  ≤0.0005%
Zn ≤0.0005%

Polyethylene glycol 6,000

50% w/v Polyethylene glycol 6,000

1. McPherson, A. 1976, Crystallization of proteins from polyethylene glcyol. J. Biol. Chem. 251: 6300.

2. E144S active-site mutant of the bacillus cereus thermolysin-like neutral protease at 2.8 A resolution. Litster, SA; Wetmore, DR; Roche, RS; Codding, PW. Acta Crystallogr D 52, 543- 550, 1996.

3. Luft J.R. and DeTitta G.T. Chaperone salts, polyethylene glcyol and rates of equilibration in vapor-diffusion crystallization. Acta Crystallographica Section D 51: 780.

4. Gilliland, G.L. 1988. A biological macromolecule crystallization database: A basis for a crystallography strategy. J. Cryst. Growth. 90:51.

Hampton Research, first in crystallization since 1991, developing and delivering crystallization and optimization screens, reagents, plates, and other tools for the crystallization of biological macromolecules, including proteins (antibody), peptides (insulin), and nucleic acids (DNA).

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Synonyms: Salmiac
NH₄Cl
M_r 53.49
CAS Number [12125-02-9]
EC Number 235-186-4
Beilstein Registry Number 4371014
Merck 14,509
RTECS BP4550000
MDL Number MFCD00011420
PubChem Substance ID 24846273
UN Number UN 3077 9/PG 3
Purity ≥ 99.5%

Measured pH range of 5.0 M Ammonium chloride 4.1 – 4.4 at 25°C
Measured Conductivity Range: 539.2 – 588.0 mS/cm at 25°C
Measured Refractive Index Range: 1.38048 – 1.38078 at 20°C

Al  ≤0.0005%
As ≤0.00001%
Ba ≤0.0005%
Bi  ≤0.0005%
Ca ≤0.001%
Cd ≤0.0005%
Co ≤0.0005%
Cr ≤0.0005%
Cu ≤0.0002%
Fe ≤0.0002%
K   ≤0.005%
Li   ≤0.0005%
Mg ≤0.0005%
Mn ≤0.0005%
Mo ≤0.0005%
Na ≤0.005%
Ni  ≤0.0001%
NO₃ ≤0.0005%
Pb  ≤0.0001%
PO₄ ≤0.0002%
SO₄ ≤0.002%
Sr  ≤0.0005%
Zn  ≤0.0002%

5.0 M Ammonium chloride

1. Structural studies on transfer RNA: preliminary crystallographic analysis. Labanauskas, M; Conners, PG; Young, JD; Bock, RM; Anderegg, JW; Beeman, WW. Science 166, 1530- 1532, 1969.

2. Crystal structure of the kringle 2 domain of tissue plasminogen activator at 2.4-A resolution. de Vos, AM; Ultsch, MH; Kelley, RF; Padmanabhan, K; Tulinsky, A; Westbrook, ML; Kossiakoff, AA. Biochemistry 31, 270- 279, 1992.

Hampton Research, first in crystallization since 1991, developing and delivering crystallization and optimization screens, reagents, plates, and other tools for the crystallization of biological macromolecules, including proteins (antibody), peptides (insulin), and nucleic acids (DNA).

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Synonyms: PEG 8,000
H(OCH₂CH₂)_nOH
M_r 7,000 – 9,000
CAS Number [25322-68-3]
EC Number 500-038-2
Merck 14,7568
RTECS TQ4105000
MDL Number MFCD00081839
PubChem Substance ID 24887728

HR2-535 Measured Conductivity Range: 27.3 – 39.3 µS/cm at 25°C
HR2-535 Measured Refractive Index Range: 1.40195 – 1.40261 at 20°C

DNases: none detected
RNases: none detected
Proteases: none detected
Phosphatases: none detected
Aldehyde none detected
Peroxides (as H₂O₂) ≤0.001%

Al  ≤0.0005%
As ≤0.00001%
Ba ≤0.0005%
Bi  ≤0.0005%
Ca ≤0.001%
Cd ≤0.0005%
Cl  ≤0.005%
Co ≤0.0005%
Cr ≤0.0005%
Cu ≤0.0005%
Fe ≤0.0005%
K  ≤0.02%
Li  ≤0.0005%
Mg ≤0.0005%
Mn ≤0.0005%
Mo ≤0.0005%
Na ≤0.02%
Ni ≤0.0005%
Pb ≤0.0005%
SO₄ ≤0.005%
Sr ≤0.0005%
Zn ≤0.0005%

Polyethylene glycol 8,000

50% w/v Polyethylene glycol 8,000

1. Crystallization and preliminary X-ray diffraction studies on ADP-ribosylation factor 1. Greasley, S; Jhoti, H; Fensome, AC; Cockcroft, S; Thomas, GM; Bax, B. J Mol Biol 244, 651- 653, 1994.

