Sun Yanru,Gao Jing,Jin Xianrui,Li Shuhan,Hou Yexuan,Fu Lu,Zhang Wenhui
Penicillium oxalicum is a major postharvest pathogen of kiwifruit, causing substantial economic losses. This study investigated the antifungal activity and mechanism of sucrose monostearate (SMS) against P. oxalicum . The minimum inhibitory concentration (MIC) of SMS was determined to be 1.25 g L − 1 , which significantly inhibited spore germination by 88.28% and reduced mycelial growth by 65.94% ( p < 0.05). Mechanistically, SMS at 1.25 g L − 1 induced intracellular ROS accumulation by 1.7-fold, suppressed catalase (CAT) and peroxidase (POD) activities by 54% and 60%, and increased malondialdehyde (MDA) content by 2.5-fold, confirming severe membrane lipid peroxidation and content leakage. Scanning electron microscopy revealed marked hyphal deformation, and in vivo assays showed that SMS reduced kiwifruit lesion diameter by 83.7% compared to controls. These findings demonstrate that SMS, as a single-ester antifungal agent, disrupts fungal membrane integrity and exhibits strong potential for postharvest disease control.
Quantum-dots-doped covalent organic frameworks in a molecularly imprinted network (QDs-doped COFs@MIP) were developed for detection of nereistoxin (NRT)-related insecticide in tap water. The preparation of QDs-doped COFs@MIP was easy to accomplish via one-pot synthesis at room temperature. QDs-doped COFs@MIP quenched by targeting thiosultap due to the photoinduced charge transfer. A Brunauer–Emmett–Teller surface area of 186.20 m 2 g −1 and a maximum adsorption capacity of 771 mg g −1 of the QDs-doped COFs@MIP exhibited good selectivity and adsorption capacity. Direct fluorescence determination was established over the range 5–100 μg L −1 ( R 2 = 0.9959) with a detection limit of 1.60 μg L −1 . Furthermore, 86.5–106.5% recoveries of spiked tap water were achieved. The determination system was feasible for tracing the NRT-related insecticide with high accuracy and good repeatability and reproducibility.
.
Qinzhou Cai,Huifang Zhang,Bingshan Zhao,Lei Ren,Yonghua Wang,Fanghua Wang
Cold-adapted, alkali-stable lipases with surfactant tolerance are highly sought after in the detergent industry. In this study, we recombinantly expressed and characterized a novel lipase from Marinobacter nanhaiticus (MNL). The purified MNL exhibited high stability within a temperature range of 10–30°C and pH values of 8–10, demonstrating optimal activity at 20°C and pH 8. MNL has a preference for substrates with medium chains with the best activity being 3768.6 U/mg using p -nitrophenyl decanoate as a substrate. Remarkably, MNL showed enhanced enzymatic activity in the presence of ionic surfactants and displayed notable resilience when exposed to proteases. Washing performance analysis further revealed MNL's high proficiency in removing oil-based stains from fabrics. Collectively, these results suggest that MNL holds significant promise as a valuable component in laundry detergent formulations.
危险品化学品经营许可证（带存储）