Process And Antioxidant Activity Of Fruit Vinegar Prepared From Whole Passion Fruit

Passion fruit is a high-quality raw material for functional health food,which is juicy,unique flavor and rich nutrition,contains various health care functional components.passion fruit as raw material processed into a new generation vinegar with seasoning,nutrition,health care function,which not only solved the waste of resources because of discard the peel and seeds,but also promoted the development of passion fruit industry.In this paper,the whole fruit of passion fruit as raw material,the use of with cellulose and pectinase enzymatic to compound enzymolysis for increasing the rate of juice,then the optimization of technology of alcohol fermentation,vinegar fermentation were studied,and Antioxidant activity of passion fruit vinegar was evaluated.The specific research results are as follows:(1)The enzymatic hydrolysis technology of passion fruit by complex enzyme were studied,The optimal hydrolysis conditions of passion fruit that investigated by single-tests and orthogonal tests were enzyme dosage 0.12%,enzyme ratio(Cellulase: Pectinase)5:1,hydrolysis temperature 50 ℃,pH4.0 and time 3.5 h.Under such conditions,juice yield of Passion Fruit was 92.91%.(2)Passion fruit pulp after enzymatic hydrolysis prepared passion fruit wine,the use of response surface method analyzed fermentation conditions.The optimal fermentation conditions were determined as follows: inoculating amount of yeast 0.05%,sugar degree 21.8%,fermentation time 6 days,fermentation temperature 29 ℃,under these optimal conditions,the alcoholicity was 10.7 % vol,sugar content of about 5.6%,with the color of scarlet,clear pan-gloss,with a strong passion fruit flavor.(3)On the basis of optimal alcohol fermentation,the fermentation process of passion fruit vinegar was studied,The optimum process determined by factorial experiment and response surface method were Acetic acid bacteria volume11%,shaking speed 166 r/min,fermentation time 10 d,in this condition,the total acid content of 5.37 g/100 mL.(4)The use of DPPH· scavenging ability,·OH scavenging ability and reducing ability evaluated for antioxidant capacity of passion fruit vinegar,compared with fruit wine and apple cider vinegar,the DPPH· scavenging capacity of passion fruit vinegar increased by 32% and 53%;the ·OH radical scavenging capacity of passion fruit vinegar was 45%,56%,and 60% higher than that of passion fruit juice,passion fruit wine,and apple cider vinegar;The results showed that passion fruit vinegar has good antioxidant activity.