1. oxidation reaction: after jackfruit is cut, the pulp is exposed to the air, and the polyphenols in it will be oxidized to brown. This phenomenon is called oxidation reaction. Therefore, the color of the freshly cut jackfruit pulp is usually light yellow or light white, but it will gradually turn brown after being placed in the air for a period of time.
2. Maturity: The discoloration of jackfruit pulp may also be due to maturity. Mature fruits will undergo some chemical changes, which will lead to the change of pulp color. For jackfruit, when it is ripe, the pulp will turn dark yellow or orange.
According to the picture you provided, we can see that the first picture is just cut jackfruit pulp, and the color is light yellow or light white. But the pulp in the second picture has turned transparent, which may be caused by over-ripening. When the jackfruit is ripe, the sugar and water in it will increase, thus making the pulp more transparent.
It should be noted that if the color of jackfruit pulp changes too quickly or too seriously, it may be caused by over-ripening or improper storage, and it is recommended not to eat it.