Jinmeng Zhu,Jinghan Ding,Yuke Li,Zhang He,Zhenzhen Ma,Wenqiang Dong,Xichen Zhao,Xuanhua Li
Organogels that lock organic solvents within a polymer network shows promising applications in ice-phobicity, anti-biofouling, conserving cultural heritage etc. However, the synthesis of organogels by versatile and cost-effective methods still remain challenging. Here, we introduce a novel and economical approach to organogel preparation via crystallization-induced polymer precipitation, which involves the straightforward blending of carbonyl contained polymer, nano Ca(OH) 2 , and excess ethyl acetate (EA). During the formation, nano Ca(OH) 2 reacts with EA to produce ethanol and calcium acetate, in which Ca 2+ ionically bonds with carbonyl of polymer. Due to the low solubility in EA and ethanol, calcium acetate initiates crystallization. The interaction between Ca(CH 3 COO) 2 and polymer induces the separation of polymer from the solvent, thereby forming a network that locks the surplus EA and ethanol. More importantly, the organogel is capable not only of encapsulating 12 organic solvents within its precursor but also of effectively removing various aged polymeric coatings from wall paintings without leaving residues. This innovative organogel system marks a significant forward in the realm of organogel with applications in conservation and surface engineering.
Living organisms such as corals can carry out CO2 looping efficiently via biomineralization under ambient conditions. Inspired by this natural process, we establish a solution system of calcium acetate–ethanol–water (Ca(Ac)2–C2H5OH–H2O) for CO2 chemical looping at constant room temperature. The CO2 capture is achieved by its reaction with Ca(Ac)2 to form calcium carbonate (CaCO3) mineral and HAc in the binary solvent with a high C2H5OH content. However, an increase in the H2O content in the system triggers acetic acid (HAc)-induced CaCO3 dissolution to release CO2. The system can be recovered for CO2 capture readily by the replenishment of C2H5OH. This biomimetic mineralization-based CO2 capture/release is controlled by the ionization states of the electrolytes, and is precisely regulated in the C2H5OH–H2O binary solvent. Our attempt highlights the fundamental principle of solution chemistry in reaction control and provides a bioinspired strategy for CO2 capture/release with very low cost and easy availability.
Fan Yang,Shuqi Liu,Zhonghuan Tian,Yujie Du,Deyao Zhang,Chao-an Long
Edetate salts are a kind of food additive regarded as candidates for chemical fungicides because of their lower toxicity and higher safety for the environment and human health. The antifungal activities of edetate salts have been determined in some phytopathogens except Penicillium digitatum , which causes the most destructive fungal disease during the citrus postharvest period. In the present study, we investigated the molecular mechanisms of calcium disodium edetate (EDTA-Na 2 Ca) against P. digitatum in deepth. The results suggested that EDTA-Na 2 Ca inhibited the P. digitatum P44 strain in vitro at a minimum inhibitory/fungicidal concentration (MIC/MFC) of 50 mmol L −1 . Meanwhile, EDTA-Na 2 Ca also inhibited P. digitatum in vivo by enhancing the host defense system. The P44 strain treated with EDTA-Na2Ca displayed a delayed conidial germination rate, expanded hyphal tips, thickened septa and cell walls, and destroyed mitochondria. Transcriptome sequencing and qRT-PCR analyses indicated that EDTA-Na 2 Ca suppressed the P44 strain primarily by disturbing the carbohydrate metabolism pathway, especially the synthesis of pyruvate in glycolysis. In addition, the adverse effects, including those on mycelial growth, pyruvate synthesis and superoxide dismutase activity, of EDTA-Na 2 Ca could be reversed by exogenous Mn 2+ , implying that Mn 2+ chelation is an essential mode of action. In summary, the current work verifies that EDTA-Na 2 Ca is a potential antifungal drug that cures citrus green mold probably by chelating Mn 2+ and targeting pyruvate synthesis in P. digitatum .
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