| In vitro: |
| Molecules. 2011 Dec 7;16(12):10157-67. | | Antioxidant phenolic compounds of cassava (Manihot esculenta) from Hainan.[Pubmed: 22157579] |
METHODS AND RESULTS:
An activity-directed fractionation and purification process was used to isolate antioxidant components from cassava stems produced in Hainan. The ethyl acetate and n-butanol fractions showed greater DPPH˙and ABTS·+ scavenging activities than other fractions. The ethyl acetate fraction was subjected to column chromatography, to yield ten phenolic compounds: Coniferaldehyde (1), isovanillin (2), 6-deoxyjacareubin (3), scopoletin (4), syringaldehyde (5), pinoresinol (6), p-coumaric acid (7), ficusol (8), balanophonin (9) and ethamivan (10), which possess significant antioxidant activities. The relative order of DPPH· scavenging capacity for these compounds was ascorbic acid (reference) > 6 > 1 > 8 > 10 > 9 > 3 > 4 > 7 > 5 > 2, and that of ABTS·+ scavenging capacity was 5 > 7 > 1 > 10 > 4 > 6 > 8 > 2 > Trolox (reference compound) > 3 > 9.
CONCLUSIONS:
The results showed that these phenolic compounds contributed to the antioxidant activity of cassava. | | Molecules. 2010 Jun 1;15(6):4011-6. | | Aquilarin A, a new benzenoid derivative from the fresh stem of Aquilaria sinensis.[Pubmed: 20657422 ] |
METHODS AND RESULTS:
Chemical investigation of the EtOH extract of the fresh stem of Aquilaria sinensis collected in Hainan Province of China resulted in the isolation of a new benzenoid, named aquilarin A (1), together with two known compounds balanophonin (2) and (+)-lariciresinol (3). Their structures were elucidated by a study of their physical and spectral data. Compounds 2 and 3 exhibited cytotoxicity against SGC-7901 and SMMC-7721 cell lines. | | J. Korean Soc. Appl.Biol.Chem., 2008, 51(4):316- 20. | | Constituents of the seeds of Cornus officinalis with Inhibitory Activity on the Formation of Advanced Glycation End Products (AGEs)[Reference: WebLink] | Ten compounds, (+)-pinoresinol (1), (-)-Balanophonin (2), gallicin (3), vanillin (4), 4-hydroxybenzaldehyde (5), coniferaldehyde (6), betulinic acid (7), ursolic acid (8), 5-hydroxymethyl furfural (9), and malic acid (10), were isolated from a EtOAc-soluble fraction of the seeds of Cornus officinalis.
METHODS AND RESULTS:
The structures of these compounds were elucidated by spectroscopic methods as well as by comparison with reported values. Compounds 1, 2, and 4-7 were isolated from this species for the first time. All the isolates (1-10) were subjected to an in vitro bioassay to evaluate their inhibitory activity against advanced glycation end products (AGEs) formation. Among these, compounds 2 and 3 showed the significant inhibitory activity on AGEs formation with values of 27.81 and 18.04, respectively. | | Natural Product Sciences, 2011, 17(4):267-72. | | Bioactive Phenolic constituents from the culms of Phyllostachys bambusoides[Reference: WebLink] |
METHODS AND RESULTS:
Fractionation process of n-hexane and CHCl 3 extracts afforded four phenolic constituents, ferulic acid (1), vanillin (2), coniferaldehyde (3), and coniferyl alcohol (4) as guided by their DPPH free radical scavenging activities. Additionally, activity-guided fractionation of EtOAc extract with anti-cariogenic activity has resulted in the isolation of coniferaldehyde (3), 2,6-dimethoxy-p-benzoquinone (5), p-methoxycinnamic acid (6), (±)-Balanophonin (7), and 6-methoxychromanone (8). The structures of 1 - 8 were determined by spectroscopic data interpretation, and also by comparison of their data with the published values. Phenolic compounds 1 - 4 exhibited similar DPPH radical scavenging activities compared with the synthetic antioxidant, butylated hydroxytoluene (BHT), and compounds 3 and 5 - 8 showed significant antibacterial activity against cariogenic oral streptococci, Streptococcus mutans and S. sobrinus. |
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