活性氧（ROS）是生物体中至关重要的信号分子，能够调控多种生物过程。在植物体内，基础ROS水平不仅介导正常的生长发育，还通过精细调控的氧化还原网络通路，调控代谢、衰老及程序性细胞死亡等关键生理功能。此外，当植物遭受生物或非生物胁迫（如病原体侵袭、干旱或创伤）时，ROS会迅速积累，从而对作物产量产生不利影响。其中，过氧化氢（H2O2）被认为是主要的ROS，在细胞间和细胞内通讯中发挥关键信号转导作用。

Diagram and application of the portable visual and electrochemical H 2 O 2 sensors. Hydrogen peroxide is crucial in cell metabolism, playing key roles in cell proliferation, differentiation, and ...

Researchers have developed a new biochar material derived from marine microalgae that can detect hydrogen peroxide rapidly, sensitively, and without the need for enzymes. The discovery could support ...