Resveratrol
 | |
 | |
 Chemical structures of cis- ((Z)-resveratrol, left) and trans-resveratrol ((E)-resveratrol, right)[1] | |
| Names | |
|---|---|
| Other names
trans-3,5,4'-Trihydroxystilbene; 3,4',5-Stilbenetriol; trans-Resveratrol; (E)-5-(p-Hydroxystyryl)resorcinol; (E)-5-(4-hydroxystyryl)benzene-1,3-diol | |
| Identifiers | |
501-36-0  | |
| ChEBI | CHEBI:45713 |
| ChEMBL | ChEMBL165 |
| ChemSpider | 392875 |
| DrugBank | DB02709 |
| Jmol interactive 3D | Image |
| KEGG | C03582 |
| PubChem | 445154 |
| RTECS number | CZ8987000 |
| UNII | Q369O8926L |
| |
| |
| Properties | |
| C14H12O3 | |
| Molar mass | 228.25 g·mol−1 |
| Appearance | white powder with slight yellow cast |
| Melting point | 261 to 263 °C (502 to 505 °F; 534 to 536 K)[2] |
| Solubility in water | 0.03 g/L |
| Solubility in DMSO | 16 g/L |
| Solubility in ethanol | 50 g/L |
| UV-vis (λmax) | 304nm (trans-resveratrol, in water) 286nm (cis-resveratrol, in water)[1] |
| Hazards | |
| Safety data sheet | Fisher Scientific[2] Sigma Aldrich[3] |
| R-phrases | R36 (irritating to eyes)[3] |
| S-phrases | S26 (in case of contact with eyes, rinse immediately with plenty of water and
seek medical advice)[3] |
| Lethal dose or concentration (LD, LC): | |
| LD50 (Median dose) |
23.2 µM (5,29 g)[4] |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
verify (what is  ?) | |
| Infobox references | |
Resveratrol (3,5,4'-trihydroxy-trans-stilbene) is a stilbenoid, a type of natural phenol, and a phytoalexin produced naturally by several plants in response to injury or when the plant is under attack by pathogens such as bacteria or fungi.[5] Food sources of resveratrol include the skin of grapes, blueberries, raspberries, and mulberries.[6] As of 2015, there is limited evidence of health effects in humans.
Health effects
Heart disease
There is little evidence of benefit from resveratrol in those who already have heart disease.[7] A 2014 meta-analysis found that resveratrol supplementation at usual doses has no effect on blood pressure but may help if high doses are used.[8]
Cancer
As of 2014, evidence of an effect of resveratrol on cancer in humans is inconsistent.[9]
Metabolism
There is very little human evidence of an effect of resveratrol on metabolism.[10] Tentative data supports a potential benefit in controlling some biomarkers in diabetes but further evidence is needed before it can be recommended.[11]
Lifespan
The effect of resveratrol on lifespan in humans is unclear as of 2011.[12]
Adverse effects
Long-term effects of using resveratrol are currently unknown but clinical trials have shown that it is well tolerated during the trials.[8][11]
Discovery and name
The first mention of resveratrol was in a Japanese article in 1939 by Michio Takaoka, who isolated it from the poisonous, but medicinal, Veratrum album, variety grandiflorum.[13] The name presumably comes from the fact that it is a resorcinol derivative coming from a Veratrum species.[14] In 2003, D. Sinclair from Harvard Medical School reported in Nature that resveratrol activated sirtuins in yeast cells. This was immediately followed by the launch of Sirtris Pharmaceuticals. While pharmacological effects of resveratrol did not turn out to be commercially viable, their discovery led to efforts to develop other types of SIRT genes' activators.
