Study on the Difference of Phenolic Compounds in Wine Grape"Cabernet Sauvignon"
Using the fruits of four different mature strains of the Eurasian red wine grape "Cabernet Sauvignon" (transgenic line E19 days in advance, transgenic line E27 days in advance, transgenic line E35 days in advance, and normal transgenic line CK) as materials,the UPLC method was used to determine the content of 22 monomeric phenols such as epigallocatechin gallate, syringic acid and naringin in fruits, and to explore the differences of monomer phenol accumulation in grape fruits among different mature strains.The results showed that compared with normal mature lines ( CK) , the contents of total tannins and total anthocyanins in mature lines ( E3) changed 5 days earlier were the highest, which were 1.20 and 3.27 mg/g, respectively. The content of 2, 5-dihydroxybenzoic acid in 9 phenolic acids was the highest in the three early maturing lines, and accounted for more than 40％ in E2 and E3. The content of epigallocatechin gallate among the six flavanols was the highest in the three early maturity strains( E1,E2,E3) , accounting for 46％, 57％ and 67％ of the total flavanols, respectively. The content of myrice-tin in the seven flavonols was the highest in the early maturing (E1,E2,E3) and normal mature strains (CK), accounting for 87％, 93％, 92％ and 89％ of the total flavonols, respectively. As the ripening time continued to delay, the three phenolic substances all showed a trend of increasing first and then decreasing. In the early maturing strains, the flavonols content was higher than that of phenolic acids and flavanols, and the accumulation of flavanols in"Cabernet Sauvignon"grapes was low.
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