Fast determination of tobramycin by reversed-phase ion-pair high performance liquid chromatography with a refractive index detector

Liang ZHU, Jingkang WANG

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PDF(155 KB)
Front. Chem. Sci. Eng. ›› 2013, Vol. 7 ›› Issue (3) : 322-328. DOI: 10.1007/s11705-013-1348-z
RESEARCH ARTICLE

Fast determination of tobramycin by reversed-phase ion-pair high performance liquid chromatography with a refractive index detector

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Abstract

A simple and direct method without a derivation step for routine analysis of tobramycin has been developed. This method used reversed-phase ion-pair high performance liquid chromatography (HPLC) with a refractive index (RI) detector and a C18 column which is stable at pH above 1.00. The presence of 4.50 mg·mL-1 trifluoroacetic acid (TFA) in the mobile phase improved the protonation of tobramycin and the formation of ion-pairs, and thus reduced its hydrophility. This unique separation–detection combination showed good linearity with correlation coefficients 0.9996 in the concentration range of 0.25–2.50 mg·mL-1. The quantitation limit and detection limit were determined to be 0.23 mg·mL-1 and 0.071 mg·mL-1, respectively. Tobramycin was recovered in 98.00%, 98.84% and 99.64% for tobramycin solutions at concentrations of 2.25 mg·mL-1, 1.50 mg·mL-1 and 0.75 mg·mL-1, respectively. The relative standard deviations for six spiked samples ranged from 0.20% to 2.40%, indicating a good reproducibility of this method.

Keywords

tobramycin / aminoglycoside / refractive index detector / high-performance liquid chromatography / ion-pairing

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Liang ZHU, Jingkang WANG. Fast determination of tobramycin by reversed-phase ion-pair high performance liquid chromatography with a refractive index detector. Front Chem Sci Eng, 2013, 7(3): 322‒328 https://doi.org/10.1007/s11705-013-1348-z

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Acknowledgments

The authors are grateful to the professor Jianjun Huang of Tianjin university for providing the Milli-Q ultrapure water and Chongqing Daxin Pharmaceutical Co., Ltd. for supplying tobramycin solution used in this research.

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg
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