Shikonofuran A
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.
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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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Chemical and Pharmaceutical Bulletin (Tokyo)1982 30(12): 4407-4411
Shikon 3. new furyl hydro quinone derivatives shikono furans a b c d and e from lithospermum erythrorhizon[Reference:
WebLink]
METHODS AND RESULTS:
Five new furylhydroquinone derivatives, named shikonofurans A, B, C, D and E, were found in the root of Lithospermum erythrorhizon (Boraginaceae). Shikonofuran A had the structure I, shown in chart 1, by direct comparison of the spectral data of its diacetate with those of echinofuran leucoacetate. The structures of the other compounds were established on the basis of spectral and chemical evidence as II [B], III [C], IV [D] and V [E], shown in chart 1.
