Oxyresveratrol-2-O-beta-D-glucopyranoside shows better tyrosinase inhibitory activities than kojic acid.
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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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Inhibitory effects of constituents from Morus alba var. multicaulis on differentiation of 3T3-L1 cells and nitric oxide production in RAW264.7 cells.[Pubmed: 21772233
METHODS AND RESULTS:
A new arylbenzofuran, 3',5'-dihydroxy-6-methoxy-7-prenyl-2-arylbenzofuran (1), and 25 known compounds, including moracin R (2), moracin C (3), moracin O (4), moracin P (5), artoindonesianin O (6), moracin D (7), alabafuran A (8), mulberrofuran L (9), mulberrofuran Y (10), kuwanon A (11), kuwanon C (12), kuwanon T (13), morusin (14), kuwanon E (15), sanggenon F (16), betulinic acid (17), uvaol (18), ursolic acid (19), Î²-sitosterol (20), oxyresveratrol 2-O-Î²-D-glucopyranoside (21), mulberroside A (22), mulberroside B (23), 5,7-dihydroxycoumarin 7-O-Î²-D-glucopyranoside (24), 5,7-dihydroxycoumarin 7-O-Î²-D-apiofuranosyl-(1â†’6)-O-Î²-D-glucopyranoside (25) and adenosine (26), were isolated from Morus alba var. multicaulis Perro. (Moraceae). Their structures were determined by spectroscopic methods. The prenyl-flavonoids 11-14, 16, triterpenoids 17,18 and 20 showed significant inhibitory activity towards the differentiation of 3T3-L1 adipocytes.
The arylbenzofurans 1-10 and prenyl-flavonoids 11-16 also showed significant nitric oxide (NO) production inhibitory effects in RAW264.7 cells.
Three major metabolites of mulberroside A in rat intestinal contents and feces.
Three major metabolites of mulberroside A in rat intestinal contents and feces.[Pubmed: 19787570
Mulberroside A, a major stilbene constituent of MORUS ALBA L. (Moraceae), displays significant antitussive and antiasthmatic effects in animals.
METHODS AND RESULTS:
As part of our ongoing research on its biotransformation in rats, mulberroside A was orally administered to rats, and the metabolites in the gastrointestinal contents and feces were investigated. Three major metabolites were isolated from the feces of rats and identified as oxyresveratrol-2- O- beta- D-glucopyranoside ( 1), oxyresveratrol-3'- O- beta- D-glucopyranoside ( 2), and oxyresveratrol ( 3) on the basis of chemical and spectroscopic evidence. The three metabolites were also detected in the small intestinal contents of rats following oral administration of mulberroside A.
These findings suggest that mulberroside A is metabolized prior to absorption into the body.
J Agric Food Chem. 2010 May 12;58(9):5368-73. doi: 10.1021/jf1003607.
Tyrosinase inhibitory constituents from the roots of Morus nigra: a structure-activity relationship study.[Pubmed: 20297841
The phytochemical profiles of Morus nigra roots and twigs were compared by HPLC with those of the old and young twigs of Morus alba which are known to contain oxyresveratrol and mulberroside A as major components. It was found that M. nigra root extract contains some unknown natural products with potential tyrosinase inhibitory activity.
METHODS AND RESULTS:
The extract (95% ethanol) of the roots of M. nigra was further investigated in this study. One new compound, 5'-geranyl-5,7,2',4'-tetrahydroxyflavone, and twenty-eight known phenolic compounds were isolated. Their structures were identified by mass spectrometry and NMR spectroscopy. Nine compounds, 5'-geranyl-5,7,2',4'-tetrahydroxyflavone, steppogenin-7-O-beta-D-glucoside, 2,4,2',4'-tetrahydroxychalcone, moracin N, kuwanon H, mulberrofuran G, morachalcone A, oxyresveratrol-3'-O-beta-D-glucopyranoside and oxyresveratrol-2-O-beta-D-glucopyranoside, showed better tyrosinase inhibitory activities than kojic acid.
It was noteworthy that the IC(50) values of 2,4,2',4'-tetrahydroxychalcone and morachalcone A were 757-fold and 328-fold lower than that of kojic acid, respectively, suggesting a great potential for their development as effective natural tyrosinase inhibitors.