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.
Acta Chimica Sinica, 1988, 46(5): 483-8.
Studies on the Constituents of Schisandra Henryi Ⅴ. The Structures of Wulignan A1, A2, Epiwulignan A1 and Epischisandrone)[Reference:
WebLink]
METHODS AND RESULTS:
Four new lignan compounds named wulignan A1 (4), A2(5), epiwulignan A1 (6) and epischisandrone(7), and three known lignan compounds, enshicine(1), epienshicine(2) and schisandrone(3), were isolated from the fruits of Schisandra henryi Clarke collected in the district of Yibin, Sichuan Province. In anticancer screening all the four new compounds exhibit the activity against leukemia P-388 in vitro. Wulignan A_1(4), m. p. 195—197℃, [α]_D~(140-38.9°(CHCl_3), wulignan A_2(5), m. p. 235-237℃, [α]_D~(14)-61.2°(CH_3OH), epiwulignan A_1(6), m. p. 185-187℃, [α]_D~(14)+13.1°(CHCl_3), and epischisandrone (7), m. p. 182-183.5℃, [α]_D~(14)+5.5°(CHCl_3), display the features of tetralone lignan in their UV, IR, ~1H NMR (Table 1) and MS spectra.
CONCLUSIONS:
Besides the spectral analysis and NOE measurements, the structure assignments including absolute configurations mainly rely on the chemical transformation of 5, 6 and 7 into known compound, (+)-dimethylguaiacine(6b), and of 4 into known compound, (-)-dimethylisoguaiacine(4b). In addition, the following new compounds, (+)-isootobaphenol (2a), (+)-demethyleneisootobaphenol (2b), Dimethylwulignan A1 (4a) and dimethylepiwulignan A1 (6a) were prepared during the course of the structural elucidation.
