Filtration
Dragon fruit pulp was treated as discussed by Nur ‘Aliaa et al.
(2009). The treated pulp was centrifuged (Hettich Zentrifugen
Universal 320R, Germany) at 3000g for 10 min, and the
supernatant was collected. The juice was then filtered through
a filter paper (CHMLAB GROUP, Barcelona, Spain) with a
pore size of 11 μm using a Buchner funnel attached to an oil-
less vacuum pump (Rocker 300, Rocker Scientific Company
Limited, Taiwan).