Vitamin C is the most unstable vitamin which can be easily denatured. It should be kept at under 70 degree Celsius to avoid damage caused by the heat.
Vitamin C from any source can get destroyed in the process of cooking.
The age of a vegetable does not affect the vitamin C content. However, vitamin C can be destroyed by heat.
Vitamin C, a water soluble vitamin, is easily destroyed under heat.
Fish are not normally a source of vitamin C, since it is destroyed by cooking, but if you eat raw fish, they do contain vitamin C, and that was the source which sustained the Inuit.
Vitamin C or ascorbic acid is destroyed when we cook vegetables.
Vitamin C is a vitamin that is easily destroyed by light and irradiation. It is sensitive to heat and light exposure, meaning that storage and cooking methods can affect its concentration in foods. To preserve the vitamin C content, it is best to store foods rich in vitamin C in cool, dark places and avoid prolonged exposure to light.
They can be destroyed by heat, light, or anything that can come close to them.
a solid
No, It is not broken down by heat, light, or exposure to air.
Riboflavin
Vitamin C is highly sensitive to air, water, and temperature. Crystalline substances, including vitamin C, some vitamin B forms and other dietary supplements, are prone to a process called deliquescence, where humidity causes a water-soluble solid to dissolve and leach out of the vitamins. Exposure to elevated temperatures accelerates the degradation of vitamin C and destroys its ability to act as an anti-oxidant or otherwise provide any benefit. While vitamin C can degrade even without the oxygen in air, exposure to air is usually part of the process of degrading it. Even if it it packaged in nitrogen, as soon as a package is opened, it is exposed to the oxygen in the air and begins to degrade. Exposure to light can also hasten the degradation of vitamin C. Maximum storage time requires keeping vitamin C cool, dry, away from oxygen and away from light.
Vitamin C is sensitive for temperature and sodium hydrogen carbonate. When heated for a very long time, the amount of vitamin C will decrease. When heated at a constant temperature with a concentration of sodium hydrogen carbonate, more vitamin C will be lost.