一种测定巴西橡胶树树皮中过氧化氢含量的方法

研究植物体内 H2O2 的含量变化有助于确认植物提高非生物胁迫耐性的生物技术策略。Ti(Ⅳ)-PAR-H2O2 比色法灵敏度高、特异性强、稳定性好，广泛用于植物 H2O2 测定，但不同研究所用的反应条件不一致。在本研究中，系统优化了 Ti(Ⅳ)-PAR-H2O2 比色法的反应条件，并比较了丙酮提取法和 TCA 提取法对橡胶树萌条韧皮部 H2O2 的提取效果。结果表明，丙酮提取法稳定性差，TCA 提取法稳定性好。本研究报道了一种简单、快速的测定橡胶树树皮 H2O2 的方法，为进一步研究橡胶树中 H2O2 的生理功能打下良好基础。

An Improved Technique for Determination of Hydrogen Peroxide in Bark of Rubber Tree (Hevea brasiliensis Muell. Arg.)

Investigation of the H2O2 level induced by abiotic stress will be valuable for identifying biotechnological  strategies to improve abiotic stress tolerance in crop plants. The Ti (Ⅳ)-PAR-H2O2 spectrophotometric method for determination of H2O2 was found to give good sensitivity, specificity and stability, and it has been widely used for estimation of H2O2 in plant extracts. However, various reaction conditions of this method were used by different authors. This led us to optimize the suitable condition of this method. For sample preparation, extraction with CCl4/CH3Cl3 (3∶1, V∶V) and water in the proportion of 1∶3∶5 (V∶V∶V) after extracted with acetone were compared with the 5% the TCA extract method without activated charcoal in the bark of rubber trees. The 5% TCA method gives more stability than acetone method. In this paper, we described an easy and rapid protocol for determination of H2O2 in rubber tree bark using the Ti (Ⅳ)-PAR-H2O2 spectrophotometric method. Results could provide a basis for the investigation of the physiological function of H2O2 in rubber trees.