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HPLC system for determination of astragalin at 267 nm. Typical HPLC chromatograms of (a) astragalin standard at 20 µg/mL, (b) MO leaf extract (3 mg/mL), (c) MO lozenges, (d) MO + CC lozenges, (e,f) astragalin standard and CC extract (3 mg/mL), respectively.
