DNA Pac PA-100 Analytical Guard Column 9 x 50 mm. DNA Pac PA-100 Analytical Guard Column, Particle Size: 13um, Mobile Phase: 410-510mM NaCl in 25mM Tris-Cl, pH 8.0, Flow Rate: 1.5mL/min, Detection: UV, 260nm, Sample: pd(A)40-60, High-resolution oligonucleotide separations, Size: 9 x 50 mm