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Analysis of Notoginseng with Rapid Resolution Liquid Chromatography

Zhixiu Xu*(1), Herbert Godel (2)

(1) Agilent Technologies Shanghai, 200131 P.R. China

(2) Agilent Technologies Germany, 76337 Waldbronn, Germany

Introduction

Notoginseng, one of the most famous TCMs in China for its efficiency in promoting blood circulation, removing blood stasis and so on attracted more and more attention recently. How to analysis suck kind of TCM is a big issue nowadays because of the complex components and matrix. With steps moving on the modenization of TCMs, analysis of TCMs rely heavily on instrumental separations and the performance of these separations. The typical run time for the analysis of notoginseng is longer than 60 minutes. When sample throughput is an issue, having similar or better performance with shorter analysis times is an ideal solution and reduced the cost of solvent as well as improved the overall analysis process.

In this study a rapid resolution liquid chromatography (RRLC) method for the analysis of notoginseng was developed. The conventional HPLC analysis method was transferred easily to RRLC using Agilent’s method translator. Different extraction methods were used to produce different samples from different parts of the notoginseng plant. This Application Note also shows the quantitative results. Using the faster and better methods developed in this study, quality control departments will be able to reduce analysis times and increase sample throughput. RRLC methods also give users the benefits of time and solvent savings. For manufacturing quality control, using RRLC means batches of products can be released faster compared with using conventional HPLC methods.

Discussion and results

Instrumentation

The peaks in figure 3 were narrower than those in figure 2. This means that the peak capacity increased for the complex samples. The resolution or separation performance of the RRLC analysis was better than conventional HPLC. At the same time the run time was reduced dramatically from 60 to 20 minutes. In this study peak profiles and elution sequence were the same so that it was not necessary to identify the peaks again in the new chromatogram. Further, the UV spectra from the diode array detector helped to do further confirmation.

For less complex samples like NRME, the faster method can be used to complete the analysis in a shorter time. Figure 4. shows the comparison of chromatogram of NRME with the RRLC method N0.1 and No.2

  • Agilent 1200 Series binary pump SL with vacuum degasser

  • Agilent 1200 Series high-performance autosampler SL

  • Agilent 1200 Series thermostatted column compartment SL

  • Agilent 1200 Series diode array detector SL with micro flow cell (2 µL volume, 3 mm path length)

  • Agilent ChemStation B.02.01 SR1 for data acquisition and evaluation

  • Agilent ZORBAX XDB C18 RRHT column, 4.6 x 50 mm, 1.8 µm particle size

Figure 2 Chromatogram of NCLE analyzed using a conventional HPLC method on an Agilent 1100 Series LC system.

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Samples:

Notoginseng caudexes and leaf extracts (NCLE)

Notoginseng root extracts (NRE)

Notoginseng raw medicine extracts(NRME)

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Figure 3 Chromatogram of NCLE, analyzed using RRLC method 1 on an Agilent 1200 Series RRLC system

Method translation

To transfer the traditiona HPLC method to RRLC method,Agilent’s method translator (PN:5989-5130EN) was used for this purpose and made the process easy and quick, see figure 1.

Figure 1 Agilent’s method translator for transfer of standard HPLC methods to RRLC technology.

RRLC method

Column: Agilent ZORBAX XDB-C18, 4.6 x 50 mm, 1.8 µm particle size

Mobile phase: A: Water; B: CAN

Injection volume: 5 µL

Diode array detection: 203 nm ±8 nm, Ref. 360 nm ±100 nm, 2 mm path length micro flow cell

Gradient No.1: 0 min, 20 %B; 3 min, 30 %B; 7 min, 35 %B; 10 min, 40 %B, 13 min, 60 %B; 17 min, 100 %B and hold for 3 minutes

Flow rate: 1.0 mL/min

Gradient No.2: 0 min, 30 %B; 2.5 min, 60 %B; 5 min, 100 %B and hold for 1 min

Flow rate: 2.5 mL/min

Figure 4 Chromatogram of NRME, analyzed using RRLC method No.1 (blue) an RRLC method No.2(orange) on an Agilent 1200 Series RRLC system.

Quantitative results

DISEC

Agilent Restricted


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