Table 2.

Determination of hydrogen peroxide found in coffee drinks by chemiluminescence detection-high performance liquid chromatography (CL-HPLC)

Coffee drink	H2O2 found (µM)
Normal	67.1 ± 3.8
Caffeine-free	64.7 ± 2.1
Espresso	99.7 ± 9.7
Drip	165.0 ± 5.3

Data represent means ± standard errors (n = 4). Normal, caffeine-free, and espresso coffee drinks were prepared by dissolving 2.0 g of powdered instant coffee in 140 mL of boiled water. Drip coffee was prepared by pouring 150 mL of boiling water onto 15.0 g of freshly milled coffee beans on a filter paper.

Adapted with permission from Ref. 51. Copyright 1994 Elsevier.