Cov khoom

Kev noj cov tshuaj polyphenols feem ntau tau cuam tshuam nrog qis qis ntawm cov kab mob degenerative.Feem ntau ntawm cov natural antioxidants yog los ntawm txiv hmab txiv ntoo, zaub, txuj lom, nplej thiab tshuaj ntsuab.Vim li no, muaj kev txaus siab ntxiv rau kev txheeb xyuas cov nroj tsuag extract tebchaw.Polymeric tannins thiab monomeric flavonoids, xws li catechin thiab epicatechin, nyob rau hauv ntoo thuv bark thiab ntsuab tshuaj yej extracts yuav ua tau lub luag hauj lwm rau cov antioxidant ntau dua ntawm cov extracts.Lub hom phiaj ntawm txoj kev tshawb fawb tam sim no yog txhawm rau txheeb xyuas cov phenolic tebchaw hauv cov ntoo thuv ntoo thiab cov tshuaj yej ntsuab concentrated extracts siv cov kua chromatography ua ke nrog electrospray ionization pawg spectrometry (HPLC-ESI-QTOF-MS).Tag nrho ntawm 37 thiab 35 cov tebchaw los ntawm cov ntoo thuv tawv ntoo thiab cov tshuaj yej ntsuab rho tawm, raws li, tau txheeb xyuas tias muaj nyob rau ntau yam kev kawm, feem ntau yog flavan-3-ol thiab nws cov derivatives (xws li procyanidins).Lub peev xwm antioxidant ntawm ob qho tib si rho tawm tau raug soj ntsuam los ntawm peb txoj hauv kev ua haujlwm antioxidant: Trolox equivalent antioxidant muaj peev xwm (TEAC), ferric txo antioxidant zog (FRAP) thiab oxygen radical absorbance peev (ORAC).Kev ua haujlwm antioxidant ntau dua los ntawm txhua txoj kev tau txais.Tsis tas li ntawd, tag nrho cov ntsiab lus ntawm polyphenol thiab flavan-3-ol, uas tau txiav txim los ntawm Folin-Ciocalteu thiab vanillin assays, raws li, tau nthuav tawm ntau dua ntawm gallic acid thiab (+)-catechin sib npaug.