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The columnused was Zorbax C-8 (4.6¡Á250 mm and 5 ¦Ì) and mobile phase
was a mixture of acetonitrile/buffer [80:20 (v/v)]. The buffer used was a mixture of a 50-mM potassium dihydrogen phosphate,0.1% w/v triethylamine, 0.25% w/v octane-1-sulphonic acid, and 0.25% w/v heptane-1-sulphonic acid with pH 2.5¡À0.1. The operating parameters were set at flow rate of 2 ml/min,loop size of 100 ¦ÌL, column oven temperature at 60¡ãC,and detection wavelength at 210 nm. The data were
obtained and processed using ChromPass™ Software(Jasco,Tokyo, Japan)
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