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. 2020 Aug 31;412(25):6789–6809. doi: 10.1007/s00216-020-02839-7

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© The Author(s) 2020

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Fig. 2 — Chromatograms of hydrolyzed GbE unfinished samples (GbE A–T), commercial GbE finished products (GbE W–Z), NTP lots (1, 1F), and NIST standard extract (GbE U) and tablet (GbE V), Peak at ~ 58 min in GbE J chromatogram is due to electronic noise in the detector