Pharmacokinetics
One way of administering resveratrol in humans may be buccal delivery, that is without swallowing, by direct absorption through tissues on the inside of the mouth. When one milligram of resveratrol in 50 ml 50% alcohol/ water solution was retained in the mouth for one minute before swallowing, 37 ng/ml of free resveratrol were measured in plasma two minutes later. This level of unchanged resveratrol in blood can only be achieved with 250 mg of resveratrol taken in a pill form.[15] However, the viability of a buccal delivery method is called into question due to the low aqueous solubility of the molecule. For a drug to be absorbed transmucosally it must be in free-form or dissolved.[16][17] Resveratrol fits the criteria for oral transmucosal dosing, except for this caveat. The low aqueous solubility greatly limits the amount that can be absorbed through the buccal mucosa. Resveratrol that is attempted to be taken buccally was expected to pass through the mucous membrane of the mouth and be absorbed as an oral dose,[18] however, the need to explore buccal delivery in future pharmaceutical formulations was expressed.[17][19]
While 70% of orally administered resveratrol is absorbed its oral bioavailability is approximately 0.5% due to extensive hepatic glucuronidation and sulfation.[20] Only trace amounts (below 5 ng/ml) of unchanged resveratrol could be detected in the blood after 25 mg oral dose.[20] Even when a very large dose (2.5 and 5 g) was given as an uncoated pill, the concentration of resveratrol in blood failed to reach the level claimed to be necessary for the systemic cancer prevention.[21] A formulation of resveratrol in a chewing gum form is now in production, and this would be expected to achieve much higher blood levels than oral formulations. Resveratrol given in a proprietary formulation SRT-501 (3 or 5 g), developed by Sirtris Pharmaceuticals, reached five to eight times higher blood levels. These levels did approach the concentration necessary to exert the effects shown in animal models and in vitro experiments.[22] On May 5, 2010, however, GlaxoSmithKline (GSK) said it had suspended a small clinical trial of SRT501, a proprietary form of resveratrol, due to safety concerns, and terminated the study on December 2, 2010.[23]
In humans and rats less than 5% of the oral dose was observed as free resveratrol in blood plasma.[20][21][24][25][26] The most abundant resveratrol metabolites in humans, rats, and mice are trans-resveratrol-3-O-glucuronide and trans-resveratrol-3-sulfate.[27] Walle suggests sulfate conjugates are the primary source of activity,[20] Wang et al. suggests the glucuronides,[28] and Boocock et al. also emphasized the need for further study of the effects of the metabolites, including the possibility of deconjugation to free resveratrol inside cells. Goldberd, who studied the pharmacokinetics of resveratrol, catechin and quercetin in humans, concluded "it seems that the potential health benefits of these compounds based upon the in vitro activities of the unconjugated compounds are unrealistic and have been greatly exaggerated. Indeed, the profusion of papers describing such activities can legitimately be described as irrelevant and misleading. Henceforth, investigations of this nature should focus upon the potential health benefits of their glucuronide and sulfate conjugates."[29]
The hypothesis that resveratrol from wine could have higher bioavailability than resveratrol from a pill[30][31] has been refuted by experimental data.[29][32] For example, after five men took 600 ml of red wine with the resveratrol content of 3.2 mg/l (total dose about 2 mg) before breakfast, unchanged resveratrol was detected in the blood of only two of them, and only in trace amounts (below 2.5 ng/ml). Resveratrol levels appeared to be slightly higher if red wine (600 ml of red wine containing 0.6 µg/ml resveratrol; total dose about 0.5 mg) was taken with a meal: trace amounts (1–6 ng/ml) were found in four out of ten subjects.[32] In another study, the pharmacokinetics of resveratrol (25 mg) did not change whether it was taken with vegetable juice, white wine, or white grape juice. The highest level of unchanged resveratrol in the serum (7–9 ng/ml) was achieved after 30 minutes, and it completely disappeared from blood after four hours.[29] The authors of both studies concluded the trace amounts of resveratrol reached in the blood are insufficient to explain the French paradox. The beneficial effects of wine apparently could be explained by the effects of alcohol[29] or the whole complex of substances wine contains;[32] for example, the cardiovascular benefits of wine appear to correlate with the content of procyanidins.[33]
