You must drink your orange juice long after it is opened or directly extracted from the fruit because prolonging air exposure of the juice may lessen or totally diminished vitamin c content and makes the juice useless to drink, an advice coming from a dietetic organization in the US. Always check the expiry date of the juice that can be found at the side, bottom, or top portion of the container.
The thorough studies and researches made by an Arizona state university was to measure the ascorbic acid content of various orange juice brands which were dissolved with water and refrigerated, juices which are packaged in regular tetra bricks, and juices in caps of screw tops. Further researches made a revelation that reconstituted orange juices have more vitamin c than ready to drink orange juices, and there is lesser vitamin c on orange juices sold in tetra bricks compared to containers in screw tops.
Later after two weeks of rigid testing, the nutrient level of 65 milligrams went down to 45 milligrams on refrigerated based juices, and drastically fell off to 36 milligrams after 4 weeks which was shown on the label. On the other hand, the good news is that an orange juice has other important vitamins and minerals that are not easy to destroy which makes an orange juice part of the daily recommended allowance by the US health authorities and other western countries.
There are many reasons why the shelf life of vitamin c endures for longer period of time like orange varieties, packaging methods, handling procedures, processing techniques, and orange fruit maturity which was based on thorough research. One of the main reasons why the potency of ascorbic acid decreases is the method called pasteurization, which eventually kills enzymes that makes vitamin c sterilized and no longer can be used as it should be than if you freeze the puree. It was also reported that food and beverage companies were adding more vitamin c to their products to make sure that consumers get the nutrition they deserve and regain the lost nutrients from degradation.
Measurements of ascorbic acid content in canned goods, fresh produce, and fruit juices are very well documented for determination purposes. One straightforward type of measurement is the polarographic method that requires no extraction sample or handling not unless otherwise the sample is in solid basis, and the usual procedure saves time for users as the procedure is to only dilute sample extracts then running voltammogram afterwards. Most of the time, these type of food produce contains colored or dyed materials that may not hinder using the voltammetric device. From the past years, voltammetry became a popular alternative to a perfectly simple technology to detect and analyze the amount of vitamin c your orange juice has. The voltammetric device is said to be the most popular technique for detection and analysis of vitamin c contents of your fruit beverages.
Using voltammetry method of detecting levels of vitamin c may require small amount of orange juice or nothing in which the outcome may be predicted by adding another glass of juice then you can test the result for more or less ten minutes. No fume extraction is needed when you use the voltammetric method, and maintaining and running this device are of lesser cost outwitting demands by industries for gauging levels of vitamin c on fruit juice products made.
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