Latest ArticlesWaste utilization is not only the protection of the environment and the practice of green chemistry, but also one of the ways to develop new materials. Herein, we report two biomass carbon dots which prepared from bee pollen waste by one-step hydrothermal method. The new two carbon dots were used in sensing, cell imaging and plant growth regulation. The differences in the structure and properties of the two carbon dots were evaluated by TEM, XPS, TG and various spectroscopic methods. Both two carbon dots contain abundant functional groups, polyatomic doping, excellent water solubility and stable photoluminescence. Due to these good properties, we have demonstrated its versatile applications in Fe3+ sensing, cell imaging and plant growth regulation. It shows sensitive and specific Fe3+ responsiveness and good biocompatibility. This research provides a green and simple method for the recycling and reuse of bee pollen waste, and also provides a reference for the application of biomass carbon dots.
Cystic echinococcosis (CE) is one of the most harmful and life-threatening helminths. As the essential therapeutics, chemotherapy is always difficult to achieve desired anti-echinococcal effect due to the problems that the echinococcus granulosus cyst laminated layer makes the drug difficult to infiltrate and the poor solubility of drugs. In this study, we established a "breaking-then-curing" anti-echinococcal treatment strategy for efficient CE therapy. The photodynamic therapy (PDT) was used as a breaker to produce toxic reactive oxygen species (ROS) and damage the laminated layer of protoscolices (PSCs), leading to enhanced infiltration of albendazole sulfoxide nanoparticles (ABZSO NPs). Then, ABZSO NP was worked as curer for efficient anti-echinococcal treatment. As a result, the breaking-then-curing treatment strategy could generate more intracellular ROS in PSCs induced by plenty of ABZSO NPs, greatly increasing the mortality rate of PSCs in a shorter time than using ABZSO NPs alone, leading to the attenuation of laminated layer and finally disintegrating PSCs. We believe the "breaking-then-curing" strategy will suggest great potential in the treatment of CE and provide a new sight for anti-echinococcal treatment.
In this work, we developed a novel photoelectrochemical (PEC) sensor based on n-p organic semiconductor heterojunction for sensitive detecting MCF-7 cancer cells. BTA-C4Ph and PM6 were designed as photoactive materials to form n-p heterojunction, which greatly enhanced the photoelectric conversion efficiency. Antibody-modified magnetic nanoparticles were utilized to capture and separate MCF-7 cells from samples. Detection of MCF-7 is ascribed to the loading of MCF-7 onto BTA-C4Ph-PM6 modified electrode that resulted in the decrease of photocurrent intensity. The PEC immunosensor displayed a linear concentration ranging from 50 cell/mL to 1 × 104 cell/mL with a limit of detection (LOD) of 41 cell/mL (S/N = 3) for MCF-7. Additionally, the senor also exhibited good stability, excellent selectivity and prominent reproducibility. Furthermore, the sensor was successfully applied to detect MCF-7 in whole blood. This work illustrates that n-p heterojunction of organic semiconductor may find wide applications for the preparation of different photoelectrochemical sensors.
Compared with traditional photodynamic therapy (PDT), ultrasound (US) triggered sonodynamic therapy (SDT) has a wide application prospect in tumor therapy because of its deeper penetration depth. Herein, a novel MnSiO3-Pt (MP) nanocomposite composed of MnSiO3 nanosphere and noble metallic Pt was successfully constructed. After modification with bovine serum albumin (BSA) and chlorine e6 (Ce6), the multifunctional nanoplatform MnSiO3-Pt@BSA-Ce6 (MPBC) realized the magnetic resonance imaging (MRI)-guided synergetic SDT/chemodynamic therapy (CDT). In this nanoplatform, sonosensitizer Ce6 can generate singlet oxygen (1O2) to kill cancer cells under US irradiation. Meanwhile, the loaded Pt has the ability to catalyze the decomposition of overexpressed hydrogen peroxide (H2O2) in tumor microenvironment (TME) to produce oxygen (O2), which can conquer tumor hypoxia and promote the SDT-induced 1O2 production. In addition, MP can degrade in mildly acidic and reductive TME, causing the release of Mn2+. The released Mn2+ not only can be used for MRI, but also can generate hydroxyl radical (∙OH) for CDT by Fenton-like reaction. The multifunctional nanoplatform MPBC has high biological safety and good anticancer effect, which displays the great latent capacity in biological application.
