Table 2.
Sample | No of samples | Catechin equivalent concentration (mmol/l)
|
||
---|---|---|---|---|
Mean | SE | 95% CI | ||
Shaken martini | 8 | 0.056 | 0.005 | 0.044 to 0.068 |
Stirred martini | 9 | 0.060 | 0.009 | 0.039 to 0.081 |
Sauvignon white wine | 9 | 0.592 | 0.030 | 0.523 to 0.661 |
Scotch whisky | 9 | 0.575 | 0.025 | 0.517 to 0.633 |
Assay performed by adding 20 μl sample to 980 μl Folin reagent diluted 1/10 with distilled water; colour allowed to develop for 0.5-2.5 hours the absorbance of the solution at 750 nm was read. Samples were compared with a standard curve prepared by adding 10-50 μl of 1 mmol/l catechin solution to Folin reagent. Standard curves measured on three days had R2 values of 0.9984-0.9999.