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第 6 期                       王藤 等:普洱熟茶后发酵酚类物质变化研究进展                                         45

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                               Progress on changes in phenolic compounds during

                                       post⁃fermentation of ripened Puer tea



                                          1,2
                                                                     1,2
                                                                                1
                                                          1,2
                              WANG Teng ,CHEN Qiuyue ,SHA Gen ,MA Yan ,ZHAO Ming            1,2
                                1.College of Agriculture and Biotechnology & College of Tea Science,
                                    Yunnan Agricultural University, Kunming 650201, China;
                2.National & Local Joint Engineering Research Center on Germplasm lnnovation & Utilization of Chinese
                 Medicinal Materials in Southwestern China, Yunnan Agricultural University, Kunming 650201, China



                   Abstract  The unique quality and health benefits of ripened Puer tea stem from its microbial post -fer⁃
               mentation  process.  Phenolic  compounds  undergo  significant  transformation  during  this  process  to  form  the
               material  basis  for  their  flavor  and  functional  characteristics.  This  article  reviews  the  changes  in  phenolic
               compounds including catechins degraded by microbial extracellular enzymes and converted into gallic acid,
               theaflavins, and novel biologically active derivatives such as Puer catechins, carboxymethylated catechins,
               and Teadenol A through the oxidation, polymerization, cleavage, and other reactions during the fermenta⁃
               tion  process  of  ripened  Puer  tea  to  study  the  changes  in  phenolic  compounds  during  the  fermentation  pro⁃
               cess of ripened Puer tea and analyze the mechanism of quality formation. The total amount of flavonoids re⁃
               mains stable, and the hydrolysis of glycoside in flavonoids releases quercetin and other aglycones. The com⁃
               position of phenolic acids changes significantly, with an increase in the content of gallic acid and tannic acid
               further being metabolized into aroma-contributing compounds like methoxybenzenes. Furthermore, theafla⁃
               vins and thearubigins formed during fermentation are subsequently converted into theabrownins via enzymat⁃
               ic  polymerization  and  complexation  with  non-phenolic  components  such  as  polysaccharides  and  proteins.
               These transformations underpin the characteristic reddish-brown infusion color, mellow taste, and distinc⁃
               tively aged flavor of ripened Puer tea and are closely associated with its health benefits including the regula⁃
               tion  of  gut  microbiota,  antioxidant  activity,  and  metabolic  modulation.  Studies  in  the  future  should  inte⁃
               grate multi-omics to deeply analyze the interactions between microorganisms and phenolic metabolism, ac⁃
               curately identify the structure-activity relationships of key bioactive derivatives to comprehensively elucidate
               the quality formation and functional characteristics of ripened Puer tea.
                   Keywords  ripened Puer tea; post-fermentation; phenolic compounds; microbial metabolism; quali⁃
               ty formation
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