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Mechanism Of Orange Juice Deaeration

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Decanter Figure 9, is fed with the blurred orange juice Figure 10 then clear orange juice and pomace of oranges are gained at the end of the process.

Figure 10. Mechanism of a decanter

Deaeration

Prior to pasteurization, orange juice is deaerated because the presence of dissolved oxygen effects on color, flavor and most importantly vitamin C. One of the key steps of orange juice processing is deaeration since vitamin C has high sensitivity of oxygen. Removing air from orange juice provides to minimize oxidative reactions such as oxidation of ascorbic acid and flavor compounds, and also to decrease corrosion if the package of juice is made of metal. In addition to this point, the ascorbic acid content of orange juice is also affected by high oxygen permeability containers. Another negative effect of oxygen is giving a brown color. During orange juice processing there are some possibilities of entraining air during pumping, mixing and tank filling. The product quality can be improved by vacuum deaerator Figure 11. The capacity of the equipment is 3 tons/hour. Residual O2 levels below 0.5-1.0 mg/L depending on product. Figure 11. Deaerator machine set

Pasteurization

Escherichia coli O157:H7 can grow in fruit juices with pH greater than 4. Since pH of orange juice is less than 4, E. Coli is not a key microorganism for orange juice. The outbreaks in orange juice have been caused by Salmonella spp. which is related with unpasturized orange juice. Hence, Salmonella is

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