Mechanisms of action
In cells treated with resveratrol, a fourteen-fold increase in the action of MnSOD (SOD2) is observed.[41] MnSOD reduces superoxide to hydrogen peroxide (H2O2), but H2O2 is not increased due to other cellular activity. Superoxide O2− is a byproduct of respiration in complexes 1 and 3 of the electron transport chain. It is "not highly toxic, [but] can extract an electron from biological membrane and other cell components, causing free radical chain reactions. Therefore it is essential for the cell to keep superoxide anions in check."[42] MnSOD reduces superoxide and thereby, confers resistance to mitochondrial dysfunction, permeability transition, and apoptotic death in various diseases.[43] It has been implicated in lifespan extension, inhibits cancer, (e.g. pancreatic cancer)[44][45] and provides resistance to reperfusion injury and irradiation damage.[46][47][48] These effects have also been observed with resveratrol. Robb et al. propose MnSOD is increased by the pathway RESV → SIRT1 / NAD+ → FOXO3a → MnSOD. Resveratrol has been shown to cause SIRT1 to cause migration of FOXO transcription factors to the nucleus,[49] which stimulates FOXO3a transcriptional activity [50] and it has been shown to enhance the sirtuin-catalyzed deacetylation (activity) of FOXO3a. MnSOD is known to be a target of FOXO3a, and MnSOD expression is strongly induced in cells overexpressing FOXO3a.[51] It has been reported too that the disproportional up-regulation of superoxide dismutase (SOD), catalse (CAT) and glutathion peroxidase (GPX) expression (high expression of MnSOD, but mild change in CAT or GPX) and their enzymatic activity in cancer cells results in the mitochondrial accumulation of H2O2, which in turn induces cancer cell apoptosis.[52]
Resveratrol interferes with all three stages of carcinogenesis—initiation, promotion and progression. Experiments in cell cultures of varied types and isolated subcellular systems in vitro imply many mechanisms in the pharmacological activity of resveratrol. These mechanisms include modulation of the transcription factor NF-κB,[53] inhibition of the cytochrome P450 isoenzyme CYP1A1[54] (although this may not be relevant to the CYP1A1-mediated bioactivation of the procarcinogen benzo(a)pyrene),[55] alterations in androgenic[56] actions, and expression and activity of cyclooxygenase (COX) enzymes. In vitro, resveratrol "inhibited the proliferation of human pancreatic cancer cell lines." In some lineages of cancer cell culture, resveratrol has been shown to induce apoptosis, which means it kills cells and may kill cancer cells.[56][57][58][59][60][61] Resveratrol has been shown to induce Fas/Fas ligand mediated apoptosis, p53 and cyclins A, B1, and cyclin-dependent kinases cdk 1 and 2. Resveratrol also possesses antioxidant and anti-angiogenic properties.[62][63]
Resveratrol was reported to be effective against neuronal cell dysfunction and cell death, and, in theory, could be effective against diseases such as Huntington's disease and Alzheimer's disease.[64][65] Again, this has not yet been tested in humans for any disease.
Resveratrol has direct inhibitory action on cardiac fibroblasts, and may inhibit the progression of cardiac fibrosis.[66]
Resveratrol also significantly increases natural testosterone production from acting as both a selective estrogen receptor modulator[67] and an aromatase inhibitor.[68] Resveratrol has also been found to act as an agonist of the GPER (GPR30).[69]
Resveratrol increased intracellular glutathione levels via Nrf2-dependent upregulation of gamma-glutamylcysteine ligase in lung epithelial cells, which protected them against cigarette smoke extract-induced oxidative stress.[70]
Another potentially important mechanism common to both resveratrol supplementation and caloric restriction is the modulation of autophagy.[71] SIRT1 is a hypothesized target of both resveratrol and caloric restriction, and has been shown to facilitate autophagy through the inhibition of mTOR, which itself negatively regulates autophagy.[72]
In 2012, it was shown that resveratrol is capable of competitively inhibiting various phosphodiesterases, which results in an increase in cytosolic concentration of cAMP, which acts as a second messenger for the activation of the pathway Epac1/CaMKKβ/AMPK/SIRT1/PGC-1α. This rise of cAMP concentration allows an increase in oxidation of fatty acids, mitochondrial biogenesis, mitochondrial respiration, and gluconeogenesis.[73][74]
Chemical and physical properties
Resveratrol (3,5,4'-trihydroxystilbene) is a stilbenoid, a derivative of stilbene.
