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論文
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早川, 和一 ; 山本, 敦 ; 宮崎, 元一
概要:
Ion chromatography (IC), which was introduced in 1975, has become widely used for the sensitive and simultaneous determination of ions. In the early stage, the IC system consisted of two ion-exchange columns (separator and suppressor,
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respectively) and a conductivity detector. Although this combination is still the most popular, new forms of separation and suppression have been developed. On the other hand, an indirect photometric detection using a UV detector has become popular in IC and other detectors commonly used in HPLC also have been used. Each of them has specific advantages for different types of analyses. Thus, IC is now defined as a form of liquid chromatography of ions. This article reviews new developments of the different forms of IC and their applications, especially to environmental samples, foods, biological materials and drugs, from reports published since 1990.
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論文
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早川, 和一 ; 宮崎, 元一
概要:
Ion chromatography (IC) with conductivity detection, which was introduced in 1975, has become widely used for the simultaneous determination of inorganic and organic ions. On the other hand, photometric ion chromatography (PIC) based on
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the difference of absorbances of sample and eluent (mobile phase) species has attracted much attention in the recent field of IC, since this technique has potential advantages over IC methods with conductivity detection. This technique which allows IC on a conventional single column HPLC system with an absorbance detector gives compatible sensitivity to conductivity detection. This paper deals mainly with indirect PIC methods performed by both ion exchange and reversedphase modes, where non-UV-absorbing ions are detected as positive and negative peaks by using UV-absorbing ions in the eluent (mobile phase). The features of PIC have been reasonably well known, but it is necessary to understand principles and conditions of PIC for the effective use of this technique. This paper reviews a number of significant reports which deal with the optimisations of separating column, eluent (mobile phase), detection wavelength, sensitivity and restrictions of PIC with its applications. It is also the purpose of this paper to discuss alternative methods and innovations of PIC.
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論文
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早川, 和一 ; 山本, 敦
概要:
金沢大学医薬保健研究域薬学系<br />これまで, 液体クロマトグラフィーにおける吸光度検出器は専ら光吸収を有する化合物を検出する装置であり, その原理と検出器は既に完成されたものとの印象が強かった.本総説は, 上述の概念を大きく変革しつつ
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ある吸光度検出法の新展開として, 光吸収のない対象物質を検出できる間接吸光度検出法と, 更にその考え方を光学活性物質の検出に向けた偏光吸光度検出法に焦点を合わせ, 著者らの研究成果も含めて紹介する. New photometric detection methods developed for use in liquid chromatography have been reviewed. Differential photometric detection using UV-visible absorbing modifiers enabled us to examine the retention and detection mechanism of not only analytes but also mobile phases. Indirect photometric detection ion chromatography based on this theory separately and sensitively determines ionic compounds using a conventional high-performance liquid chromatographic system with a UV-visible absorbance detector. This method is useful for many kinds of samples such as environmental water, foods and biological materials. Polarized photometric detection mathods with two polarizers on either side of a UV-visible absorbance detector flow cell have been developed. The monitor determines optically active compounds as the change in absorbance. This method was effectively applied for determining sugars and organic acids
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