24,25-Epoxytirucall-7-en-3,23-dione
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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Chinese Journal of Botany: English Edition, 2004, 46 (10): 1256-1260.
A new triterpenoid from Amoora dasyclada.[Reference:
WebLink]
METHODS AND RESULTS:
Five compounds were isolated from the EtOH extraction of the stem of Amoora dasyclada (How et T. Chen) C. Y. Wu (Meliaceae).
On the basis of spectroscopic methods, their structures were elucidated as
24, 25-epoxy-tirucall-7-ene-3, 23-dione (24,25-Epoxytirucall-7-en-3,23-dione,1), 24, 25, 26, 27-tetranortirucall-7-ene-3-oxo-23 (21)-lactone (2), taraxerone (3), taraxerol (4) and β-sitosterol (5).
CONCLUSIONS:
Among them, compound 1 was a new triterpenoid, compounds 3-5 were firstly obtained from this plant; compound 2, an tetranortriterpenoid, was firstly isolated from natural sources, and its NMR data were assigned for the first time. Moreover, the Δ7-bond and the Me-14 in compound 2 were never changed, which has never been found in other tetranortriterpenoids. And the biosynthetic pathway of tetranortriterpenoid was further discussed.
