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1.
Foods ; 9(9)2020 Sep 02.
Artigo em Inglês | MEDLINE | ID: mdl-32887356

RESUMO

For the functional food applications, antioxidant properties and the bioactive compounds of the 23 Curcuma species commercially cultivated in Thailand were studied. Total phenolic content and DPPH radical scavenging activity were determined. The concentrations of eight bioactive compounds, including curcumin (1), demethoxycurcumin (2), bisdemethoxycurcumin (3), 1,7-diphenyl-(4E,6E)-4,6-heptadien-3-ol (4), germacrone (5), furanodienone (6), zederone (7), and ar-turmerone (8), were determined from the Curcuma by HPLC. While the total phenolic content of C. longa was highest (22.3 ± 2.4 mg GAE/g, mg of gallic acid equivalents), C. Wan Na-Natong exhibited the highest DPPH (2,2-diphenyl-1-picryl-hydrazyl-hydrate) radical scavenging activity. Twenty-three Curcuma species showed characteristic distributions of the bioactive compounds, which can be utilized for the identification and authentication of the cultivated Curcuma species. C. longa contained the highest content of curcumin (1) (304.9 ± 0.1 mg/g) and C. angustifolia contained the highest content of germacrone (5) (373.9 ± 1.1 mg/g). It was noteworthy that 1,7-diphenyl-(4E,6E)-4,6-heptadien-3-ol (4) was found only from C. comosa at a very high concentration (300.7 ± 1.4 mg/g). It was concluded that Thai Curcuma species have a great potential for the application of functional foods and ingredients.

2.
Nutr Cancer ; 70(6): 984-996, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-30273054

RESUMO

Kaempferia parviflora (KP) is a famous medicinal plant from Thailand, and is a rich source of various kinds of methoxyflavones (MFs). Many kinds of food products such as tea, capsule, and liquor are manufactured from the rhizomes of KP. In this study, KP infusions were prepared with different brewing conditions, and the amounts of three major methoxylflavones, 5,7-dimethoxyflavone (DMF), 5,7,4'-trimethoxyflavone (TMF), and 3,5,7,3',4'-pentamethoxyflavone (PMF), were analyzed. The antiproliferative activities of DMF, TMF, and PMF isolated from the brewed tea samples were evaluated. TMF was discovered to be significantly effective at inhibiting proliferation of SNU-16 human gastric cancer cells in a concentration dependent manner. TMF induced apoptosis, as evidenced by increments of sub-G1 phase, DNA fragmentation, annexin-V/PI staining, the Bax/Bcl-xL ratio, proteolytic activation of caspase-3,-7,-8, and degradation of poly (ADP-ribose) polymerase (PARP) protein. Furthermore, it was found that TMF induced apoptosis via ER stress, verified by an increase in the level of C/EBP homologous protein (CHOP), glucose regulated protein 78 (GRP78), inositol-requiring enzyme 1 α (IRE1α), activating transcription factor-4 (ATF-4), and the splice isoform of X-box-binding protein-1 (XBP-1) mRNA.


Assuntos
Apoptose/efeitos dos fármacos , Estresse do Retículo Endoplasmático/efeitos dos fármacos , Flavonas/farmacologia , Neoplasias Gástricas/tratamento farmacológico , Zingiberaceae/química , Fator 4 Ativador da Transcrição/análise , Linhagem Celular Tumoral , Estresse do Retículo Endoplasmático/fisiologia , Flavonas/análise , Flavonas/isolamento & purificação , Glicogênio Sintase Quinase 3 beta/análise , Humanos , Proteínas Proto-Oncogênicas c-akt/fisiologia , Neoplasias Gástricas/patologia , Serina-Treonina Quinases TOR/análise , Fator de Transcrição CHOP/análise , Proteína 1 de Ligação a X-Box/genética , Proteína bcl-X/análise
3.
J Agric Food Chem ; 65(16): 3305-3310, 2017 Apr 26.
Artigo em Inglês | MEDLINE | ID: mdl-28401758

