白茶儿茶素图谱：EGCG含量与六大茶类对比
White Tea Catechin Profile: EGCG Content vs All Six Tea Categories
儿茶素是茶叶中最主要的生物活性物质，白茶因'不炒不揉'的工艺最大限度保留了儿茶素。白毫银针EGCG含量约50-80mg/g干茶，高于绿茶（40-65mg/g）、乌龙茶（20-40mg/g）、红茶（5-15mg/g）。关键区别在于儿茶素组成比例：白茶以EGCG为主（占儿茶素总量50-65%），其次为ECG和EC。研究显示白茶EGCG的生物利用度高于其他茶类，因为缺少高温炒制过程中的热降解。这是白茶抗氧化功效强于其他茶类的科学基础。
Catechins are tea's primary bioactive compounds. White tea's 'no-kill, no-roll' process maximally preserves them. Silver Needle EGCG content: ~50-80mg/g dry weight, exceeding green tea (40-65), oolong (20-40), and black tea (5-15). Key difference lies in catechin composition: white tea is dominated by EGCG (50-65% of total catechins), followed by ECG and EC. Research shows white tea EGCG has higher bioavailability than other teas due to absence of thermal degradation from high-heat processing. This is the scientific basis for white tea's superior antioxidant properties.
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