Tag Archives: HPLC

SERMACS 2012 – Southeastern Regional Meeting of the American Chemical Society

How to do more with less is a consistent theme in today’s chemical development laboratories. Researchers are challenged with how quickly and cost-effectively they can deliver high quality chemical products and the processes used to make them. This in turn has driven a trend in industry to develop and adopt new methods of working, and new techniques to analyze chemical reactions. Continue reading

Workflow for Linearity Testing using Automated Sample Preparation and UHPLC

When validating a method according to the International Conference on Harmonisation of Technical Requirements for Registration of Pharmaceuticals for Human Use (ICH) guidelines, it is necessary to perform a linearity experiment. This requires the preparation of multiple calibration levels, analysis of the samples by liquid chromatography, and calculation/reporting of the results. Each of these steps can be very time consuming, and in many cases error prone. This is especially true if the analytical method being tested requires the measurement of multiple components. Continue reading

有机化学教学有怎样的变化?

传统的教学方式指导有机化学的学生们使用标准的离线分析方法来分析化学反应,使用像高效液相色谱(HPLC)、核磁共振(NMR)、和气相色谱(GC)分析手段。

尽管这些分析手段提供最终产品的特性,它们不提供关于反应机理、中间产物或副产物的关键反应信息。通过ReactIR进行原位FTIR分析可在反应进行的同时实时分析和显现不同关键反应成分浓度的变化。这种信息使有机化学学生们得知并理解整个反应的动态过程,乃至反应途径和机理,从而大大增强教学效果。

http://cn.mt.com/cn/zh/home/events/webinar/live/chemistry5.html?=US_AC_eAdv_zhBlog

“梅特勒-托利多的ReactIR改变了我教有机化学的方法。它的实时分析能力使我可以设计出更有激励性的教学实验,把学生们的注意力放在一个有机反应过程中在发生什么。就像观看一个化学反应的电影,当他们眼睁睁地看着反应物在消失同时产物在生成学生们感到惊奇。”
John Sowa
有机和金属有机化学教授
Seton Hall大学

在十一月十七日的“将原位FTIR分析用于有机化学的新进展” 网络研讨会中,Paul Scholl将谈论在教学研究上通过ReactIR进行原位FTIR分析是怎样得到利用的。

Use of Process Analytical Technology (PAT) for Biotech

Process Analytical Technology (PAT) for Biotech: A Review of Recently Reported Applications in Fermentation and BioProcessing

Fermentation and bioprocessing play critical roles in the discovery and manufacture of new pharmaceuticals and specialty chemicals, and in the sustainable production of bulk fuels and commodity chemicals. Yet fermentation processes are often operated with a minimal level of monitoring and control, limiting the ability to optimize yields and production rates. Continue reading

如何在现实反应条件下进行化学研究

使用像高压液相色谱(HPLC)、核磁共振(NMR)、和气相色谱(GC)这些传统离线方法来分析化学反应有一个共同的问题:当分析样品从反应体系里取出之后,样品的成分或性质很可能已不代表反应体系里的真实状况,因而导致明显的分析误差。原位傅立叶变换红外(FTIR)分析是解决这种问题的方法。使用原位FTIR分析来在反应器中的现实条件下进行化学研究是理想的,因为它避免传统取样分析法带来的时间滞后和各种误差。

用ReactIR实时原位分析化学反应今天,我想回答一个常提出的问题:

为何用原位FTIR分析取代离线分析方法进行化学反应分析?

  • 一个实际存在的关键的中间产物在离线样品里可能已经消失了
  • 取样时不小心或不可避免引入的空气可以改变化学条件
  • 因反应毒性之高需要防止接触反应体系
  • 反应在高压和/或极高温度下进行 — 取样可能改变化学成份,致使分析不合格

原位FTIR分析可用于分析几乎所有化学反应,包括:

  • 腐蚀性化学反应
  • 高温高压反应
  • 固液多项反应体系
  • 带水或有机溶剂的反应体系
  • 酸性或碱性反应体系

十一月十七日, Paul Scholl 将在“学术界在有机化学方面使用实时原位FTIR的新进展”网络研讨会中更具体地讲解本论题。Paul会谈论以下领域里近来发表的使用原位FTIR分析来更好地理解化学反应的案例: 有机合成、催化、金属有机、高分子合成、及反应动力学。

How Has Organic Chemistry Changed in Academia?

Traditionally, organic chemistry students have been instructed to analyze reactions using standard offline analytical methods, such as High-Performance Liquid Chromatography (HPLC), Nuclear Magnetic Resonance (NMR) Spectroscopy, and Gas Chromatography (GC).

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How To Study Chemistry Under Actual Reaction Conditions

Traditional offline methods to analyze reaction chemistry, such as High-Performance Liquid Chromatography (HPLC), Nuclear Magnetic Resonance (NMR) Spectroscopy, and Gas Chromatography (GC), share a common problem: when a sample is removed for analysis, it may be altered or compromised resulting in significant analytical errors. The solution for this is Continue reading

How To Overcome Process Scale-Up Challenges Using Process Analytical Technology (PAT)

Process Analytical Technology for Scale-up

Process Analytical Technology

During Part I of his two part The Role of Process Analytical Technology (PAT) in Green Chemistry and Green Engineering online seminar series, Dominique Hebrault discussed scale-up challenges faced today by chemists and engineers.  Too often, offline sampling methods – mostly chromatographic methods such as High Performance Liquid Chromatography (HPLC) or Gas Chromatography (GC) – are used to monitor processes which fail to resolve common issues like reaction monitoring, poor mass balance, delayed initiation/reaction stalled, and loss of yield/by-products.  From a reaction engineering standpoint, obtaining heat mass balance information and preliminary kinetic data can be difficult using traditional offline methods during process scale-up.  Forming the final solid can be challenging using traditional offline methods, including filtration/drying a bottleneck, excessive washing, polymorph inconsistency, and batch to batch variability can be difficult.
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