How is it possible that fruit juice sold at health food stores (the one which is 100% fruit juice, and preservative free) is shelf-stable? (Meaning does not need to be refrigerated) I'm talking about the one which is sold in glass or plastic bottles, NOT the one in Tetra-Paks, I DO know how Tetra Pak/Tetra Brik work. Some non-freshly squeezed bottle fruit juice is in the refrigerator and some is on the shelf. What's the difference?? Why can't the one in the fridge be on the shelf since it's not fresh squeezed?
Chemistry - 3 Answers
Random Answers, Critics, Comments, Opinions :
1 :
the shelf stored juice has no air in the container so it will not go bad. once it is open and air is introduced it needs to be refrigerated to keep it from going bad. it is vacum packed when you break the seal you will see the level of the juice drop as outside normal pressure is restored
2 :
cyberfly is WRONG! It isn't vaccum packed because when you open it it doesn't pop and the juice does not go down! Still you didn't even answer her question, she asked what's the difference between those that are refridgerated. They both don't pop or the volume go down therefore they're packed the same way! Sorry but I had to say that event though I don't have your answer.Good luck.
3 :
The preservative free fruit juices in the health shop have undergone a process called aseptic packaging. Another way of saying this would be sterile packaging. The product, in this case fruit juice is prevented from going bad by a process that kills all the bacteria and deactivates enzymes before being packed. This can be done by heating the juice, (pasteurisation) exposure to UV light etc. When the "sterile" juice is packed in a sealed container the ingress of foreign bacteria etc is prevented and the product has a long shelf life at room temperature. This is the same process used to store fruit, meat etc in tin cans where no preservatives are necessary. The canning process is carried out at a high temperature, whereas the aseptic packing of health food fruit is much gentler in order to preserve the goodness of the product. Once the container is opened, and foreign air borns bacteria can gain entry, the product can deteriorate very rapidly unless other precautions are taken, such as refrigeration
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