It exists as two geometric isomers: cis- (Z) and trans- (E), with the trans-isomer shown in the top image. The trans- and cis-resveratrol can be either free or bound to glucose.[75]
The trans- form can undergo isomerization to the cis- form when exposed to ultraviolet irradiation,[76] a process called photoisomerization:[77]
Recently, it is noted that ultraviolet irradiation to cis-resveratrol induces further photochemical reaction, produces a fluorescent molecule named "Resveratrone".[78]
Trans-resveratrol in the powder form was found to be stable under "accelerated stability" conditions of 75% humidity and 40 °C in the presence of air.[79] The trans isomer is also stabilized by the presence of transport proteins.[80] Resveratrol content also was stable in the skins of grapes and pomace taken after fermentation and stored for a long period.[81] lH- and 13C-NMR data for the four most common forms of resveratrols are reported in literature.[75]
Metabolism
Resveratrol gets extensively metabolized in the body. Liver and gut are the major site of its metabolism. Lungs are also involved in its metabolism, with inter-species difference in its pulmonary metabolism.[82]
Biosynthesis
Resveratrol is produced in plants by the action of the enzyme, resveratrol synthase.[83]
Biotransformation
The grapevine fungal pathogen Botrytis cinerea is able to oxidise resveratrol into metabolites showing attenuated antifungal activities. Those include the resveratrol dimers restrytisol A, B, and C, resveratrol trans-dehydrodimer, leachinol F, and pallidol.[84] The soil bacterium Bacillus cereus can be used to transform resveratrol into piceid (resveratrol 3-O-beta-D-glucoside).[85]
Occurrences
Plants
Resveratrol was originally isolated by Takaoka from the roots of hellebore in 1940, and later, in 1963, from the roots of Japanese knotweed. It attracted wider attention only in 1992, however, when its presence in wine was suggested as the explanation for cardioprotective effects of wine.[30]
In grapes, trans-resveratrol is a phytoalexin produced against the growth of fungal pathogens such as Botrytis cinerea.[86] Its presence in Vitis vinifera grapes can also be constitutive, with accumulation in ripe berries of different levels of bound and free resveratrols, according to the genotype.[87] In grapes, resveratrol is found primarily in the skin,[88] and, in muscadine grapes, also in the seeds.[89] The amount found in grape skins also varies with the grape cultivar, its geographic origin, and exposure to fungal infection. The amount of fermentation time a wine spends in contact with grape skins is an important determinant of its resveratrol content.[75][88]
It is also found in Pinus strobus, the eastern white pine.
Foods
The levels of resveratrol found in food varies greatly. Red wine contains between 0.2 and 5.8 mg/l,[90] depending on the grape variety, while white wine has much less, because red wine is fermented with the skins, allowing the wine to extract the resveratrol, whereas white wine is fermented after the skin has been removed.[88][91] The composition of wine is different from that of grapes since the extraction of resveratrols from grapes depends on the duration of the skin contact, and the resveratrol 3-glucosides are in part hydrolysed, yielding both trans- and cis-resveratrol.[75] A number of reports have indicated muscadine grapes may contain high concentrations of resveratrol, and that wines produced from these grapes, both red and white, may contain more than 40 mg/l,[89][92] however, subsequent studies have found little or no resveratrol in different varieties of muscadine grapes.[93][94]
One of the most promising sources is peanuts, especially sprouted peanuts where the content rivals that in grapes. Before sprouting, it was in the range of 2.3 to 4.5 μg/g, and after sprouting, in the range of 11.7 to 25.7 μg/g depending upon peanut cultivar.[95]
The fruit of the mulberry (esp. the skin)[96] is a source, and is sold as a nutritional supplement.
