Therefore,
the objective of this study was to evaluate the effect
of thermal treatment on the nutritional quantity of gac
juice by determining the total phenolics content, total
flavonoids content, lycopene contents, beta-carotene
contents and antioxidant activity of fresh gac juice and
thermal-treated gac juice prepared from its aril part.
Materials and Methods
Gac juice preparation and thermal treatment
Fresh gac fruits were purchased from a local market
in Nakornpathom Province, Thailand. The red aril was
scooped out from the half cut gac fruit. Then the seeds
were removed from aril part. Gac paste was homogenized
and diluted into 20% v/v by distilled water in order to
get the concentration of gac juice sold in the market.
Five different thermal treatments were conducted:
cooked at 60ºC for 2 min, 70ºC for 2 min, 80ºC for 2 min,
90ºC for 2 min and 100ºC for 2 min. Unboiled gac juice
was used as control. All samples were filtered and kept
at -20ºC for further analyses