Jian-Feng Ge

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Malaria is a serious infectious disease caused by protozoan parasites in tropical and subtropical regions. Even inhabitants of temperate zones are exposed to the danger of malaria infection because of travel and global warming. Novel, effective, safe, and inexpensive drugs are required to treat malaria and contribute to the global goal of eradication. A(More)
New pH-activatable ratiometric fluorescent probes have been developed that have a coumarin structure attached to benzothiazole or indole units with one or two conjugated bonds. They have optical responses in acidic conditions. Probes with benzothiazole (1) and indole (2, 3) units have opposite responses to changes in pH, in terms of shifts in absorption and(More)
A new probe based on the squaraine skeleton with a 2,4-dinitrobenzenesulfonyl unit is reported as a fluorescent probe for biothiol. It shows turn-on properties with red emission towards biothiols in acetonitrile-PBS buffer (1 : 9, v/v) solution, and its properties of rapid response, high selectivity and high sensitivity make it a potential probe with real(More)
In this paper, the design of a lysosome-targetable pH probe that has a fluorescent OFF (pH = 4) to ON (pH = 5-6) response is described to identify lysosomes in normal cells. The mechanism of photoinduced electron transfer with a fluorophore-based reaction (FBR-PET) was proposed. Benzo[a]phenoxazines with electro-donating aryl groups were selected, its(More)
Hydrogen sulfide has recently been identified as a biologically responsive species. The design and synthesis of fluorescence probes, which are constructed with Nile-red or Nile-blue fluorophores and a fluorescence-controllable dinitrophenyl group, for hydrogen sulfide are reported in this paper. The Nile-red-dinitrophenyl-ether-group-based probe (1a) is(More)
Two dibenzoxanthenium derivatives bearing a 3,4-diaminophenyl group, compounds 1a and 1b, have been prepared and evaluated as near-infrared probes for the detection of nitric oxide. Compound 1a gave a 3-fold emission enhancement towards nitric oxide at 681 nm, whereas compound 1b exhibited OFF-ON emission behavior towards nitric oxide, resulting in a(More)
A simple strategy to prepare AIE polymers is invented using an AIE initiator for atom transfer radical polymerization. The dual photoresponse by intramolecular charge-transfer and luminogen aggregation of the initiator is well-realized and even enlarged after polymerization, due to the linkage of polymer chains.
A series of 5-phenyliminobenzo[a]phenoxazine derivatives were synthesized. The in vitro antiprotozoal activities were evaluated against Plasmodium falciparum K1, Trypanosoma cruzi, Leishmania donovani and Trypanosoma brucei rhodesiense. N,N-Diethyl-5-((4-methoxyphenyl)imino)-5H-benzo[a]phenoxazin-9-amine shows IC(50)=0.040 μmol L(-1) with a selective index(More)
In vivo antimalarial drug candidates screening test was carried out on a series of water-soluble 3,7-bis(dialkylamino)phenoxazin-5-ium derivatives. Among them, 3-(diethylamino)-7-(piperidin-1-yl)phenoxazin-5-ium chloride (SSJ-206) showing highest efficacy was chosen for further pharmcodynamics and pharmacokinetics study. It was supported from these data(More)