Guaiacin
(+)-Guaiacin has significant neuroprotective, and anti-inflammatory activities, it can inhibit cyclooxygenase (COX)-1 and COX-2. (+)-Guaiacin shows potent in vitro activities against the release of beta-glucuronidase in rat polymorphonuclear leukocytes (PMNs) induced by platelet-activating factor (PAF), with 42.5-75.6% inhibition at 10(-5) M.
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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.
Need more advice on solubility, usage and handling? Please email to: service@chemfaces.com
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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Chem Biodivers. 2015 Jul;12(7):1057-67.
Biological Evaluation of Secondary Metabolites from the Root of Machilus obovatifolia.[Pubmed:
26172326]
Bioassay-guided fractionation of the root of Machilus obovatifolia led to the isolation of four new lignans, epihenricine B (1), threo-(7'R,8'R) and threo-(7'S,8'S)-methylmachilusol D (2 and 3), and isofragransol A (4), along with 23 known compounds.
METHODS AND RESULTS:
The compounds were obtained as isomeric mixtures (i.e., 2/3 and 4/20, resp.). The structures were elucidated by spectral analyses. Among the isolates, 1, licarin A (12), Guaiacin (14), (±)-syringaresinol (21), and (-)-epicatechin (23) showed ABTS (=2,2'-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) cation radical-scavenging activity, with SC50 values of 11.7±0.5, 12.3±1.1, 11.0±0.1, 10.6±0.3, and 9.5±0.2 μM in 20 min, respectively. In addition, kachirachirol B (17) showed cytotoxicity against the NCI-H460 cell line with an IC50 value of 3.1 μg/ml.
Biol Pharm Bull. 2007 Apr;30(4):814-7.
Stimulatory activity of lignans from Machilus thunbergii on osteoblast differentiation.[Pubmed:
17409528]
Phytoestrogens are naturally occurring compounds exerting estrogenic activity, and include isoflavonoids, flavonoids and lignans.
METHODS AND RESULTS:
In the present study, we evaluated the stimulating activity of six lignans, meso-dihydroguaiaretic acid, nordihydroguaiaretic acid, machilin A, Guaiacin, isoGuaiacin and isoGuaiacin dimethylether, from Machilus thunbergii, on osteoblast differentiation employing primary cultures of mouse osteoblast as an in vitro assay system. Among the six lignans tested, arylnaphthalene type lignans such as Guaiacin, isoGuaiacin and isoGuaiacin dimethylether significantly increased alkaline phosphatase activity, whereas bibenzylbutane type lignans such as meso-dihydroguaiaretic acid, nordihydroguaiaretic acid and machilin A showed little effects. IsoGuaiacin and isoGuaiacin dimethylether also increased collagen synthesis as well as calcium deposition. In addition, treatment of the mouse osteoblasts with tamoxifen markedly reduced ALP activity increased by isoGuaiacin or isoGuaiacin dimethylether, suggesting the involvement of estrogen receptor in the action of these lignans on osteoblast differentiation.
CONCLUSIONS:
Taken together, these results suggest that arylnaphthalene type lignans such as Guaiacin, isoGuaiacin and isoGuaiacin dimethylether significantly increase osteoblast differentiation.
J. Agr. Food Chem., 2007, 55(7):2569-74.
Lipoperoxidation and cyclooxygenases 1 and 2 inhibitory compounds from Iryanthera juruensis.[Pubmed:
17335225 ]
Plants from Iryanthera genus have been traditionally used as food supplements by South American Indians.
METHODS AND RESULTS:
The MeOH extract of leaves of Iryanthera juruensis, one of the plants endemic to the Amazon region and consumed in Brazil, and the hexane extract from its seeds inhibited lipid peroxidation (LPO) and cyclooxygenase (COX-1 and -2)) enzymes in in vitro assays. Further analyses of these extracts yielded 5-deoxyflavones (1-5) from the leaf extract and sargachromenol (6), sargaquinoic acid (7), a novel juruenolic acid (8), omega-arylalkanoic acids (9a-c), and the lignan Guaiacin (10) from the seed extract. Compounds 3-5 inhibited LPO by 86%, 77%, and 88% at 10 ppm, respectively, and compounds 6 and 9a-c showed inhibition at 76% and 78% at 100 ppm, respectively. However, compounds 7 and 8 were inactive and lignan 10 exhibited LPO inhibitory activity by 99% at 100 ppm compared to commercial antioxidants butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), and vitamin E. The flavones 1-5 also inhibited COX-1 and -2 enzymes by 50-65% at 100 ppm. Compound 6 showed high but nonselective inhibition of COX-1 and COX-2 enzymes, when compared to aspirin and Celebrex, a nonsteroidal anti-inflammatory drug (NSAID). Compounds 7 and 10 inhibited COX-1 by 60% and 65% and COX-2 by 37% and 18%, respectively, whereas compounds 8 and 9a-c showed little or no activity against these enzymes.
