Gansu Tobacco Industrial Co.

Lanzhou, China

Gansu Tobacco Industrial Co.

Lanzhou, China
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Bai X.,Lanzhou University | Lu S.,Lanzhou University | Cao Z.,Lanzhou University | Ni B.,Gansu Tobacco Industrial Co. | And 5 more authors.
Carbohydrate Polymers | Year: 2017

In the present work, a thermosensetive copolymer with a low gelation concentration under 37 °C, F127@ChS (F127 crosslinked chondroitin sulfate) was synthesized via DA click chemistry between F127-AMI (maleimido terminated F127) and ChS-furan (furfurylamine grafted chondroitin sulfate). Then, dual crosslinked hydrogels were prepared based on F127@ChS and PEG-AMI (maleimido terminated polyethylene glycol). The physical crosslinking of F127@ChS affords the hydrogel fast gelation behavior, while in situ DA click reaction occurred between F127@ChS and PEG-AMI affords the hydrogel system covalent crosslinking. The dual crosslinked injectable hydrogel was applied as scaffold to load BMP-4 for rat cranial defect repair. As indicated by X-ray imaging, cranial digital images and histological (HE and Masson) staining analysis, new bone tissues were formed in the defected area after 12 weeks repair. The results demonstrate that the novel dual crosslinked injectable hydrogel offer an interesting option for cranial bone tissue engineering. © 2017 Elsevier Ltd

Lu S.,Lanzhou University | Bai X.,Lanzhou University | Liu H.,Lanzhou University | Ning P.,Lanzhou University | And 4 more authors.
Journal of Materials Chemistry B | Year: 2017

Current hydrogels based on chondroitin sulfate (ChS) generally lack the necessary strength and precise mechanical tunability. Addressing these limitations, covalent cross-linking has evolved to produce hydrogels with desirable properties. However, such a methodology always precludes injection and self-healing. In this study, we employ DA click chemistry and dynamic acylhydrazone bond cross-linking for hydrogel formation that overcomes the limitations of current ChS hydrogels. Dynamic acylhydrazone bonds afford the hydrogel injectability and self-healing ability, while DA click chemistry facilitates the employment of covalent crosslinking for stabilization in vivo and modulating hydrogel properties in vivo. The study reveals that the obtained hydrogel possesses highly tunable viscoelastic and rheological properties, swelling and degradation behavior, and injectability and self-healing ability compared with ChS hydrogels cross-linked by single DA click chemistry or acylhydrazone bonds. Meanwhile, this hydrogel shows increased viability and reduced apoptosis of rat mesenchymal stem cells, and excellent tissue adhesive ability in vivo. The hydrogel was loaded with BMP-4 and used as a scaffold for rat cranial bone tissue engineering. The results demonstrated that new bone tissue was detected in the defected area of the cranial bone. Thus, this cytocompatible, injectable and self-healing hydrogel with tunable properties can be used as a scaffold for cranial bone tissue engineering and promote bone formation. © 2017 The Royal Society of Chemistry.

Bai X.,Lanzhou University | Lu S.,Lanzhou University | Liu H.,Lanzhou University | Cao Z.,Lanzhou University | And 6 more authors.
Carbohydrate Polymers | Year: 2017

Bone disease is a public health problem around the word, and it is urgent to develop novel tissue engineering scaffolds for the complicated cranial bone regeneration. The present work developed a novel triple crosslinked polysaccharides based injectable hydrogel to composite bio-glass (BG) for cranial bone repair. Dynamic mechanical analysis showed the storage modulus (G′) of the hydrogel reached to ∼4000 Pa. While after compositing BG, G′ exceeded 4500 Pa. The degradation behavior of the hydrogel is influenced by hydrogel composition, crosslinking methods and degradation environment. Through compositing BG for rat cranial bone repair, excellent bone regeneration effect was achieved (chunks of “white” new tissue was detected in the defected site, HE histopathological analysis confirmed the new tissue was bone tissue). Thus, the hydrogel is suitable as the carrier of BG for bone repair, demonstrating the prepared triple crosslinked hydrogel is potential for bone tissue engineering applications. © 2017 Elsevier Ltd

Zang Z.,Gansu Tobacco Industrial Co. | Lu Z.,Gansu Tobacco Industrial Co. | Wang W.,Gansu Tobacco Industrial Co. | Peng S.,Gansu Tobacco Industrial Co. | Yang Y.,Gansu Tobacco Industrial Co.
Tobacco Science and Technology | Year: 2014

In order to improve the accuracy of test results, the measurement uncertainty of benzene and its five homologues (toluene, ethylbenzene, p-xylene, m-xylene, o-xylene) in water-based adhesive by GC/MS was analyzed and evaluated via establishing rational mathematical models and analyzing the main sources of uncertainty in this measuring method. The results showed that the expanded uncertainty values of the six analytes ranged from 0.006 to 0.019 mg/kg (k=2). On the basis of the weights of various components of uncertainty, the five selected experimental factors in the order of their influence on determination results were ambient temperature < repeated measure < standing time < apparatus measuring < curve fitting.

