Why do oranges become bitter after freezing?

The reason why oranges become bitter after freezing is that orange peel and white meridian fiber contain a lot of bitter rosin. After freezing, orange cells were destroyed. The juice inside comes out, mixed with bittersweet, causing the bitter taste of oranges.

Orange, small trees, usually with thick thorns on the branches, new branches and tender petioles are often sparsely short-haired. The leaves are thick and papery, the wings are obovate and oval, and the top is round or obtuse. Wedge-shaped tip tapering to base, leaf blade ovate or lanceolate. The base is round or blunt, and the upper flat section of the leaf margin has fine teeth. Note that thawed oranges cannot be preserved again and need to be eaten in time.

Frozen oranges will be very cold, and the water vapor outside will be heavy, because the water vapor will condense when it is cold. At the same time, the whole orange becomes soft, because the supporting tissue of the orange is destroyed by ice crystals, which leads to the softening of the orange. When the orange is peeled, it is easy to peel off the orange peel, and a lot of water in the orange pulp is lost. The peeled oranges need to be frozen and thawed, and then peeled and eaten in the normal way.

Main varieties:

Blood oranges include Tulloch, Rose Blood Orange and Ruby Blood Orange. Both pulp and juice are purplish red or dark red. The pulp is tender and juicy with unique flavor, and the Mediterranean region is its origin and main producing area. The skin of blood orange is smooth, smaller than ordinary oranges, generally with small pits and red color. Because there are anthocyanins in blood orange, the pulp is red.

Red oranges are mainly produced in Lianjiang, Guangdong, and Lianjiang red oranges have large fruits. The fruit shape is good, the flesh color is orange-red, tender and smooth, the juice turns to residue, and the sweetness is sour. Sweet and fragrant, very popular. Therefore, it was listed as a state banquet, and Lianjiang was named as "the hometown of red and orange in China". The navel orange series includes Gannan navel orange, Xinfeng navel orange and Xunwu navel orange, and navel orange is a variety of Gannan navel orange. The fruit is bigger than ordinary oranges, generally seedless, parthenocarpic and easier to peel.