What is Variable Pathlength Technology?

A different approach to concentration measurement

Variable Pathlength Technology (VPT) is UV-based technology that offers efficient analysis methods for both at-line and in-line concentration measurement processes

  • VPT can omit dilution, estimation, and all manual calculations
  • The patented Slope Spectroscopy method provides increased accuracy, high repeatability, and easier implementation
  • VPT can scale down a seven-step process to two key elements: Measure and Report
  • The VPT method efficiently receives multiple linear data points in just under two minutes

Other helpful videos

How is Variable Pathlength Technology different from traditional UV-Vis Spectroscopy?

Traditionally UV-Visible analysis relies on a fixed pathlength at a single datapoint. This requires sample dilution that can vary from analyst to analyst, introducing variability. UV-based Variable Pathlength Technology (VPT) incorporates the Beer-Lambert law into the Slope Spectroscopy Method, where multiple datapoints are acquired due to having pathlength unlocked as a variable. Watch video below to learn more.

What is the difference between CTech SoloVPE and CTech FlowVPX Systems?

Concentration measurement is a critical attribute measurement taken at various stages of the bioprocess workflow. CTech Analytical Solutions provides two VPT spectrophotometer systems that can be used where you need to measure concentration measurement. Whether you want to measure concentration “in-line” or looking for “at-line” or “off-line” solutions, we have a solution for you. Watch the video to learn more.


CTech™ SoloVPE® 系统

近线 GMP 和非 GMP 检测

CTech™ SoloVPE® 系统凭借其独特的专利可变光程技术 (VPT),充分发挥斜率光谱法的强大功能。这种简单但功能强大的可变光程解决方案可提供快速准确的结果,从而避免代价高昂的稀释。

CTech™ FlowVPX® System

In-line GMP testing

新型 CTech FlowVPX® 分光光度计可满足严格的 GMP 监管要求,提供可靠的实时结果,并在下游 GMP 过程的每个阶段均可轻松进行浓度测量。