The process used for production of grape juice presented high
yield without the pressing the fruit. The temperature of 60 C with
addition of pectinase resulted in an increase on the yield and
decrease of turbidity. The use of enzyme decreased the concentration
of catechins and increased the content of procyanidin B1 and
B2. The temperature of maceration of 60 C contributed to the
higher extraction of phenolic compounds, mainly anthocyanins.
The combination of temperature 60 C with the use of enzymatic
poll resulted in higher extraction of all analyzed phenolic compounds,
increase of almost all organic acids and decrease of acetic
acid content. The antioxidant activity was high and can be related
to the contents of anthocyanins, total phenolics, catechins, caffeic
acid, cinnamic acid and gallic acid. Among the quantified bioactive
compounds, the caffeic acid, procyanidin B1 and trans-resveratrol
presented higher contents compared to juices of other regions.
The analysis of principal components was efficient to show the
effect of maceration treatments, giving evidence of positive effect
of temperature and pectinases addition on the extraction of desirable
grape compounds. A high quality juice was obtained in industrial
scale, contributing to the process development taking into
account the bioactive properties of the product.
A
The process used for production of grape juice presented highyield without the pressing the fruit. The temperature of 60 C withaddition of pectinase resulted in an increase on the yield anddecrease of turbidity. The use of enzyme decreased the concentrationof catechins and increased the content of procyanidin B1 andB2. The temperature of maceration of 60 C contributed to thehigher extraction of phenolic compounds, mainly anthocyanins.The combination of temperature 60 C with the use of enzymaticpoll resulted in higher extraction of all analyzed phenolic compounds,increase of almost all organic acids and decrease of aceticacid content. The antioxidant activity was high and can be relatedto the contents of anthocyanins, total phenolics, catechins, caffeicacid, cinnamic acid and gallic acid. Among the quantified bioactivecompounds, the caffeic acid, procyanidin B1 and trans-resveratrolpresented higher contents compared to juices of other regions.The analysis of principal components was efficient to show theeffect of maceration treatments, giving evidence of positive effectof temperature and pectinases addition on the extraction of desirablegrape compounds. A high quality juice was obtained in industrialscale, contributing to the process development taking intoaccount the bioactive properties of the product.A
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