RESUMO

Curcumin and other curcuminoids from Curcuma longa are important bioactive compounds exhibiting various pharmacological activities. In addition to the known reductive metabolism of curcuminoids, an alternative biotransformation of curcuminoids by human gut microbiota is reported herein. A curcuminoid mixture, composed of curcumin (1), demethoxycurcumin (2), and bisdemethoxycurcumin (3), was metabolized by the human intestinal bacterium Blautia sp. MRG-PMF1. 1 and 2 were converted to new metabolites by the methyl aryl ether cleavage reaction. Two metabolites, demethylcurcumin (4) and bisdemethylcurcumin (5), were sequentially produced from 1, and demethyldemethoxycurcumin (6) was produced from 2. Until now, sequential reduction of the heptadienone backbone of curcuminoids was the only known metabolism to occur in the human intestine. In this study, a new intestinal metabolism of curcuminoids was discovered. Demethylation of curcuminoids produced three new colonic metabolites that were already known as promising synthetic curcumin analogues. The results could explain the observed beneficial effects of turmeric.


Assuntos
Bactérias/metabolismo , Curcuma/metabolismo , Curcumina/metabolismo , Microbioma Gastrointestinal , Mucosa Intestinal/metabolismo , Intestinos/microbiologia , Extratos Vegetais/metabolismo , Bactérias/classificação , Bactérias/isolamento & purificação , Curcumina/análogos & derivados , Curcumina/química , Diarileptanoides , Humanos , Metilação , Estrutura Molecular , Extratos Vegetais/química
4.
J Agric Food Chem ; 65(8): 1620-1629, 2017 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-28211698

RESUMO

Polymethoxyflavones (PMFs) were biotransformed to various demethylated metabolites in the human intestine by the PMF-metabolizing bacterium, Blautia sp. MRG-PMF1. Because the newly formed metabolites can have different biological activities, the pathways and regioselectivity of PMF bioconversion were investigated. Using an anaerobic in vitro study, 12 PMFs, 5,7-dimethoxyflavone (5,7-DMF), 5-hydroxy-7-methoxyflavone (5-OH-7-MF), 3,5,7-trimethoxyflavone (3,5,7-TMF), 5-hydroxy-3,7-dimethoxyflavone (5-OH-3,7-DMF), 5,7,4'-trimethoxyflavone (5,7,4'-TMF), 5-hydroxy-7,4'-dimethoxyflavone (5-OH-7,4'-DMF), 3,5,7,4'-tetramethoxyflavone (3,5,7,4'-TMF), 5-hydroxy-3,7,4'-trimethoxyflavone (5-OH-3,7,4'-TMF), 5,7,3',4'-tetramethoxyflavone (5,7,3',4'-TMF), 3,5,7,3',4'-pentamethoxyflavone (3,5,7,3',4'-PMF), 5-hydroxy-3,7,3',4'-tetramethoxyflavone (5-OH-3,7,3',4'-TMF), and 5,3'-dihydroxy-3,7,4'-trimethoxyflavone (5,3'-diOH-3,7,4'-TMF), were converted to chrysin, apigenin, galangin, kaempferol, luteolin, and quercetin after complete demethylation. The time-course monitoring of PMF biotransformations elucidated bioconversion pathways, including the identification of metabolic intermediates. As a robust flavonoid demethylase, regioselectivity of PMF demethylation generally followed the order C-7 > C-4' ≈ C-3' > C-5 > C-3. PMF demethylase in the MRG-PMF1 strain was suggested as a Co-corrinoid methyltransferase system, and this was supported by the experiments utilizing other methyl aryl ether substrates and inhibitors.


Assuntos
Firmicutes/metabolismo , Flavonoides/metabolismo , Microbioma Gastrointestinal , Intestinos/microbiologia , Biotransformação , Firmicutes/isolamento & purificação , Flavonoides/química , Humanos , Metilação
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