cis-Khellactone
cis-Khellactone is a natural product from Angelica sinensis.
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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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Chem Pharm Bull (Tokyo). 2010 Apr;58(4):546-8.
Two new coumarins from the chloroform extract of Angelica urumiensis from Iran.[Pubmed:
20410639]
The aerial parts of several Angelica species of the Apiaceae as natural medicine, are rich sources of various coumarins with biological, to a lesser extent, toxicological activities.
METHODS AND RESULTS:
From the chloroform extract of the aerial parts of Angelica urumiensis MOZAFF. two new coumarins (1, 2), together with six known coumarins and two known flavonoids were isolated. On the basis of comprehensive spectroscopic analyses, including electron ionization-mass spectra (EI-MS), (1)H-NMR, (13)C-NMR, 1D nuclear Overhauser effect (NOE), distortionless enchancement by polarization transfer (DEPT), H, H correlation spectroscopy (COSY), heteronuclear multiple quantum coherence (HMQC), heteronuclear multiple bond correlation (HMBC), rotating frame Overhauser enhancement spectroscopy (ROESY) spectra and comparison with spectral data of known compounds, the structure of new compounds were established as pyranocoumarin dimmer (1) and (+)-8,9-dihydro-8-(2-hydroxypropan-2-yl)-2-oxo-2H-furo[2,3-h]chromen-9-yl-3-methylbut-2-enoate (2). The eight known compounds (3-10) were isosamidin, laserpitin, pteryxin, isolaserpitin, cis-Khellactone, angelicin, genkwanin and salvigenin, respectively. These known structures are isolated from the aerial parts of A. urumiensis for the first time.
CONCLUSIONS:
Antioxidant activities of the two new coumarins were evaluated by using 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging assay and exhibited a moderate antioxidant activity.
