茶和茶制品檢測(cè)

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DIN 10811-1-2000茶和茶制品的分析.液體茶飲料中可可堿和咖啡因含量測(cè)定.第1部分:HPLC常規(guī)方法

The document specifies a method using high-performance liquid chromatography (HPLC) for the determination of theobromine and coffeine content of fluid tea drinks. The method is usable for tea drinks with a theobromine content higher than 2 mg/l.

DIN 10811-2-1997茶和茶制品分析.茶飲料中可可堿和咖啡因含量測(cè)定.第2部分:液體色譜分析比照法(亦適用于低含量可可因)

The document specifies a HPLC-method for the determination of theobromine and caffeine contents of fluid tea drinks. This method should be prefered for the determination of theobromine contents lower than 2 mg/l. For the determination of theobromine contents higher than 2 mg/l part 1 of DIN 10811 should be prefered.