Ascorbic acid content of 0%, 1.25% and 2.5% (w/v) Stevia rebaudiana (SR) beverage during in vitro gastrointestinal digestion, expressed as percentage. 1: Non-digested
sample, 2: salivary digesta, 3: gastric digesta, 4: non-dialysed intestinal fraction, 5: dialysed intestinal fraction.