Cocoa powder, baking chocolate, and dark chocolate also have low levels of resveratrol in normal consumption quantities (0.35 to 1.85 mg/kg).[97]
Wine and grape juice
| Beverage | Total resveratrol (mg/l)[88][89] | Total resveratrol (mg/150 ml)[88][89] |
|---|---|---|
| Red wine (global) | 1.98 – 7.13 | 0.30 – 1.07 |
| Red wine (Spanish) | 1.92 – 12.59 | 0.29 – 1.89 |
| Red grape juice (Spanish) | 1.14 – 8.69 | 0.17 – 1.30 |
| Rose wine (Spanish) | 0.43 – 3.52 | 0.06 – 0.53 |
| Pinot noir | 0.40 – 2.0 | 0.06 – 0.30 |
| White wine (Spanish) | 0.05 – 1.80 | 0.01 – 0.27 |
The trans-resveratrol concentration in 40 Tuscan wines ranged from 0.3 to 2.1 mg/l in the 32 red wines tested and had a maximum of 0.1 mg/l in the 8 white wines in the test. Both the cis- and trans-isomers of resveratrol were detected in all tested samples. cis-resveratrol levels were comparable to those of the trans-isomer. They ranged from 0.5 mg/l to 1.9 mg/l in red wines and had a maximum of 0.2 mg/l in white wines.[98]
In a review of published resveratrol concentrations, the average in red wines is 1.9±1.7 mg trans-resveratrol/L (8.2±7.5 µM, ranging from nondetectable levels to 14.3 mg/l (62.7 μM) trans-resveratrol. Levels of cis-resveratrol follow the same trend as trans-resveratrol.[99]
Reports suggest some aspect of the wine making process converts piceid to resveratrol in wine, as wine seems to have twice the average resveratrol concentration of the equivalent commercial juices.[89]
In general, wines made from grapes of the Pinot Noir and St. Laurent varieties showed the highest level of trans-resveratrol, though no wine or region can yet be said to produce wines with significantly higher concentrations than any other wine or region.[99]
Selected foods
| Food | Serving | Total resveratrol (mg)[97][100] |
|---|---|---|
| Peanuts (raw) | 1 c (146 g) | 0.01 – 0.26 |
| Peanuts (boiled) | 1 c (180 g) | 0.32 – 1.28 |
| Peanut butter | 1 c (258 g) | 0.04 – 0.13 |
| Red grapes | 1 c (160 g) | 0.24 – 1.25 |
| Cocoa powder | 1 c (200 g) | 0.28 – 0.46 |
Ounce for ounce, peanuts have about half as much resveratrol as red wine. The average amount in peanuts in the marketplace is 79.4 µg/ounce.
In comparison, some red wines contain approximately 160 µg/fluid ounce.[101] Resveratrol was detected in grape, cranberry, and wine samples. Concentrations ranged from 1.56 to 1042 nmol/g in Concord grape products, and from 8.63 to 24.84 µmol/L in Italian red wine. The concentrations of resveratrol were similar in cranberry and grape juice at 1.07 and 1.56 nmol/g, respectively.[102]
Blueberries have about twice as much resveratrol as bilberries, but there is great regional variation. These fruits have less than 10% of the resveratrol of grapes. Cooking or heat processing of these berries will contribute to the degradation of resveratrol, reducing it by up to half.[103]
Supplementation
As a result of extensive news coverage,[104][105] sales of supplements greatly increased in 2006.[106] This was despite the existence of studies cautioning that benefits to humans are unproven.[106][107][108]
Supplements vary in purity and can contain anywhere from 50 percent to 99 percent resveratrol. Many brands consist of an unpurified extract of Japanese knotweed (Polygonum cuspidatum), an introduced species in many countries. These contain about 50 percent resveratrol by weight, as well as emodin, which, while considered safe in moderate quantities, can have a laxative effect in high amounts.[109] Resveratrol can be produced from its glucoside piceid from Japanese knotweed fermented by Aspergillus oryzae.[110]
Harvard University scientist and professor David Sinclair is often quoted in online ads for resveratrol supplements, many of which imply endorsement of the advertised product; however, Sinclair, who has studied resveratrol extensively, has gone on record in Bloomberg Businessweek to say he never uttered many of the statements attributed to him on these sites.[111]
Research
There are a number of promising animal studies and some data from human clinical trials is emerging.[112][113] Nevertheless, there is not enough evidence to recommend consumption of resveratrol beyond the amount that can be obtained through dietary sources, and more human clinical trials are needed.[114]
Cancer
