HPLC Columns

TSKgel OApak-A

The TSKgel OApak-A column is packed with porous hydrophilic polymer beads which have been chemically modified with a weak cation exchange group. This column is optimized for the separation and analysis of organic acids by an ion exclusion mechanism. Applications include organic acids in fruit juices, wine, beer, coffee, and salt solutions.

This column is to be used in conjunction with the TSKgel OApak-P guard column which has a strong cation exchanger for the removal of dissociated strong acids under the isocratic mobile phase conditions of 0.75 mmol/L H2SO4.


P/NDescriptionParticle Size Housing MaterialID (mm)Length (cm)Price ($) 
16653TSKgel OApak-A5Stainless Steel7.8301,821

Product Attributes

Matrix: hydrophilic polymer
Particle size (mean): 5 µm
Pore size (mean): ND
Functional group: proprietary
Counter ion: H+
pH stability: 2.0 - 12.0
Small ion capacity: >1.5 eq/L






Separation of Organic Acids



Columns: A: TSKgel OApak-A, 5 µm,
7.8 mm ID × 30 cm
B: TSKgel OApak-P guard,
6 mm ID × 4 cm
Mobile phase: 0.75 mmol/L sulfuric acid
Flow rate: 0.8 mL/min
Detection: conductivity
Temperature: 60 °C
Injection vol.: 20 µL
Samples: 1. pyruvic acid (50 ppm)
2. tartaric acid (500 ppm)
3. citric acid (500 ppm)
4. malic acid (500 ppm)
5. pyroglutamic acid (500 ppm)
6. lactic acid (1,000 ppm)
7. acetic acid (2,000 ppm)
8. succinic acid (1,000 ppm)


For additional applications, please see our applications database.


Code #DescriptionLiterature Type
DS1104 TSKgel OApak ColumnsOperating Conditions and Specifications
IM01 TSKgel Column Instruction ManualInstruction Manual
LCAT02B TSKgel U/HPLC Columns 2019 Product Guide -- CIEC ColumnsProduct Catalog
P/NDescriptionParticle Size Housing MaterialID (mm)Length (cm)Price ($) 
16654TSKgel OApak-A Guard Column for 7.8 mm ID column10Stainless Steel64598