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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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Diacetoxy-substituted polyacetylenes from Atractylodes lancea.[Reference: WebLink
METHODS AND RESULTS:
Six new polyacetylenes have been isolated from the rhizomes of Atractylodes lancea. Besides 1-(2-furyl)-(7E)-nonene-3,5-diyne-1,2-diacetate, a new natural compound, two further vicinal diacetoxyalkenynes were postulated as erythro- and threo-forms of (1,5E, 11E)-tridecatriene-7,9-diyne-3,4-diacetate in comparison with similar structures in the literature. Three other constituents turned out to be (3E,5E,11E)-tridecatriene-7,9-diyne-1,2-diacetate together with its (3Z)- and (5Z)-isomers.
All structures were established by UV, EI-mass spectrometry, 1D and 2D NMR experiments.