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. Author manuscript; available in PMC: 2014 Jul 1.
Published in final edited form as: J Sep Sci. 2013 May 27;36(13):2210–2215. doi: 10.1002/jssc.201300260

Figure 1.

Figure 1

Separation of test samples by pH-zone-refining CCC Experimental conditions: Apparatus: the type-J coil planet centrifuge equipped with multilayer coil sparation column of 220 ml capacity; solvent system MtBE/acetonitrile/water (4:1:5), retainer/eluter: a (1% TFA/1% NH4OH), b (10 mM TFA/10 mM NH4OH) and c (8 mM TFA/10 m M NH4OH); flow rate: 2 ml/min; mobile phase: lower phase; elution mode: head to tail; revolution speed: 800 rpm; detection wavelength: 245 nm.