Xanthohumol B
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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Phytochemistry. 1997 Oct;46(4):683-7.
Xanthohumols, diacylglycerol acyltransferase inhibitors, from Humulus lupulus.[Pubmed:
9366096]
A methanol extract of hops of Humulus lupulus (L.) showed inhibitory activity against rat liver diacylglycerol acyltransferase (DGAT).
METHODS AND RESULTS:
From DGAT inhibitory activity-guided fractionation, two chalcones were isolated.
One was identified as xanthohumol and the other was found to be a new product designated Xanthohumol B. The structure of Xanthohumol B was shown to be 6-[3,4-dihydro-3,5-dihydroxy-7-methoxy-2,2-dimethyl-2H-benzo[b]pyrano ]- 3-(4-hydroxyphynyl)-2-propen-l-one by spectroscopic studies including various NMR measurements. Xanthohumol and Xanthohumol B inhibited DGAT activity with IC50 values of 50.3 and 194 microM in rat liver microsomes, respectively.
CONCLUSIONS:
They showed preferential inhibition of triacylglycerol formation in intact Raji cells, indicating that they inhibit DGAT activity preferentially in living cells.