Pure organic room-temperature phosphorescence (RTP) materials have attracted wide attention owing to their excellent luminescent properties and great potential in various applications. In this work, iminostilbene and its analogues are applied to realize RTP emission by copolymerizing with acrylamide. It can be concluded that the growth of alkane chain in monomers can enhance the lifetime and photoluminescence quantum yield of RTP emission, and polymers with the larger conjugated structure of the monomer show a longer RTP emission wavelength. This work provides a series of new pure organic RTP materials and might provide new thoughts for designing more advanced and superior RTP materials.
The abnormal activation of JAK2 kinase is closely related to the occurrence and progression of myeloproliferative neoplasms (MPNs). At present, there is still an obvious unmet medical need for selective JAK2 inhibitors in clinic. In this paper, a class of 2-aminopyridine derivatives as potent and selective JAK2 inhibitors was obtained by combining drug design, synthesis and structure-activity relationship studies based on the previously identified lead Crizotinib. Among them, 21b exhibited high inhibitory activity against JAK2 with an IC50 of 9 nmol/L, moreover, it showed 276- and 184-fold selectivity over JAK1 and JAK3, respectively. Besides, 21b had a significant antiproliferative activity against HEL cells, and also inhibited the phosphorylation of JAK2 and its down-stream signaling pathway. These results indicated that 2-aminopyridine compound 21b had the potential to be developed as a selective JAK2 inhibitor for further study.
Medical cotton dressing is cheap and widely used in diversified fields, but in the application of promoting wound healing, the continuous research of multifunctional medical cotton dressing is still of great significance. Here, we developed a fresh type of antibacterial cotton dressing through a succinct strategy based on chemically anchoring polyhexamethylene biguanide (PHMB). Intriguingly, after PHMB modification, the cotton dressing exhibited outstanding antibacterial performance which could maintain > 99.99% antibacterial rate after several treatments, including washing 50 times, repeated use 10 times, UV irradiation for 7 days, cationic dyes dying, and conditioned under 90 ℃ water bath for 2 h. In addition, the water contact angle of cotton dressing increased dramatically from 0° to 111°, which could facilitate bacterial adhesion, thus further enhance the antibacterial efficiency, and easily remove the bacterial debris. Apart from that, the developed cotton dressing showed good cytocompatibility, promoted blood clotting and expression of platelets, and promoted the wound healing process in the infection intervened skin wound model. Taken together, this antibacterial cotton dressing with desirable blood clotting, sustained protection against bacterial infection and bacterial removal features shows the potential to be a candidate for infected skin wound healing.
A [3 + 2]/[2 + 1] cycloaddition reaction of gem-difluorocyclopropenes is presented, offering a mild and efficient approach to accessing tri- and tetra-substituted 4-fluoropyridines in moderate to good yields with excellent regioselectivity. Multiple synthetic applications, including process-scale reactions, modification of bioactive molecules, derivatization reactions and synthesis of the analogue of the PKM2 modulator, are subsequently described.
A rhodium-catalyzed [4 + 3] cycloaddition reaction between N-methoxybenzamides and gem-difluorocyclopropenes is described. The reaction offers a mild and efficient approach towards the synthesis of fluorinated 2H-azepin-2-ones with broad substrate scope. A consecutive HOAc-assisted CN bond formation and fluorine elimination are involved as key steps for success as illustrated by detailed DFT studies.
Naphthyridine-fused bisimidazolium salts were designed and synthesized for the first time. The study of the Cu(Ⅱ) and Pd(Ⅱ) complexes demonstrated that the deprotonated dicarbene ligands are rigid chelating C, C-ligands with strong electron-donating ability in analogy with the classic phenanthroline N, N-ligands.
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