Storage temperature affects the pH level of some juices, particularly orange juice, which has a higher pH level when it is cold and a lower pH level at temperatures higher than normal room temperature. Citric acid is present in most fruits and fruit juices.Know More
Orange juice has a pH level or around 3.5, but is already quite acidic, thanks to the citric acid found in the juice. Citric acid is a weak acid, which means it will not completely dissolve in water.
Although the pH level of orange juice does change based on temperature, these changes are fairly small. Assuming the baseline pH level of orange juice is 3.5, temperature variables may cause changes in the range of 3.46 or 3.54, basing calculations on the pKa of citric acid.
However, because citric acid is not the only component of orange juice, basing calculations purely on the acid will not necessarily give accurate pH changes, although they will tend to be in a similar range.
Most fruits contain citric acid in varying quantities, meaning that many fruit juices also contain it. In general, the same method and analysis can be applied to most fruit juices. Because changes in pH level are so small however, it is unlikely to be noticeable to anyone drinking the juice.Learn more about Food Storage
Use of galvanized steel containers for food storage or container gardening can be dangerous because of the chance of zinc, possibly contaminated with cadmium, leaching from the steel and entering the food chain. In particular, the acid content of some foods can corrode the zinc coatings of galvanized steel containers. Zinc absorbed by the body can be responsible for minor illness, and cadmium irritates the stomach severely.Full Answer >
The two main conditions that cause enzymes to denature are an increase in temperature and an increase in the pH level. Enzymes work during a specific set of conditions, such as certain temperatures and pH levels, so if either are altered, they can lose their shape and ability to function.Full Answer >
Coating apple slices with highly acidic juice, such as pineapple or lemon juice, helps deter browning. Apples brown when they come into contact with air and oxidize. Acidic juices slow down the oxidation process because they contain antioxidants.Full Answer >
One can keep freshly baked brownies up to four day at room temperature in a closed plastic container. However, this is only true for brownies that do not have a frosting that consists of eggs or dairy ingredients such as buttercream.Full Answer >