Abstract: The effects of light, temperature, pH, oxidants, reductants, and metal ions on the stability of leaf chlorophyll from tumorous stem mustard were explored. Chlorophyll was extracted by acetone and determined by U-3010 ultraviolet and visible spectrometer. The results showed that the stability of chlorophyll from the leaves of tumorous stem mustard was affected by many factors including light, H2O2, vitamin C, acid, alkali and several metal ions. The chlorophyll was stable when temperature was 10－70 ℃, and temperature over 80 ℃ could result in a decrease of its stability. In addition, neutral condition and Na2SO3 revealed a hyperchromic effect on the chlorophyll.

Key words: tumorous stem mustard, chlorophyll, stability