Impact of prolonged withering on phenolic compounds and antioxidant capability in white tea using LC-MS-based metabolomics and HPLC analysis: Comparison with green tea was written by Zhou, Binxing;Wang, Zihao;Yin, Peng;Ma, Bingsong;Ma, Cunqiang;Xu, Chengcheng;Wang, Jiacai;Wang, Ziyu;Yin, Dingfang;Xia, Tao. And the article was included in Food Chemistry in 2022.Formula: C30H26O12 The following contents are mentioned in the article:
Contents of 20 bioactive compounds in 12 teas produced in Xinyang Region were determined by high performance liquid chromatog. Ultra-high performance liquid chromatog.-quadrupole time of flight-mass spectrometry was developed for untargeted metabolomics anal. Antioxidant activities were measured by 4 various assays. Those teas could be completely divided into green and white tea through principal component anal., hierarchical cluster anal. and orthonormal partial least squares-discriminant anal. (R2Y = 0.996 and Q2 = 0.982, resp.). The prolonged withering generated 472 differentiated metabolites between white and green tea, prompted significant decreases (variable importance in the projection > 1.0, p-value < 0.05 and fold change > 1.50) of most catechins and 8 phenolic acids to form 4 theaflavins, and benefited for the accumulation of 17 flavonoids and flavonoid glycosides, 8 flavanone and their derivatives, 20 free amino acids, 12 sugars and 1 purine alkaloid. Addnl., kaempferol and taxifolin contributed to 1,1-diphenyl-2-picrylhydrazyl (DPPH) scavenging ability of white tea. This study involved multiple reactions and reactants, such as (2R,2’R,3R,3’R,4R)-2,2′-Bis(3,4-dihydroxyphenyl)-[4,8′-bichromane]-3,3′,5,5′,7,7′-hexaol (cas: 29106-49-8Formula: C30H26O12).
(2R,2’R,3R,3’R,4R)-2,2′-Bis(3,4-dihydroxyphenyl)-[4,8′-bichromane]-3,3′,5,5′,7,7′-hexaol (cas: 29106-49-8) belongs to alcohols. A strong base can deprotonate an alcohol to yield an alkoxide ion (R―O−). For example, sodamide (NaNH2), a very strong base, abstracts the hydrogen atom of an alcohol. Grignard and organolithium reagents are powerful tools for organic synthesis, and the most common products of their reactions are alcohols.Formula: C30H26O12
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