Improvement of physicochemical stability of highly-concentrated antibodies using cyclodextrin polypseudorotaxane hydrogels

Recently,a large number of antibodies have been utilized as biodrugs,and their subcutaneous formulations are required to allow the self-administration.However,because of the lower administration capacity of subcutaneous formulation than intravenous ones,highly-concentrated antibody formulations(>100 mg/mL)are desired.Regretfully,highly-concentrated antibodies often cause aggregation during the long-term storage and transportation,resulting in the loss of pharmacological activity and induction of immunogenicity.On the other hand,we previously reported the potential use of polypseudorotaxane(PPRX)hydrogels consisting of polyethylene glycol(PEG,MW 20,000)and cyclodextrins(CyDs)as sustained release systems for protein drugs such as insulin and lysozyme.

Fabrication of a polypseudorotaxane nanoparticle with synergistic photodynamic and chemotherapy

A polypseudorotaxane（PPR） nanoparticle was fabricated by the self-assembly of m PEG-protoporphyrin IX（PpIX） conjugate and a-CDs via the host-guest interaction.The nanoparticle loaded with anticancer drug doxorubicin（DOX） exerted synergistic photodynamic and chemotherapy.The nanoparticle was spherical with the mean size of 89 nm,the low critical micelle concentration（CMC） of DOX-loaded nanoparticle was 9.3 mg/m L and the drug loading content was 9.93%.The in vitro anticancer activity test revealed that the DOX-loaded nanoparticle exhibited promising reactive oxygen species（ROS）cytotoxicity and chemotherapeutic efficacy to cancer cells.The PPR nanoparticle is potentially promising for synergistic photodynamic and chemotherapy for cancers.

A pillar[5]arene-based side-chain pseudorotaxanes and polypseudorotaxanes as novel fluorescent sensors for the selective detection of halogen ions

A pseudorotaxane and its polypseudorotaxanes formed between pillar[5]arene moieties and noctylpyrazinium cations as novel fluorescent sensors for the selective detection of halogen ions were reported.A collapse of these pillar[5]arene-based pseudorotaxanes and polypseudorotaxanes occurred upon the addition of Cl,Br,and I（tetrabutylammonium salts）,respectively,leading to their fluorescence recovery.The fluorescence enhancement of the pseudorotaxane and the polypseudorotaxanes increases in the order of I

Synthesis and Properties of pH and Temperature Responsive Copolymer with Pesudorotaxane Structure

pH and temperature responsive copolymers PNAM4VBCB of N-isopropyl acrylamide（NAM） and complex pseudorotaxane monomer N 1-（4-vinylbenzyl）-1,4-diaminobutane dihydrochloride with cucurbit[6]uril（CB[6]） threaded（4VBCB） were prepared via free-radical polymerization in aqueous solution.The copolymers were characterized by 1 H NMR,Fourier transform infrared（FTIR） spectrometry,elemental analysis,and static light scattering.The thermodynamic properties of the copolymers were studied by thermogravimetric analysis（TGA）,and the effects of pH and the concentration of the copolymer on the average hydrodynamic radius（R h） were studied by dynamic light scattering（DLS）.In addition,the thermal sensitivities of the copolymers were studied by DLS and UV-Vis.The experiment data show that CB[6] beads are localized on 1,4-diaminobutane units in the side chains of the copolymer.TGA data show that thermal stability of the copolymers increases with the adding of CB[6] threaded because of the enhanced rigidity and the bulky steric hindrance of 4VBCB in the side chain of PNAM4VBCB.DLS data show that the average hydrodynamic radius of copolymer increases with the increase of the copolymer concentration and has a jump with adjusting pH due to the existing of the small size CB[6] dethreaded from the copolymer with increasing pH.Both pH and electrical conductivity curves of the solution of PNAM4VBCB-4 have a jump because CB[6] could dethread from the copolymers with the addition of NaOH.In addition,the copolymers have thermal sensitivity and their phase-change temperatures could be controlled by adjusting the molar ratio of NAM to 4VBCB in the copolymers.