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  6. Ultra-High Performance Liquid Chromatograph ChromasterUltra Rs

Ultra-High Performance Liquid Chromatograph ChromasterUltra Rs

Ultra-High Performance Liquid Chromatograph ChromasterUltra Rs

ChromasterUltra Rs, an ultra-high performance liquid chromatograph, provides the ultimate in high performance, high resolution, and high sensitivity analysis that are becoming requirements for research and development in pharmaceutical and chemical fields.


High Resolution

The newly developed LaChromUltra II column is the longest UHPLC column at 250 mm in length. When used together with the reduced volume system ChromasterUltra Rs, it produces an exceptional high-separation performance.


* EachEach column has its own recommended flow rate range for analysis, and it is advisable to abide by these limits in order to maintain and optimize the separation performance of any column.

The combination of this column and the ChromasterUltra Rs enables system pressure tolerance of 140 MPa with 50,000 or more theoretical plates per column.

High Sensitivity

A total-reflection capillary flow cell is incorporated into the diode array detector to answer to the increasing need for high-sensitivity analysis of hazardous substances, genotoxic impurities, etc. A high-sensitivity flow cell with an optical path length of 65 mm is also available. In addition to the capability of high-sensitivity analysis, carryover is reduced through the use of a double-corkscrew mixer.

High-sensitivity total-reflection capillary flow cell

The diode array detector (DAD) exhibits low noise and low drift, achieved through the use of a new optical system providing optimal conditions for high-sensitivity analysis. The optional high-sensitivity flow cell (optical path length of 65 mm) further enhances sensitivity; about a tenfold increase is obtained compared with our previous model (LaChromUltra), thus enabling high-sensitivity applications including impurities from side reactions, genotoxic impurities, etc.

The acquisition of impurity profiles during all stages of synthesis and in raw materials used in medicines and chemicals, intermediate byproducts, and finished drugs are examples of useful applications.


Double-corkscrew mixer

The binary pump is equipped with the latest design in microfluidic double-corkscrew mixers.
An efficient mixing is attained even for a low volume, resulting in a baseline that is extremely stable during gradient analysis, enabling higher-sensitivity analysis.


Structure of the double-corkscrew mixer:
Repeated branching and merging of channels within the mixer provide effective solvent mixing (mixer volume of 55 µL).

Column LaChromUltra II C18(1.9 µm) 2.0 mm I.D.×50 mm L.
Eluent A)0.1% TFA/H2O(v/v)
B)0.1% TFA/CH3CN(v/v)
Flow rate 0.500 mL/min
Detection UV 214 nm


Low carryover (0.001% or less) is attained via the optimized injection port structure.

  • The dead volume of the injection port is reduced
  • High-flow-rate washing is achieved through the use of a wash pump dedicated to the autosampler.
  • Two solvents are used to wash the inner wall of the needle as well as the inside of the injection valve.
  • A back flush function for the injection port is newly incorporated.


GUI Controller (optional)

All modules can be controlled from the Graphical User Interface (GUI) controller.
The GUI is comprised of a color LCD monitor (5.7-inch color TFT display with LED back-light) and a touch panel made for easy viewing and simple operation.
Up to 10 programs including a timer function, pre-analysis tasks (Wakeup), and post-analysis tasks (Sleep) can be created for a system.
The GUI controller enables you to check the status of consumables usage for all units that are connected to the system.


MEM Column fitting (optional)

Hitachi' s own Moment Enhancing Mechanism (MEM) column fitting is a simple but exciting new development. The finger-tight piping integral fitting, which has a very small dead volume, is capable of safely tolerating system pressures as high as 140 MPa.

MEM column fitting
A view of the operation of attaching a column


  • Diode array detector (DAD) system
  • UV-VIS detector system


Stable solvent delivery allows a board range of analyses from UHPLC to HPLC

Stable solvent delivery is achieved, independent of pressure and solvent composition, by incorporating LBT control and correcting the bulk modulus of the solvent. Stable analyses are supported with 5-µm, 3-µm, and 1.9-µm columns.


Excellent reproducibility

Even for gradient analysis

Under high-pressure conditions, highly reproducible high-resolution results are achieved.

Highly reproducible analyses are also possible for analyses of protein digests, which produce numerous peptide peaks.

High-resolution analysis of related substances (impurities)

Erythromycin (a macrolide antibiotic having a basic structure comprised of a 14-membered ring) is used as a sample model for separation of the main component and related substances to compare the separation using an HPLC column vs. the separation using a UHPLC column.

HPLC column [Conditions]
Column LaChrom II C18(5 µm) 4.6 mm I.D.×150 mm L.
Flow rate 1.0 mL/min
Eluent 20 mmol/L Phosphate Buffer/CH3CN/CH3OH=45/40/15
Detection DAD 210 nm
UHPLC column [Conditions]
Column LaChromUltra II C18(1.9 µm) 3.0 mm I.D.×250 mm L.
Flow rate 0.710 mL/min
Eluent 20 mmol/L Phosphate Buffer/CH3CN/CH3OH=45/40/15
Detection DAD 210 nm
More satisfactory separations are attained by the use of the newly developed high resolution column for UHPLC applications.

Introducing the measurement example using liquid chromatograph (HPLC) in various different fields.

The basics of HPLC, from "Principles and system configuration" to "Feature of various detection methods."

Introducing the interview with three engineers who involved in the development and design of Hitachi UHPLC.

The trademark that represents our strong bond with the customer and shows our pledge to connect science and society to create new value.

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