Showing papers by "Xingfa Gao published in 2020"
TL;DR: The novel bismuth sulfide S3 @Bi NRs overcome the major obstacles of conventional photosensitizers during the PDT process and exhibit a promising phototherapeutic effect, supplying a new strategy for hypoxic tumor elimination.
Abstract: Photodynamic therapy (PDT) efficacy has been severely limited by oxygen (O2 ) deficiency in tumors and the electron-hole separation inefficiency in photosensitizers, especially the long-range diffusion of O2 toward photosensitizers during the PDT process. Herein, novel bismuth sulfide (Bi2 S3 )@bismuth (Bi) Z-scheme heterostructured nanorods (NRs) are designed to realize the spatiotemporally synchronous O2 self-supply and production of reactive oxygen species for hypoxic tumor therapy. Both narrow-bandgap Bi2 S3 and Bi components can be excited by a near-infrared laser to generate abundant electrons and holes. The Z-scheme heterostructure endows Bi2 S3 @Bi NRs with an efficient electron-hole separation ability and potent redox potentials, where the hole on the valence band of Bi2 S3 can react with water to supply O2 for the electron on the conduction band of Bi to produce reactive oxygen species. The Bi2 S3 @Bi NRs overcome the major obstacles of conventional photosensitizers during the PDT process and exhibit a promising phototherapeutic effect, supplying a new strategy for hypoxic tumor elimination.
101 citations
TL;DR: A metal-free phosphorous and nitrogen dual-doped porous hollow carbon sphere nanozyme with robust peroxidase-like activity in acidic environment is developed and it is demonstrated that the nanozyme-IAA combination is an effective enzyme-prodrug activation strategy for tumor targeted catalytic therapy.
96 citations
TL;DR: A wide variety of nanomaterials possess peroxidase-like catalytic activities and show promise as cost-effective and versatile replacements for natural peroxIDases, but a universal tool for pre-treatment of these materials is still needed.
Abstract: A wide variety of nanomaterials possess peroxidase-like catalytic activities and show promise as cost-effective and versatile replacements for natural peroxidases. However, a universal tool for pre...
65 citations
TL;DR: The rational design of a nano-modulator for tumor hypoxia with long term stability is a promising way to enhance the outcome of tumor therapy and achieves a significantly enhanced antitumor effect in the combination of doxorubicin.
61 citations
TL;DR: It is made an interesting finding that two-dimension (2D) SnSe is capable of mimicking native dehydrogenases to efficiently catalyze hydrogen transfer from 1-(R)-2-(R')-ethanol groups.
Abstract: While dehydrogenases play crucial roles in tricarboxylic acid (TCA) cycle of cell metabolism, which are extensively explored for biomedical and chemical engineering uses, it is a big challenge to overcome the shortcomings (low stability and high costs) of recombinant dehydrogenases. Herein, it is shown that two-dimensional (2D) SnSe is capable of mimicking native dehydrogenases to efficiently catalyze hydrogen transfer from 1-(R)-2-(R')-ethanol groups. In contrary to susceptible native dehydrogenases, lactic dehydrogenase (LDH) for instance, SnSe is extremely tolerant to reaction condition changes (pH, temperature, and organic solvents) and displays extraordinary reusable capability. Structure-activity analysis indicates that the single-atom structure, Sn vacancy, and hydrogen binding affinity of SnSe may be responsible for their catalytic activity. Overall, this is the first report of a 2D SnSe nanozyme to mimic key dehydrogenases in cell metabolism.
49 citations
TL;DR: This work investigates the possible catalytic mechanisms of graphene-based nanomaterials using DFT calculations and indicates that the carbonyl groups are the active centers in the catalytic cycle.
Abstract: Graphene-based nanomaterials, including graphene oxide (GO) and reduced graphene oxide (rGO), play key roles in the nanozyme field. GO and rGO carrying various oxygen-containing functional groups, including epoxy, hydroxyl, ether, endoperoxide, carbonyl, carboxyl, and ester, have been reported to display peroxidase mimicking activities. However, the active center and the underlying mechanism responsible for its peroxidase mimicking activities still remain unclear. Herein, taking the oxidation of 3,3,5,5-tetramethylbenzidine (TMB) by H2O2 as the model reaction, we investigate the possible catalytic mechanisms using DFT calculations. The results indicate that the carbonyl groups are the active centers. The activation of the CO bond is the key step in the catalytic cycle. The results will help realize the rational design of carbon-based nanozymes.
27 citations
01 Jan 2020
TL;DR: The catalytic behaviors, kinetics, and mechanisms are the basic criteria to determine if a nanomaterial with intrinsic activity is a nanozyme, and Michaelis–Menten model is usually used to analyze the kinetics parameters.
Abstract: The catalytic behaviors, kinetics, and mechanisms are the basic criteria to determine if a nanomaterial with intrinsic activity is a nanozyme. Michaelis–Menten model is usually used to analyze the kinetics parameters including affinity constant, reaction velocity, and catalytic efficiency for natural enzymes. Nanozymes follow similar kinetics and mechanisms as natural enzymes. However, the active sites and detailed physiochemical processes responsible for the catalysis in nanomaterials may be different, regarding the features including composition, crystal structure, defects, electron transfer, substrate adsorption, and product dissociation. There may be common nature for the catalysis of nanozymes and natural enzymes.
10 citations
TL;DR: In this paper, the substituent effects on the electronic structures and peroxidase-mimicking activities of γ-graphyne (GY) and Pd-doped GY are studied by density functional theory calculations.
Abstract: The substituent effects on the electronic structures and peroxidase-mimicking activities of γ-graphyne (GY) and Pd-doped GY are studied by density functional theory calculations. Both the inductive...
8 citations
TL;DR: Using the Lewis base to coordinate sp2 borons, this article constructed B5L5− cyclic compounds with six π-electrons and further constructed half-sandwich and sandwich compounds.
3 citations
TL;DR: In this article, a new structural unit, radical half-sextet, was introduced to model the π-electronic configurations of NGs, which can be used as the general model for NGs.
2 citations