Influence of the storage temperature, the dimensions of the tuber and the nitrogenous nutrition on the content of vitamin C in the potato.
Tedone L.
5th International Postharvest Symposium . Volume of Abstract . Verona, Italy 6-11 June 2004, p.56
2004
บทคัดย่อ
L-ascorbic acid (AsA) is an important and ubiquitous compound for the higher plants.It is found in high concentration in leaves and some fruits and storage organs (Mapson et al, 1958, 1970).
The AsAis important for many important physiological process, like the redox processes during photosynthesis, protection against environment-induced oxidative stress (ozone, UV, high light, SO2 etc), during wound and pathogen induced oxidative processes.The antioxidant property of AsA is one of the main function in humans, who are unable to synthesize this acid.One of the main, and cheap source of AsA in the world is the potato, which supply for a good percentage of the world human requirements.The AsA content in the tissues change depending on the techniques of cultivation adopted, storage conditions and the physiological age of the tuber.For this reason, an activity has been conducted to check the evolution of AsA content, chemically determined by HPLC, to quantify the AsA in the tissues, by silver nitrate staining to identify the location in the tissues.
The experiment has been conducted using tubers coming from plants submitted at different fertilization regimes and from tubers stored under different conditions:
-about 20 °C, dark
-5 °C, dark
The results show the presence of modification in AsA content depending on the physiological age of the tubers, the N fertilization and dimension of tuber.