Abstract
The main aim of this study is the substitution of sugar with date concentrate in the fruit juice and blend fruit juice, for this purpose date concentrate was used as a sugar substitute in the blend of peach and apple juice. The effect of five factors including; sugar syrup (%w/w), date concentrate (%w/w), apple concentrate (%w/w), peach puree (%w/w) and storage time (day) on the physicochemical/color properties of juice samples were investigated. An experimental design based on a D-Optimal Combine Design (DOCD) was used to study the different factors affecting (in 5 levels) on the physicochemical/color properties of provided mixed fruit juices. Different quality indices, including acidity, vitamin C content, total phenolic content, antioxidant capacity, None Enzymatic Browning Index (NEBI), Hydroxyl Methyl Furfural (HMF), turbidity, color index and formalin index were measured and modeled. The obtained responses were analyzed and studied by Design-Expert software. Results showed that 1- The sugar in fruit juice blend can be easily replaced by date concentrate, 2- The blend fruit juice contains date concentrate has more HMF, vitamin C and NEBI indices than blend fruit juice contains sugar that is so important for human health, 3- Storage time don't have a significant effect on the turbidity, color parameters (L∗, a∗ and b∗) and antioxidant properties of fruit juices.
Highlights
Consumption of fresh fruit is often replaced by the intake of fruit juices, due to their convenience and ability to quench thirst
Results show that vitamin C content of blend juice samples is decreased by increasing storage time and increasing of date concentrate in the juice samples can increase vitamin C content that has a beneficial effect on the human health
Esteve et al (2005) research showed that the vitamin C concentration in orange juice was decreased by increasing storage time that their results is according to the our results
Summary
Consumption of fresh fruit is often replaced by the intake of fruit juices, due to their convenience and ability to quench thirst. Peaches include one of the most favorable fruits thanks to the delicious taste and the richness of nutrients. Peaches are rich in antioxidant, minerals and fiber (Sentanin and Rodriguez-Amaya, 2007; Toralles et al, 2006). That is why many people love to consume the fruits either at fresh or make it to be juices. Consuming peaches every day can increase your teeth and bones healthy since it is rich of minerals like fluoride and iron. The high amount of vitamin C has a big role to enhance your skin healthy as well (Sentanin and Rodriguez-Amaya, 2007; Toralles et al, 2006).
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