کارتریج CLEAN-UP Quaternary Amine w Acetate

ویژگی های محصول:
  • QAX:Chemical Phase
  • 8.4%:Organic Loading
  • 60Å:Average Pore Size
  • 0.230 meq/g:Anion Exchange
  • 500 m2/g:Surface Area
  • 0.77 cm3/g:Pore Volume
دسته‌بندی:

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MECHANISM OF ION EXCHANGE BONDING

Compounds are retained on the sorbent through ionic bonds.  Therefore, it is essential that the sorbent and the analyte to be extracted are charged.  Generally, the number of molecules with charged cationic groups increases at pH values below the molecules pKa value.  The number of molecules with charged anionic groups decreases at pH values below the molecule’s pKa value.  To ensure 99% or more ionization, the pH should be at least two pH units below the pKa of the cation and two pH units above the pKa of the anion.  Elution occurs by using a solvent to raise the pH above the pKa of the cationic group or to lower the pH below the pKa of the anion to disrupt retention.  At this point, the sorbent or compound is neutralized.

These sorbents are composed of a silica backbone bonded with carbon chains terminated by a negatively or positively charged functional group.  Ion exchange interactions occur between a sorbent that carries a charge and a compound of opposite charge.

This electrostatic interaction is reversible by neutralizing the sorbent and/or analyte.  Ion exchange bonds can also be disrupted by the introduction of a counter ion to compete with the analyte for binding sites on the sorbent.

ANION EXCHANGE SORBENTS & STRUCTURES

Sorbent                                                                         Structure                                                                               pKa

Aminopropyl (primary amine)                                   -Si-(CH2)3NH3+                                                                             9.8

N-2-Aminoethyl (primary & secondary amine)            -Si-(CH2)3NH2+(CH2)2NH3+                                                          10.1, 10.9

Diethylamino (tertiary amine)                                  -Si-(CH2)3NH+(CH2CH3)2                                                              10.6

Quaternary Amine Chloride                                    -Si-(CH2)3N+(CH3)3 Cl–                                                         Always charged

Quaternary Amine Hydroxide                                 -Si-(CH2)3N+(CH3)3 OH–                                                       Always charged

Quaternary Amine Acetate                                     -Si-(CH2)3N+(CH3)3 CH3COO–                                             Always charged

Quaternary Amine Formate                                    -Si-(CH2)3N+(CH3)3 HCOO–                                                  Always charged

Polyimine                                                            -Si-(CH2)3NH(CH2COOH)(CH2)N(CH2COOH)2

 

UnitsDescriptionPart Number
50Clean-Up Quaternary Amine with Acetate Counter Ion 200mg 10mLCAQAX12Z
30Clean-Up Quaternary Amine with Acetate Counter Ion 1000mg 6mLCAQAX1M6
100Clean-Up Quaternary Amine with Acetate Counter Ion 100mg 1mLCAQAX111
50Clean-Up Quaternary Amine with Acetate Counter Ion 200mg 3mLCAQAX123
20Clean-Up Quaternary Amine with Acetate Counter Ion 5000mg 25mLCAQAX15M25
50Clean-Up Quaternary Amine with Acetate Counter Ion 500mg 10mLCAQAX15Z
50Clean-Up Quaternary Amine with Acetate Counter Ion 500mg 3mLCAQAX153
100Clean-Up Quaternary Amine with Acetate Counter Ion 50mg 1mLCAQAX1L1

 

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کارتریج CLEAN-UP Quaternary Amine w Acetate

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