2. McPherson, A. 1976, Crystallization of proteins from polyethylene glcyol. J. Biol. Chem. 251: 6300.

Hampton Research, first in crystallization since 1991, developing and delivering crystallization and optimization screens, reagents, plates, and other tools for the crystallization of biological macromolecules, including proteins (antibody), peptides (insulin), and nucleic acids (DNA).

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Synonyms: Citric acid ammonium salt or Diammonium hydrogen citrate or Di-Ammnonium citrate or Ammonium hydrogencitrate
C₆H₁₄N₂O₇
(NH₄)₂C₆H₆O₇
HOC(CO₂H)(CH₂CO₂NH₄)₂
M_r 226.19
CAS Number 3012-65-5
EC Number 221-146-3
Merck 14,512
Beilstein Registry Number 4925760
RTECS GE7545000
MDL Number MFCD00013068
PubChem Substance ID 24846459
Purity ≥ 99.0%

Measured pH range: 4.7 – 4.8 at 25°C
Measured Conductivity Range: 76.8 – 83.1 mS/cm at 25°C
Measured Refractive Index Range: 1.41993 – 1.42027 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%
Pb  ≤0.0005%
PO₄ ≤0.0005%
SO₄ ≤0.005%
Sr  ≤0.0005%
Zn  ≤0.0005%

2.5 M Ammonium citrate dibasic

1. Structure of serum response factor core bound to DNA. Pellegrini, L; Tan, S; Richmond, TJ. Nature 376, 490- 498, 1995.

2. Crystal structure of the ligand-binding domain of the human nuclear receptor RXR-alpha. Bourguet, W; Ruff, M; Chambon, P; Gronemeyer, H; Moras, D. Nature 375, 377- 382, 1995.

Hampton Research, first in crystallization since 1991, developing and delivering crystallization and optimization screens, reagents, plates, and other tools for the crystallization of biological macromolecules, including proteins (antibody), peptides (insulin), and nucleic acids (DNA).

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Synonyms: PEG 10,000
H(OCH₂CH₂)_nOH
M_r 8,500 – 11,500
CAS Number [25322-68-3]
EC Number 500-038-2
Merck 14,7568
RTECS TQ4110000
MDL Number MFCD00081839
PubChem Substance ID 24887732

Aldehyde None detected
Peroxide None detected

Measured Conductivity Range: 38.2 – 48.3 µS/cm at 25°C
Measured Refractive Index Range: 1.40165 – 1.40271 at 20°C

50% w/v Polyethylene glycol 10,000

1. Crystal structure of a catalytic antibody Fab with esterase-like activity. Golinelli-Pimpaneau, B; Gigant, B; Bizebard, T; Navaza, J; Saludjian, P; Zemel, R; Tawfik, DS; Eshhar, Z; Green, BS; Knossow, M. Structure 2, 175- 183, 1994.

Hampton Research, first in crystallization since 1991, developing and delivering crystallization and optimization screens, reagents, plates, and other tools for the crystallization of biological macromolecules, including proteins (antibody), peptides (insulin), and nucleic acids (DNA).

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Synonyms: Citric acid triammonium salt or Triammonium citrate
HOC(COONH₄)(CH₂COONH₄)₂
C₆H₁₇N₃O₇
M_r 243.22
CAS Number [3458-72-8]
EC Number 222-394-5
Beilstein Registry Number 3779194
MDL Number MFCD00036406
PubChem Substance ID 24890533
Purity ≥ 97.0%

Appearance (Solution): Clear with a very light yellow to brown tint color

HR2-759 titrated to pH 7.0 using HCl (used in SaltRx, Index, PEG/Ion, PegRx, and PEG/Ion 400)
Measured Conductivity Range: 95.4 – 97.9 mS/cm at 25°C
Measured Refractive Index Range: 1.43139 – 1.43241 at 20°C

HR2-865 is not titrated to a specific pH (used in GRAS Screen 1, 2, 3, 4, 7, and PEG/Ion 400)
Measured pH Range:  7.7 at 25°C
Measured Conductivity Range:  95.9 – 96.2 mS/cm at 25°C
Measured Refractive Index Range:   1.43204 – 1.43211 at 20°C

2.5 M Ammonium citrate tribasic pH 7.0

2.5 M Ammonium citrate tribasic

Hampton Research, first in crystallization since 1991, developing and delivering crystallization and optimization screens, reagents, plates, and other tools for the crystallization of biological macromolecules, including proteins (antibody), peptides (insulin), and nucleic acids (DNA).

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