and black tea were performed according to Green, Murphy, Schulz,
Watkins, and Ferruzzi (2007) with a slight modification as follow:
4 mL of tea solution diluted with 2 mL saline (0.9%) was mixed
with 0.6 mL gastric liquid (40 mg mL1 porcine pepsin in 0.1 M
HCl) in an amber vial.