Study on correlation between contituents and liquor color of a distinctive green tea.

The Qingxin-1 green tea is a distinctively green tea,which has a very bright green liquor color and can endure repeated infusions.The relationship between contituents and liquor color of Qingxin-1 green tea was studied and at the same time,three kinds of green teas including Fudingdabai,Cuiyu and Jinxuan were taken as controls.The results indicated that the brightly green infusion color of Qingxin-1 green tea was lasting and the green tea could endure repeated infusions.The contents of chlorophyll a,chlorophyll b and chlorophylls in Qingxin-1 were significantly higher than those of the controls.The contents of flavonoids and tea polyphenols were obviously different among different kinds of green tea,but there was no significant difference.The contents of chlorophylls and flavonoids were correlated positively with liquor color of green teas.In this paper,these results suggested that the chlorophylls,flavonoids and polyphenols were important for liquor color.The fresh leaves and green teas had higher amounts of chlorophylls and flavonoids,and the liquor color was more brightly green,and as the contents of flavonoids increased,the yellowness and brightness of liquor color increased.The fresh leaves and green teas had higher amounts of polyphenols,and the liquor color was more instable.