| dc.description.abstract | The aim of this study was to evaluate the effects of commercial enzymes,
namely Pectinex Ultra SP-L and Viscozyme L on yield and quality of pomegranate
fruit juice, and the effects of carrier agent concentrations on yield and quality of
pomegranate powder. The two enzymes were applied in constant total rate 0.1%
(v/w), but at different combination ratios, at temperatures from 30 to 50oC in
fixed time (120 min) and pH (4.5). The pomegranate juice extracted with
optimized enzyme concentration and temperature was subjected to spray-drying
with using different carrier agent (mixture of 70% maltodextrin DE 12 and 30%
Gum Arabic) ratios. The combination of two enzymes showed significant effect to
the yield and quality of the juice, in contrast to single enzyme treatment or noenzyme treatment. The optimum conditions of enzymatic pretreatment was
identified as 0.1% (v/w) enzyme concentration in 50:50 combination of Pectinex
Ultra SP-L and Viscozyme L, incubation temperature at 40oC. Under the optimum
conditions, the extraction yield of the juice was as high as 89.24%, the TPC in
the juice 1450.91 mgGAE/100g (d.m.), TAC 16.72 mg/100g (d.m.), and
reducing sugar 350.33 mg/100g (d.m.) while total acidity (TA) in the juice
reached 0.41 g/100ml. In addition increasing carrier agent concentration
significantly affected the moisture content, hygroscopicity and bulk density of the
spray-dried pomegranate powder. The TPC and TAC was decrease during spraydrying process.
Keywords:
carrier agent, enzyme, Pectinex, Pomegranate juice, spray drying, Viscozyme | en_US |
