Oranges are the most delicious when they are fresh. Oranges are rich in vitamin C and citric acid, the former has the effect of beauty and beauty, the latter has the effect of eliminating fatigue.

And the thin peel on the inside of the orange contains dietary fiber and pectin, which can promote defecation and lower cholesterol.

If you keep oranges in a normal temperature, dry, ventilated and cool place, you can generally keep them for a week or so. Oranges are easy to lose water and rot if they are kept for too long, so it is best not to store them for more than a week.

Although oranges can be stored in the refrigerator, they will lose water and affect the taste, and oranges are more likely to go bad in the refrigerator.

Even if you must keep it in the refrigerator, keep it for 3-5 days at most, and do not put it in the freezer. Generally speaking, it is not recommended to keep oranges in the refrigerator.

Factors affecting the storage time of oranges.

1. In the general temperature range, the higher the temperature, the shorter the shelf life and the faster the orange will go bad.

2. Generally speaking, the oxygen content of the orange preservation environment will also affect the storage time, the less oxygen content, the easier to preserve.

3. The less bacteria and humidity in the preservation environment, the easier it is to preserve oranges.

The orange was still blue when it was first picked from the tree, and it will be sweet if it is sour for a long time. Due to the storage time is too long. This is because oranges still breathe after picking.

This respiration produces more sugar in oranges, but the water in oranges is lost during preservation, and it feels sweeter after eating oranges. This is also the saccharification process of oranges.

Not only oranges, but many other fruits will become sweet in a few days. However, it should be noted that the longer the oranges are stored, the sweeter they are, and to a certain extent, it will be enough.

Not only does the taste become sweet, but the color of the orange also changes, mainly because of the change of the skin. The skin of oranges contains chloroplasts.

When the orange is ripe, it will induce the chloroplast to transform into a colored body containing a lot of carotene and lutein, so the orange will change from green to yellow when it ripens.

But oranges can not be kept for too long, oranges will dry for too long, because they lose too much water and even breed more harmful bacteria. A substance that causes oranges to rot and spoil.

There is also a skill in buying oranges.

1. The oranges bigger navel is more fragrant and sweeter. On the contrary, the oranges smaller navel indicates sour. When buying oranges, try to choose oranges with circles at the bottom.

2. Choose oranges with sunken stalks, and try not to choose prominent oranges. These oranges are more sour by comparison, which means they look more round and better overall, while the sharp taste is not good.