Planta Med 2008; 74 - PC66
DOI: 10.1055/s-0028-1084584

Development of an automated HPLC- DAD- radical scavenging detection system with on-line sample enrichment

Q Zhang 1, 2, HG Janssen 3, EJC van der Klift 1, TA van Beek 1
  • 1Natural Products Chemistry Group, Laboratory of Organic Chemistry, Wageningen University, Dreijenplein 8, 6703 HB Wageningen, Netherlands
  • 2College of Forestry, Northwest A&F University, Taicheng Road 3, 712100 Yangling, Shaanxi, China
  • 3Unilever Research and Development, Advanced Measurement and Imaging, Olivier van Noortlaan 120, 3133 AT, Vlaardingen, Netherlands

An HPLC-DAD-radical scavenging detection system for the rapid on-line identification of antioxidants in complex plant extracts has been developed in our lab [1–3]. To increase its sensitivity and to further decrease the manpower input an additional automated on-line sample enrichment system is presented. With this system injection, enrichment and separation is controlled by computer and by connection with an ABTS radical solution pump detection and identification of antioxidants in fruit juices, vegetables, and processed foods is possible. Trap breakthrough and reproducibility of retention time and area were calculated. The maximum injection volume is 200µL, the intraday day variability (n=3) of retention time and area varied from 0.1%-2.1% and from 0.5%-16%. Within days a RSD (n=3) of retention time and peak area of 0.1%-2.2% and from 1.2% to 28% was observed, respectively. By means of a splitter, a mass spectrometer can be added for structure elucidation. Using this method, various samples were investigated. Their profiles revealed more radical scavenging compounds than previously found because of the larger injection volume and sample enrichment. The fingerprints allow following the fate of antioxidants during processing or storage, as well as variations between batches of the same fruits or commercial food products. Automated data processing will be pursued.

Acknowledgements: China Scholarship Council

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