As of 2014, the results of limited human clinical trials with small samples sizes of the effects of resveratrol on cancer are inconsistent. Testing of resveratrol in animal models of cancer have also shown mixed results.[9] The strongest evidence of anticancer action of resveratrol exists for tumors it can contact directly, such as skin and gastrointestinal tract tumors. For other cancers, the evidence is uncertain, even if massive doses of resveratrol are used.[115] Resveratrol treatment appeared to prevent the development of mammary tumors in animal models; however, it had no effect on the growth of existing tumors. Paradoxically, treatment of prepubertal mice with high doses of resveratrol enhanced formation of tumors. Injected in high doses into mice, resveratrol slowed the growth of neuroblastomas.[115]
Cardioprotective effects
Moderate drinking of red wine has long been known to reduce the risk of heart disease.[116] This is best known as "the French paradox".[117][118]
Studies suggest resveratrol in red wine may play an important role in this phenomenon.[119] It appears to stimulate endothelial nitric oxide synthase (eNOS) activity[120] and inhibit platelet aggregation.[121]
The cardioprotective effects of resveratrol also are theorized to be a form of preconditioning—the best method of cardioprotection, rather than direct therapy.[122] Study into the cardioprotective effects of resveratrol is based on the research of Dipak K. Das. However, he has been found guilty of scientific fraud, and many of his publications related to resveratrol have been retracted.[123][124]
Antidiabetic effects
Other diabetic animal model studies by different researchers have also demonstrated the antidiabetic effects of resveratrol.[35][125] This compound was shown to act as agonist of PPARgamma, nuclear receptor that is current pharmacological target for the treatment of diabetes type 2.[126]
Skin protection
The oxidative stress induced by ultraviolet radiation is one of the main causes for premature skin aging. The photoprotective effects of several polyphenols known for their antioxidant properties, including resveratrol, have been investigated in silico and in topical application conditions.[127][128]
Neuroprotective effects
The neuroprotective effects have been confirmed in several animal model studies.[129]
Sirtuin activation
Some of the benefits demonstrated in previous studies were overstated,[130][131] however, this study was challenged immediately,[132] and a few experiments were suggested to be of inferior quality.[133]
Psychological
In a number of animal models resveratrol has had an antidepressant-like effect.[134] Whether or not there is any effect in humans is unclear.[134]
Related compounds
- Dihydro-resveratrol
- Epsilon-viniferin, Pallidol and Quadrangularin A three different resveratrol dimers
- Trans-diptoindonesin B, a resveratrol trimer
- Hopeaphenol, a resveratrol tetramer
- Oxyresveratrol, the aglycone of mulberroside A, a compound found in Morus alba, the white mulberry[135]
- Piceatannol, an active metabolite of resveratrol found in red wine
- Piceid, a resveratrol glucoside
- Pterostilbene, a doubly methylated resveratrol
- 4'-Methoxy-(E)-resveratrol 3-O-rutinoside, a compound found in the stem bark of Boswellia dalzielii[136]
See also
References
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- 1 2 Resveratrol MSDS on Fisher Scientific website
- 1 2 3 Resveratrol MSDS on www.sigmaaldrich.com
- ↑ Bechmann LP, Zahn D, Gieseler RK, Fingas CD, Marquitan G, Jochum C, Gerken G, Friedman SL, Canbay A; Zahn; Gieseler; Fingas; Marquitan; Jochum; Gerken; Friedman; Canbay (June 2009). "Resveratrol amplifies profibrogenic effects of free fatty acids on human hepatic stellate cells". Hepatol. Res. 39 (6): 601–8. doi:10.1111/j.1872-034X.2008.00485.x. PMC 2893585. PMID 19207580.
- ↑ Fremont, Lucie (January 2000). "Biological Effects of Resveratrol". Life Sciences 66: 663–673. doi:10.1016/S0024-3205(99)00410-5. PMID 10680575. Retrieved 6 June 2014.
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- 1 2 Liu Y, Ma W, Zhang P, He S, Huang D; Ma; Zhang; He; Huang (March 2014). "Effect of resveratrol on blood pressure: A meta-analysis of randomized controlled trials". Clinical Nutrition 34 (1): 27–34. doi:10.1016/j.clnu.2014.03.009. PMID 24731650.
