Advantages of HPLC with Ultra Stable Phases

描述(申请人提供)：本提案汇集了一支由分离科学家、分析化学家和2名计算机科学家组成的团队，以进一步开发高速二维液相色谱3(2DLC)。我们的主要目标是将2DLC从一种适用于具有数千个组件的复杂4个样品的利基技术转变为一种更实用、更容易获得的方法。我们将制造和表征一些创新的稳定固定相，包括我们认为将非常适合于质谱分析的弱酸性阳离子6交换剂，以及用于8 2DLC的新型7两性离子和非常高亲水性的相。在表征之后，我们将专注于这些材料在生物医学研究和药物以及环境和工作场所毒物分析中的高速、强大的应用9。当我们要用高温LC来实现高速2DLC时，稳定的相对于用作超高速二维柱至关重要。我们现在在30分钟的总时间内产生远远超过1000的有效峰值容量(而不是12个假设的峰值容量)，从而达到每秒两个峰值的13个速率。在以前的工作中，2DLC被应用于胰酶消化(IEX X RPLC)，原生和突变玉米提取物的14个低分子成分，以及尿液、葡萄酒和15个咖啡样品，所有这些都使用RPLC x RPLC。更重要的是，研究了2DLC的局限性，并与完全优化的1DLC进行了系统的比较。我们表明，2DLC 17比完全优化的1DLC在大约10分钟的时间内产生更高的分辨率。我们的工作表明，进一步提高第二维度的速度将是重要的。19因此，通过进一步改进仪器和色谱柱的设计，我们建议在不影响峰值容量的情况下提高第二维度的速度。此外，我们还将开发一种新的分离模式--“动态梯度洗脱”--以最大限度地利用2D分离空间，从而提高峰容量。我们将探索特殊的RPLC溶剂和23种新的固定相的潜力，以优化第一个分离维度。我们提出了探索24种化学选择性预分馏方法，以创建一种“伪”的三维25分离。最初的努力将集中在碳水化合物分离的化学选择性方法26及其在糖组分中的应用。还将进行一系列理论研究，以了解优化2DLC分离所涉及的27项妥协。最后，2DLC中的保留时间28对齐比2DGC中的困难和严重得多。我们将通过几种新的化学计量学方法来解决这个问题，这样2DLC就可以进行长期的代谢组学研究，这显然优于生物材料的2DGC。与公共健康相关：绝大多数生物、医学、农业和环境实验和测量涉及对极其复杂的混合物的分析，这些混合物包含数百种不同的化学物质，其相对含量范围为一百万倍或更大。只有当感兴趣的化学物质能够从所有干扰物质中分离出来时，才有可能对这些混合物进行分析。这项工作的目的是提高液相色谱的分离能力，特别是速度，以便对复杂的生物混合物进行详细的、高分辨率的研究，从而有可能找到疾病的生物标志物，并促进我们对食品和药物代谢的了解。

DESCRIPTION (provided by applicant): The present proposal assembles a team of separation scientists, analytical chemists and 2 computer scientists to further develop high speed two-dimensional liquid chromatography 3 (2DLC). Our principal goal is to transform 2DLC from a niche technique for use on complex 4 samples with 1000s of components into a more practical, accessible method. We will make and 5 characterize a number of innovative stable stationary phases, including a weak acid cation 6 exchanger that we believe will be ideally suited for mass spec analysis as well as novel, 7 zwitterionic and very highly hydrophilic phases designed for use as RPLC and HILIC phases for 8 2DLC. After characterization, we will focus on high-speed, robust application of these materials 9 in biomedical studies and the analysis of pharmaceuticals and environmental and workplace 10 toxicants. Stable phases are critical for use as the ultra-fast second dimension column when we 11 use high temperature LC to implement high speed 2DLC. We now generate effective (not 12 hypothetical) peak capacities of well over 1,000 in a total time of 30 minutes, thereby reaching 13 rates of two peaks/second. In prior work, 2DLC was applied to a tryptic digest (IEX x RPLC), the 14 low molecular weight components of native and mutant maize extracts, as well as urine, wine and 15 coffee samples, all using RPLC x RPLC. More important, the limitations of 2DLC were studied 16 and a systematic comparison to fully optimized 1DLC was initiated. We showed that 2DLC 17 produces more resolution than fully optimized 1DLC in times of only about 10 minutes. Our 18 work shows that it will be important to increase the speed of the second dimension even further. 19 Thus, by additional improvements in instrument and column design, we propose to increase the 20 speed of the second dimension without compromising peak capacity. Moreover, we will develop 21 a novel mode of separation-"dynamic gradient elution"-to maximize use of the 2D separation 22 space and thus peak capacity. We will explore the potential of unusual RPLC solvents and a 23 novel stationary phase for optimizing the first separation dimension. We propose the exploration 24 of chemically selective pre-fractionation methods to create a "pseudo" three-dimensional 25 separation. Initial efforts will focus on chemically selective methods of carbohydrate separation 26 and their application to glycomics. A series of theoretical studies aimed at understanding the 27 compromises involved in optimizing 2DLC separations will also be done. Finally, retention time 28 alignment in 2DLC is much more difficult and more serious than in 2DGC. We will approach this 29 problem by several new chemometric routes so that long-term metabolomic studies can be carried 30 out by 2DLC, which is clearly superior to 2DGC for biological materials. PUBLIC HEALTH RELEVANCE: The vast majority of all biological, medical, agricultural and environmental experiments and measurements involve the analysis of extremely complex mixtures containing hundreds, if not thousands, of different chemical entities spanning a million fold or greater range in relative amounts. The analysis of these mixtures only becomes possible when the chemicals of interest can be separated from all interfering substances. The object of this work is to improve the separating power, and especially the speed, of liquid chromatography to allow the detailed, high resolution study of complex biological mixtures and thus make it possible to find the biomarkers of disease as well as promote our understanding of the metabolism of foods and pharmaceuticals.