Macrophylloside D
Reference standards.
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Providing storage is as stated on the product vial and the vial is kept tightly sealed, the product can be stored for up to
24 months(2-8C).
Wherever possible, you should prepare and use solutions on the same day. However, if you need to make up stock solutions in advance, we recommend that you store the solution as aliquots in tightly sealed vials at -20C. Generally, these will be useable for up to two weeks. Before use, and prior to opening the vial we recommend that you allow your product to equilibrate to room temperature for at least 1 hour.
Need more advice on solubility, usage and handling? Please email to: service@chemfaces.com
The packaging of the product may have turned upside down during transportation, resulting in the natural compounds adhering to the neck or cap of the vial. take the vial out of its packaging and gently shake to let the compounds fall to the bottom of the vial. for liquid products, centrifuge at 200-500 RPM to gather the liquid at the bottom of the vial. try to avoid loss or contamination during handling.
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J Sep Sci. 2016 Dec;39(24):4723-4731.
Efficient methods for isolating five phytochemicals from Gentiana macrophylla using high-performance countercurrent chromatography.[Pubmed:
27774729 ]
METHODS AND RESULTS:
Efficient high-performance countercurrent chromatography methods were developed to isolate five typical compounds from the extracts of Gentiana macrophylla. n-Butanol-soluble extract of G. macrophylla contained three hydrophilic iridoids, loganic acid (1), swertiamarin (2) and gentiopicroside (3), and a chromene derivative, Macrophylloside D (4) which were successfully isolated by flow rate gradient (1.5 mL/min in 0-60 min, 5.0 mL/min in 60-120 min), and consecutive flow rate gradient HPCCC using n-butanol/0.1% aqueous trifluoroacetic acid (1:1, v/v, normal phase mode) system. The yields of 1-4 were 22, 16, 122, and 6 mg, respectively, with purities over 97% in a flow rate gradient high-performance countercurrent chromatography, and consecutive flow rate gradient high-performance countercurrent chromatography gave 1, 2, 3 (54, 41, 348 mg, respectively, purities over 97%) and 4 (13 mg, purity at 95%) from 750 mg of sample. The main compound in methylene chloride soluble extract, 2-methoxyanofinic acid, was successfully separated by n-hexane/ethyl acetate/methanol/water (4:6:4:6, v/v/v/v, flow-rate: 4 mL/min, reversed phase mode) condition.
CONCLUSIONS:
The structures of five isolates were elucidated by 1 H, 13 C NMR and ESI-Q-TOF-MS spectroscopic data which were compared with previously reported values.
