关键词: 冠菌素, 降解, pH, 温度, 光, 氧化剂

Abstract: Coronatine (COR) is a novel multifunctional plant growth regulator. In order to observe the stability of COR in aqueous solution and provide guidance for its production, storage and usage, this study measured the content of coronatine under various treatments by HPLC, and explored the effects of temperature, pH, light and oxidizing agent on the stability of coronatine. The results showed that under 25℃ and 50℃ and in 3 kinds of buffered solutions with pH 4.01, 6.86 and 9.18 for 180 d, the coronatine degradation rate was less than 16%. The half-life of being hydrolyzed was all over 1 year, and it was not easy to be hydrolyzed. High temperature could significantly stimulate COR hydrolyzation under extreme pH environment, especially in strong alkali condition. No significant hydrolysis was observed within 180 d under fluorescent lamp irradiation. The half-life of COR was only 61.9 h under UV light, which indicated that COR was sensitive to UV and stable to visible light. In the presence of H2O2, COR hydrolyzation was significantly speed up. With the treatment of H2O2 for 12 h at room temperature and 70℃, COR degraded 75% and 81%, respectively. The results suggested that COR was stable to temperature, pH and visible light, but sensitive to UV and oxidizing agent. It should be kept away from the agricultural chemicals with strong oxidation function during operation and storage.

Key words: coronatine, degradation, pH, temperature, light, oxidizing agent