Chinese Journal of Chromatography ›› 2019, Vol. 37 ›› Issue (10): 1118-1123.DOI: 10.3724/SP.J.1123.2019.03033

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Determination of N,N'-ethylenediamine disuccinic acid in bioconversion reaction solution using high performance liquid chromatography

WU Zhichao1, WU Enguo2, YANG Zhongyi1, TAO Yuxiang3, CHEN Tan1, ZHONG Yongjun1   

  1. 1. Taizhou University, Taizhou 318000, China;
    2. Zhejiang Hisun Pharmaceutical Co., Ltd., Taizhou 318000, China;
    3. Taizhou Bona Chemical Co., Ltd., Taizhou 318000, China
  • Received:2019-03-26 Online:2019-10-08 Published:2020-12-11
  • Supported by:
    Taizhou Science and Technology Program Project (Nos. 162gy47, 1701ny06); Taizhou Education Planning Project (No. gg19007).

Abstract: A method was developed for the determination of N,N'-ethylenediamine disuccinic acid (EDDS) in bioconversion samples by high performance liquid chromatography (HPLC). An InertSustain AQ-C18 column (250 mm×4.6 mm, 5 μm) was used in the analysis. The mobile phase was 25% (v/v) methanol with 1.0 g/L Cu(CO2CH3)2·H2O, 2.0 g/L tetrabutylammonium hydroxide, and the pH was adjusted to 2.80 with phosphoric acid. The flow rate of the mobile phase was 1.0 mL/min, and the column temperature was set at 30℃. The detection wavelength was 254 nm. EDDS, fumaric acid, citric acid, malic acid and ethylenediaminetetraacetic acid (EDTA) were separated from one another within 8 min. EDDS showed good linearity in the range of 0.06-0.6 g/L. About 0.25 g/L EDDS was detected in the biosynthesis reaction solution catalyzed by recombinant EDDS-lyase, while 36.56 g/L malic acid was formed as the by-product from fumaric acid. The catalytic activity of the enzyme was confirmed in the hydrolysis of 10 g/L EDDS, which produced 3.05 g/L malic acid in 3 h. This analytical method is simple, rapid, sensitive, reliable, and suitable for the analysis in the research of EDDS bioconversion process.

Key words: high performance liquid chromatography (HPLC), reversed-phase ion pair chromatography, bioconversion, chelating agent, N,N'-ethylenediamine disuccinic acid (EDDS)

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