利用毛细管等速电泳和区带电泳测定单一异构体和随机高硫酸盐环糊精的有效电荷数和离子迁移率

IF 3 3区 生物学 Q2 BIOCHEMICAL RESEARCH METHODS
Veronika Šolínová, Dušan Koval, Václav Kašička
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引用次数: 0

摘要

硫酸化环糊精(CD)是一种多重负电荷分子,在毛细管电泳(CE)中被广泛用作手性选择剂。在某些应用中,由于与反离子的强结合,观察到其分子的有效电荷数低于所附硫酸基团的电荷数。然而,理论电荷的减少程度并未量化。因此,本研究采用毛细管等渗电泳(CITP)和毛细管区带电泳(CZE)测定了两种硫酸化 CD 的有效电荷数和实际离子迁移率:单一异构体硫酸化 α-、β- 和 γ-CDs (SI-CDs)和随机高度硫酸化 α-、β- 和 γ-CDs (HS-CDs)。SI-CDs 和 HS-CDs 的有效电荷数是根据其 ITP 区的长度、CZE 测定的离子迁移率和用于 CITP 分析的溶液摩尔浓度,以及参考化合物(SI-CDs 用甲酸,HS-CDs 用二氯乙酸)的相同参数确定的。测定的 SI-CD 的有效电荷数等于或略低于其分子中的硫酸基团数,但随机 HS-CD 的有效电荷数则比其分子中硫酸基团的平均数量显著减少(22.2%-27.8%)。由于 SI-CD 中硫酸基团的数量低于 HS-CD,因此 SI-CD 实际离子迁移率的绝对值(35.5-37.5)×10-9 m2 V-1 s-1 低于 HS-CD 的绝对值(43.5-44.1)×10-9 m2 V-1 s-1。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Determination of the Effective Charge Numbers and Ionic Mobilities of Single Isomer and Randomly Highly Sulfated Cyclodextrins by Capillary Isotachophoresis and Zone Electrophoresis.

Sulfated cyclodextrins (CDs) are multiply negatively charged molecules widely used as chiral selectors in capillary electrophoresis (CE). In some of their applications, the effective charge numbers of their molecules were observed to be lower than the numbers of the attached sulfated groups due to strong binding of counterions. However, degree of reduction of the theoretical charge was not quantified. For that reason, in this study, capillary isotachophoresis (CITP) and capillary zone electrophoresis (CZE) were applied for the determination of the effective charge numbers and actual ionic mobilities of two kinds of sulfated CDs: single isomer sulfated α-, β-, and γ-CDs (SI-CDs) and randomly highly sulfated α-, β-, and γ-CDs (HS-CDs). The effective charge numbers of the SI-CDs and HS-CDs were determined from the length of their ITP zones, the ionic mobilities determined by CZE, and molar concentrations of their solutions applied for CITP analysis, and from the same parameters of reference compounds, formic acid for SI-CDs and dichloroacetic acid for HS-CDs. The determined effective charge numbers of the SI-CDs were equal to or only slightly lower than the numbers of sulfate groups in their molecules but the effective charge numbers of randomly HS-CDs were significantly (22.2%-27.8%) reduced as compared to the average numbers of sulfate groups in their molecules. In accordance with a lower number of sulfate groups in SI-CDs than in HS-CDs, the absolute values of the actual ionic mobilities of SI-CDs (35.5-37.5) × 10-9 m2 V-1 s-1 were lower than those of HS-CDs (43.5-44.1) × 10-9 m2 V-1 s-1.

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来源期刊
ELECTROPHORESIS
ELECTROPHORESIS 生物-分析化学
CiteScore
6.30
自引率
13.80%
发文量
244
审稿时长
1.9 months
期刊介绍: ELECTROPHORESIS is an international journal that publishes original manuscripts on all aspects of electrophoresis, and liquid phase separations (e.g., HPLC, micro- and nano-LC, UHPLC, micro- and nano-fluidics, liquid-phase micro-extractions, etc.). Topics include new or improved analytical and preparative methods, sample preparation, development of theory, and innovative applications of electrophoretic and liquid phase separations methods in the study of nucleic acids, proteins, carbohydrates natural products, pharmaceuticals, food analysis, environmental species and other compounds of importance to the life sciences. Papers in the areas of microfluidics and proteomics, which are not limited to electrophoresis-based methods, will also be accepted for publication. Contributions focused on hyphenated and omics techniques are also of interest. Proteomics is within the scope, if related to its fundamentals and new technical approaches. Proteomics applications are only considered in particular cases. Papers describing the application of standard electrophoretic methods will not be considered. Papers on nanoanalysis intended for publication in ELECTROPHORESIS should focus on one or more of the following topics: • Nanoscale electrokinetics and phenomena related to electric double layer and/or confinement in nano-sized geometry • Single cell and subcellular analysis • Nanosensors and ultrasensitive detection aspects (e.g., involving quantum dots, "nanoelectrodes" or nanospray MS) • Nanoscale/nanopore DNA sequencing (next generation sequencing) • Micro- and nanoscale sample preparation • Nanoparticles and cells analyses by dielectrophoresis • Separation-based analysis using nanoparticles, nanotubes and nanowires.
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