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• W2073602983 abstract "A method of ion-interaction chromatography (IIR-RP-HPLC) for the simultaneous separation of 21 polar aromatic sulfonates is developed and optimised by a chemometric treatment. The analytes are: 1-naphthalene sulfonic acid (1-NS), 2-naphthalene sulfonic acid, 2-amino-1-naphthalene sulfonic acid (2-A-1-NS), 5-amino-2-naphthalene sulfonic acid (5-A-2-NS), 8-amino-2-naphthalene sulfonic acid (8-A-1-NS), 1-amino-5-naphthalene sulfonic acid (1-A-5-NS), 4-amino-1-naphthalene sulfonic acid (4-A-1-NS), 6-hydroxy-2-naphthalene sulfonic acid (6-H-2-NS), 4-hydroxy-1-naphthalene sulfonic acid (4-H-1-NS), 6-amino-4-hydroxy-2-naphthalene sulfonic acid (6-A-4-H-NS), 6-amino-1-hydroxy-3-naphthalene sulfonic acid (6-A-1-H-3-NS), 3-amino-2,7-naphthalene disulfonic acid (3-A-2,7-NdS), 7-amino-1,3-naphthalene disulfonic acid (7-A1,3-NdS), 2-amino-1,5-naphthalene disulfonic acid (2-A-1,5-NdS), 1-hydroxy-3,6-naphthalene disulfonic acid (1-H-3,6-NdS), 2-hydroxy-3,6-naphthalene disulfonic acid (2-H-3,6-NdS), 3-nitrobenzene sulfonic acid (3-NBS), 4-phenol sulfonic acid (4-PS), 4-hydroxy-3-nitrobenzene sulfonic acid (4-H-3-NBS), 1,2-benzene disulfonic acid (1,2-BdS), 2,6-anthraquinone disulfonic acid (2,6-AntdS). The factors optimised are: (i) the alkyl chain length of the ion-interaction reagent, (ii) the ion-interaction reagent concentration, (iii) the acetonitrile concentration and (iv) the pH of the mobile phase. An Fractional Factorial design, together with a star design are used to simultaneously study the effect of the variables and of their interactions. The retention times resulted to be not homogeneously distributed in the variable domain: in particular, for all the analytes considered, the use of nonylamine as the IIR caused unexpectedly large retention times. In these conditions, the linear regression algorithm failed in building good predictive models. The problem was solved by using the Box–Cox transformation, that considers other possible dependencies, besides the linear one, between the response (retention time tR) and the variables. In particular, a response 1/tR and 1tR permitted to better fit the data and to build reliable predictive models. In turn, the treatment of these models allowed us to locate the experimental conditions to separate, with good resolution, the 21 polar aromatic sulfonates in a total analysis time lower than 37 min." @default.
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• W2073602983 date "2000-11-01" @default.
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• W2073602983 title "Chemometrically assisted simultaneous separation of 21 aromatic sulfonates in ion-interaction RP-HPLC" @default.
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• W2073602983 doi "https://doi.org/10.1016/s0169-7439(00)00095-2" @default.
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