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- ↑ Poulsen MM, Jørgensen JO, Jessen N, Richelsen B, Pedersen SB; Jørgensen; Jessen; Richelsen; Pedersen (Jul 2013). "Resveratrol in metabolic health: an overview of the current evidence and perspectives". Annals of the New York Academy of Sciences 1290: 74–82. Bibcode:2013NYASA1290...74P. doi:10.1111/nyas.12141. PMID 23855468.
- 1 2 Hausenblas HA, Schoulda JA, Smoliga JM; Schoulda; Smoliga (19 August 2014). "Resveratrol treatment as an adjunct to pharmacological management in type 2 diabetes mellitus-systematic review and meta-analysis". Molecular nutrition & food research 59 (1): 147–59. doi:10.1002/mnfr.201400173. PMID 25138371.
- ↑ Fernández AF, Fraga MF; Fraga (Jul 2011). "The effects of the dietary polyphenol resveratrol on human healthy aging and lifespan". Epigenetics : official journal of the DNA Methylation Society 6 (7): 870–4. doi:10.4161/epi.6.7.16499. PMID 21613817.
- ↑ Resveratrol, a new phenolic compound, from Veratrum grandiflorum. M Takaoka, Journal of the Chemical Society of Japan, 1939, volume 60, pages 1090-1100 (abstract)
- ↑ Schröder, Joachim (March 6, 2010). "Discovery of resveratrol". Resveratrol.
- ↑ Asensi M, Medina I, Ortega A, Carretero J, Baño MC, Obrador E, Estrela JM; Medina; Ortega; Carretero; Baño; Obrador; Estrela (August 2002). "Inhibition of cancer growth by resveratrol is related to its low bioavailability". Free Radic. Biol. Med. 33 (3): 387–98. doi:10.1016/S0891-5849(02)00911-5. PMID 12126761.
- ↑ Madhav NV, Shakya AK, Shakya P, Singh K; Shakya; Shakya; Singh (November 2009). "Orotransmucosal drug delivery systems: a review". J Control Release 140 (1): 2–11. doi:10.1016/j.jconrel.2009.07.016. PMID 19665039.
- 1 2 Ansari KA, Vavia PR, Trotta F, Cavalli R; Vavia; Trotta; Cavalli (March 2011). "Cyclodextrin-based nanosponges for delivery of resveratrol: in vitro characterisation, stability, cytotoxicity and permeation study". AAPS PharmSciTech 12 (1): 279–86. doi:10.1208/s12249-011-9584-3. PMC 3066340. PMID 21240574.
- ↑ Shojaei AH (1998). "Buccal mucosa as a route for systemic drug delivery: a review". J Pharm Pharm Sci 1 (1): 15–30. PMID 10942969.
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Contrary to previous results, ellagic acid and not resveratrol was the major phenolic in muscadine grapes. The HPLC solvent system used coupled with fluorescence detection allowed separation of ellagic acid from resveratrol and detection of resveratrol." "[T]rans-resveratrol had the lowest concentrations of the detected phenolics, ranging from not detected in two varieties to 0.2 mg/ 100 g of FW (Tables 1 and 2). Our result for resveratrol differed from previous results [Ector et al., 1996] indicating high concentrations. These researchers apparently were not able to separate ellagic acid from resveratrol with UV detection alone.
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MSKE [muscadine grape skin extract] does not contain significant quantities of resveratrol and differs from MSEE. To determine whether MSKE contains significant levels of resveratrol and to compare the chemical content of MSKE (skin) with MSEE (seed), HPLC analyses were done. As depicted in Supplementary Fig. S1A and B, MSKE does not contain significant amounts of resveratrol (<1 ?g/g by limit of detection).
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- ↑ Retraction Watch
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- ↑ "'Longevity gene' may be dead end: study". The Raw Story. Agence France-Presse. September 12, 2011.
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External links
- Félicien Breton (2008). "Resveratrol and polyphenols in wines".
- CTD's Resveratrol page from the Comparative Toxicogenomics Database
- U.S. National Library of Medicine: Drug Information Portal – Resveratrol
- Detailed Micro-Nutrient information on Resveratrol from the Linus Pauling Institute
- Resveratrol: Don't Buy the Hype
- Stay young on red wine drugs? Think again
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