Changes of pH values in fruit juices and yoghurt plus probiotics
entrapped with plant extracts during storage were also determined.
The initial pHs of mulberry, maoberry, longan and
melon juices were 3.15–3.17, 3.40–3.41, 7.09–7.12 and 6.80–6.82,
respectively. Addition of immobilized probiotic cultures had no
effect on pH values of the juices. At day 30, the decreases of pH of
all the juices were observed. However, the reduction rates of pH in
longan and melon juices were higher than that mulberry and
maoberry juices (data not shown)