Tshuaj yej polyphenols yog cov ntsiab lus dav dav rau cov tshuaj polyphenolic hauv tshuaj yej nplooj, uas yog cov hmoov dawb amorphous uas yooj yim soluble hauv dej, soluble hauv ethanol, methanol, acetone, thiab ethyl acetate, thiab insoluble hauv chloroform. Cov ntsiab lus ntawm cov tshuaj yej polyphenols hauv cov tshuaj yej ntsuab yog qhov siab, suav txog 15% mus rau 30% ntawm nws qhov loj. Lub ntsiab Cheebtsam ntawm tshuaj yej polyphenols yog flavonoids, anthocyanins, flavonols, anthocyanins, phenolic acids, thiab phenolic acids. Ntawm lawv, flavanones (feem ntau yog catechins) yog qhov tseem ceeb tshaj plaws, suav txog 60% mus rau 80% ntawm tag nrho cov tshuaj yej polyphenols, tom qab ntawd los ntawm flavonoids, thiab lwm yam phenolic tshuaj muaj cov ntsiab lus tsawg.