Xie G.,Lanzhou University | Xie G.,Lanzhou University of Technology | Mao N.,Gansu Tobacco Industrial Co. | Zhou L.,Lanzhou University | And 2 more authors.
Chinese Journal of Environmental Engineering | Year: 2015

Acidified carbon nanotubes (CNTs)-reinforced polyurethane foam(PUF) based composite(CPUF) were fabricated by the in situ polymerization method. The structure and properties of the CPUF composite were investigated by fourier transform infrared spectroscopy(FT-IR), scanning electron microscope(SEM), thermogravimetric analysis(TGA) and tensile testing. The performance of adsorption, influencing factors and adsorptive effect after regeneration for removing nitrobenzene(NB) from simulated wastewater by CPUF composite were investigated. The results showed that the adsorption of NB by CPUF composite was better and under these conditions: pH of 5.4, CPUF composite amount of 2 g/L, contact time of 24 h, the amount of saturated adsorption of CPUF composite was reduced by temperature rising, but higher initial adsorption rate, the adsorption isotherms conformed to Langmuir adsorption isotherm in line with the Langmuir equation, belonged to the single molecular adsorption. Saturated CPUF composite could be regenerated with simple thermal method and the removal efficiency of NB by the regenerated sorbent did not drop obviously. ©, 2015, Science Press. All right reserved.

Li B.,CAS Zhengzhou Research Institute | Pang H.,CAS Zhengzhou Research Institute | Xie G.,China Tobacco Hunan Industrial Co. | Qin G.,Gansu Tobacco Industrial Co. | And 3 more authors.
Tobacco Science and Technology | Year: 2013

In order to study the influence of combustion improver(potassium citrate) content in cigarette paper on cigarette burning state, the cigarette samples with cigarette paper of different grammages and containing different rates of combustion improver were prepared. The temperature in cigarette was detected with fine-thermocouples. By revising Rosin-Rammler (R-R) particle size distribution model, a method for characterizing temperature distribution in cigarette burning cone was developed, where, burning cone volume V0, characteristic temperature Ts, and distribution parameter N were taken as characteristic variables. The effects of combustion improver content and grammage of cigarette paper on temperature distribution characteristics in cigarette during static burning, puffing, and smouldering stages were investigated. The results showed that: With the increase of combustion improver content and grammage of cigarette paper, 1) The highest temperature in burning cone decreased during the whole process of cigarette smoking. 2) The volume of burning cone increased in all of the three burning stages, and reached its maximum value at the end of a puffing. 3) The characteristic temperature Ts of burning cone raised gradually and the range of temperature distribution decreased during static burning; however during puffing, Ts raised and then dropped.

Han Y.-H.,China Tobacco Standardization Research Center | Han L.,Gansu Tobacco Industrial Co.
Chung-kuo Tsao Chih/China Pulp and Paper | Year: 2012

With the voice rising for resource saving and environment protection, there is a general trend of using vacuum metallization inner liner to replace with the composite aluminum foil paper for cigarette packaging. In this paper, we briefly introduced the quality protection capability, environment protection performance and machine adaptability of the vacuum metallization inner liner, technology, characteristic and identification method of the direct metallization paper and the transfer paper.

Qin G.,Gansu Tobacco Industrial Co. | Li B.,CAS Zhengzhou Research Institute | Lu D.,CAS Zhengzhou Research Institute | Xie G.,China Tobacco Hunan Industrial Co. | And 2 more authors.
Tobacco Science and Technology | Year: 2015

In order to study the combustion of tobacco biomass, four kinds of typical tobacco biomass (cut strips of middle leaves of flue-cured tobacco, expanded cut stem, expanded cut tobacco and reconstituted tobacco)were tested by TG-DSC at the heating rates of 5, 10, 15 and 20℃/min. The results showed that: 1)The combustion of volatile and fixed carbon in the four kinds of tobacco biomass was not a continuous process, volatiles and fixed carbon were ignited independently. 2)The combustion of volatiles and fixed carbon in expanded cut tobacco would overlap at higher heating rates (15 and 20℃/min). 3)By calculating the combustibility indexes of tobacco biomass, it was found that the combustion property of the four kinds of tobacco biomass did not obviously differ at the heating rates of 5 and 10℃/min, however that of expanded cut tobacco was better at a heating rate of 15 or 20℃/min. ©, 2015, Editorial Office of Tobacco Science and Technology. All right reserved.

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