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.
Tetrahedron,1994,50( 7):2231–2240.
Lignans and neolignans from stems and fruits of Piper wightii[Reference:
WebLink]
METHODS AND RESULTS:
Two new neolignans, (7R,8R,3′R)-7-acetoxy-3′,4′-dimethoxy-3,4-methylenedioxy-6′-oxo-Δ-1′,4′,8′-8.3′-lignan (1) and (7R,8R,3′R)-7-hydroxy-3′,4′-dimethoxy-3,4-methylenedioxy-6′-oxo-Δ-1′,4′,8′-8.3′-lignan (2) were isolated from the petroleum ether extract of stems of Piper wightii Miq. The structure were elucidated on the basis of their spectroscopic analysis and chemical transformation. Additionally five known neolignans, isodihydrofutoquinol A (3) and isodihydrofutoquinol B (4), Lancifolin C (5) and D (6) and wallichinine (7) and two known α,α'-diaryl-β,β'-dimethyltetrahydrobenzofuran lignans, calopiptin (8) and machilin G (9), were isolated for the first time from Piper wightii.
CONCLUSIONS:
The new neolignan 2, isodihydrofutoquinol B (4), Lancifolin C (5) and wallichinine (7) were also isolated from the methanolic extract of fruits of the same species alongwith gelbelgin (10), also a known lignan of the tetrahydrobenzofuran type.
