title: Simultaneous determination of active ingredients in an ophthalmic solution by isocratic tandem-mode HPLC connected reverse phase column and strong cation exchange column.
abstract: A tandem-mode high performance liquid chromatography (HPLC) system is described here, which employs reversed phase liquid chromatography (RPLC) followed by strong cation exchange liquid chromatography (SCX), was used to determine the mixture of six ingredients in an ophthalmic solution. As a result of investigations, isocratic HPLC methods that using two columns in tandem-mode; Atlantis dC18 (75 mm x 4.6 mm i.d., 3 microm, ODS) and CAPCELL PAK SCX UG80 (75 mm x 4.6 mm i.d., SCX), which have different separation modes, and control of mixture of methanol/ammonium dihydrogenphosphate buffer as used for the eluent, allowed for six target ingredients to be determined simultaneously. And all ingredients separated perfectly and were determined efficiently and rapidly. Validation of the method was accomplished with respect to linearity (r>0.999), recovery (99.4-100.4%), precision (R.S.D. 0.1-0.9%) and specificity. These results suggest that the fusion of different separation modes can be used for the simultaneous determination of ingredients in ophthalmic solutions, and this can be accomplished rapidly and with high precision.
authors.affiliation: Analytical Laboratory, Taisho Pharmaceutical Co., Ltd., 403 Yoshino-cho 1-chome, Kita-ku, Saitama-shi, Saitama 331-9530, Japan. t.marunouchi@po.rd.taisho.co.jp
authors.forename: Takahiro
authors.initials: T
authors.lastname: Marunouchi
authors.forename: Masaki
authors.initials: M
authors.lastname: Ono
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Nakajima
authors.forename: Yuji
authors.initials: Y
authors.lastname: Ito
authors.forename: Takao
authors.initials: T
authors.lastname: Aketo
mesh_terms: D015119:Aminocaproic Acid / Q000032:analysis; D002744:Chlorpheniramine / Q000032:analysis; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D000432:Methanol; D009388:Neostigmine / Q000032:analysis; D009883:Ophthalmic Solutions / Q000737:chemistry*; D010710:Phosphates; D015203:Reproducibility of Results; D013997:Time Factors
chemical_list: D009883:Ophthalmic Solutions; D010710:Phosphates; C024788:ammonium phosphate; D009388:Neostigmine; D002744:Chlorpheniramine; D015119:Aminocaproic Acid; D000432:Methanol