Simulation of the effects of negative thermal gradients on separation performance of gas chromatography.

Simulation of the effects of negative thermal gradients on separation performance of gas chromatography.
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负热梯度对气相色谱分离性能影响的模拟

DOI:
10.1016/j.chroma.2021.461943
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发表时间:
2021
期刊:
Journal of chromatography. A
影响因子:
--
通讯作者:
Boeker
Boeker
中科院分区:
--
文献类型:
--
作者:
Leppert;Blumberg;Leonid M;Matthias;Boeker

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通过模拟研究了溶质速度梯度对近距离溶质色谱分离的影响。由Blumberg提出的理想基本分离(IBS)的概念被用来确定分离的理论极限,而不需要任何自然或人工的色谱介质特征梯度。IBS是最好的可实现的分离,因此可用作其他分离可与之比较的基线。添加负速度梯度并不能改善紧密分布的溶质的分离。速度梯度是通过在GC分离中加入温度梯度来实现的。在第二部分中,我们使用与IBS的受控偏差来说明,速度梯度在现实的、非IBS中是有益的。添加负速度梯度可以改善宽进样溶质区的分离,或抵消气体沿GC柱减压引起的流动相速度正梯度。然而,改进后的分离不能超过相应的理想基本分离。通过增加负速度梯度,宽注入溶质的分辨率可以提高高达相应IBS分辨率的45%。由于气体减压而产生的正速度梯度使分离度降低高达6%。通过线性温度梯度实现的附加负速度梯度可以补偿高达2%的分辨率损失。
The effect of a gradient of solute velocity on the chromatographic separation of closely spaced solutes is investigated by usage of a simulation. The concept of theideal basic separation(IBS), introduced by Blumberg, is used to determine the theoretical limit of a separation without any natural or artificial gradients of features of the chromatographic medium. The IBS is the best achievable separation and can therefore be used as a baseline to which other separations can be compared to. An addition of a negative velocity gradient cannot improve the separation of closely spaced solutes. The velocity gradient is realized by adding a temperature gradient to a GC separation. The simulation confirms this theoretical limit for a range of differently strong retained solutes.In a second part controlled deviations from IBS are used to show, that a velocity gradient can be beneficial in realistic, non-IBS. The addition of a negative velocity gradient can improve e.g. the separation of broad injected solute zones or counteract a positive gradient of the mobile phase velocity caused by gas decompression along the GC column. However, the improved separation cannot exceed that of a corresponding ideal basic separation. The resolution of broadly injected solutes can be increased by up to 45% of the corresponding IBS resolution by adding a negative velocity gradient. A positive velocity gradient due to gas decompression reduces the separation by up to 6%. The added negative velocity gradient, realized by a linear temperature gradient, can compensate this resolution loss by up to 2%.
使用沿毛细管柱的温度梯度进行气相色谱中的柱上温度编程
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DOI: 10.1016/j.chroma.2014.10.090
发表时间: 2014
期刊: Journal of chromatography. A
影响因子: --
作者:
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