Photodynamic therapy (PDT) has been increasingly used in the clinical treatment of neoplastic, inflammatory and infectious skin diseases. However, the generation of reactive oxygen species (ROS) may induce undesired side effects in normal tissue surrounding the treatment lesion, which is a big challenge for the clinical application of PDT. To date, (–)-Epigallocatechin gallate (EGCG) has been widely proposed as an antiangiogenic and antitumor agent for the protection of normal tissue from ROS-mediated oxidative damage. This study evaluates the regulation ability of EGCG for photodynamic damage of blood vessels during hematoporphyrin monomethyl ether (Hemoporfin)-mediated PDT. The quenching rate constants of EGCG for the triplet-state Hemoporfin and photosensitized ¹O₂ generation are determined to be 6.8×108 M^?1S^?1 and 1.5×108 M^?1S^?1, respectively. The vasoconstriction of blood vessels in the protected region treated with EGCG hydrogel after PDT is lower than that of the control region treated with pure hydrogel, suggesting an efficiently reduced photodamage of Hemoporfin for blood vessels treated with EGCG. This study indicates that EGCG is an efficient quencher for triplet-state Hemoporfin and ¹O₂, and EGCG could be potentially used to reduce the undesired photodamage of normal tissue in clinical PDT.

Intelligent food packaging with the multisensory analysis is promising as the next generation technology of food packaging. The oxygen content in food packaging is one of the crucial parameters affecting the food quality and shelf life. Caviar is among the most nutritious and costly food sources. Here, a photonic oxygen-sensing system, based on the time-resolved phosphorescence spectroscopy of a platinum complex, is developed for non-contact, non-intrusive, and real-time vacuum packaging quality control, and implemented for caviar packaging. The sensor is embedded in protective polyethylene layers and excited with a short-pulsed light emitting diode (LED) source. Integration of a blue pulsed light source, a fast and amplified silicon photodiode controlled by the Spartan-6 field programmable gate array (FPGA), and a long lifetime platinum complex results in a photonics-based oxygen sensor with a fast response and high sensitivity to the vacuum packaging damage, which is suitable for caviar. It is revealed that applying the polyethylene layers protects the caviar from the platinum complex, leaching while not interfering with the sensor functionality. Characterizing the photonic system based on its sensitivity, repeatability, stability, and long-term operation demonstrates its capability for this application.

过度使用抗生素导致的水污染，对自然环境和人类健康造成了重大威胁。低温等离子体作为一种绿色环保的高级氧化技术，被认为是一种最具前景的抗生素降解方法之一，然而在降解效率和能量效率方面还有待进一步提高。利用纳秒脉冲放电激励针-水结构气液放电，获得了一种能产生高活性等离子体的瞬态火花模式放电，并应用于水中四环素降解，研究了脉冲电压、频率、初始浓度、初始pH值等参数对四环素降解的影响，结果表明初始浓度50 mg/L，脉冲电压9 kV、频率2 kHz，初始pH值为中性的条件下四环素的降解率最高，处理时间10 min时降解率达到了91.6%，能量效率和每阶电能分别为0.165 g·kW⁻¹·h⁻¹和0.78 kW·h·m⁻³。自由基淬灭实验表明羟基自由基 (·OH) 在四环素降解过程中起主要作用，而H₂O₂和O₃的作用稍弱。细胞毒性实验也表明气液放电处理10 min后的溶液毒性显著下降。

自2001年被发明以来，超导纳米线单光子探测器（SNSPD）迅速成长为近红外波段的明星光子探测器，其在近红外波段如1550 nm处系统探测效率超过95%，暗计数率低于1 cps（counts per second），时间抖动优于10 ps，探测速率高于1 GHz，并广泛应用在量子信息领域。近年来，研究人员开始将SNSPD引入到生物领域，以替代在近红外波段具有低信噪比、多后脉冲的半导体单光子探测器。本文将介绍SNSPD的探测原理和性能指标，并系统地阐述SNSPD在生物领域中的应用现状和发展前景。

采用蒙特卡罗模拟技术对血管组织在可见光波段的多光谱成像进行建模仿真，通过分析不同血氧饱和度下血液后向散射功率的绝对值、相对值、绝对差值和对比度，并考虑可能的干扰因素，优选出适合内窥环境下使用的450 nm、525 nm、630 nm和660 nm 4个成像波段。基于4个优选的成像波段展开了血氧饱和度检测的实验验证。在血管仿体组织上的实验结果表明，在95%的置信水平下，血氧饱和度的检测偏差为1.24%。研究结果验证了利用四波段进行内窥组织血氧饱和度检测的可行性。