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Ling J.,China Tobacco Yunnan Industrial Co. | Ling J.,Sun Yat Sen University | Rong M.-Z.,Sun Yat Sen University | Zhang M.-Q.,Sun Yat Sen University
Chinese Journal of Polymer Science (English Edition) | Year: 2014

Polyurethanes consisting of tri-functional homopolymer of hexamethylene diisocyanate (tri-HDI) and polyethylene glycol (PEG) are synthesized, in which photo-reversible coumarin moieties act as pendant groups. Accordingly, the polyurethanes can be repeatedly self-healed under UV lights at room temperature by taking advantages of the photodimerization and photocleavage habits of coumarin. Molecular weight of the soft segment, PEG, is found to be closely related to the healing performance of the polyurethanes. Lower molecular weight PEG that corresponds to higher initial coumarin concentration in the polymer is critical for obtaining higher healing efficiency in the case of the first healing action. Nevertheless, it does not guarantee high reversibility of the photo-remendability during the repeated healing events. In contrast, the polyurethane with moderate molecular weight PEG has achieved balanced performance. Reaction kinetics is less important for the healing effect. © 2014 Chinese Chemical Society, Institute of Chemistry, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg. Source

Tai Z.,Kunming University of Science and Technology | Chen A.,Kunming University of Science and Technology | Qin B.,Kunming University of Science and Technology | Cai L.,Yunnan University | Xu Y.,China Tobacco Yunnan Industrial Co.
European Food Research and Technology | Year: 2014

In this study, it was found that the ethyl acetate soluble fraction of Musa basjoo flowers was a rich source of antioxidant, due to its high total phenolic contents and significant antioxidant activity. Ten phenolic compounds were isolated from this plant. They are gallic acid (1), caffeic acid methyl ester (2), guaiacylglycerol (3), 3-(3,4-dihydroxyphenyl)-acrylic acid 1-(3,4-dihydroxyphenyl)-2-methoxy carbonyl ethyl ester (4), thero-guaiacylglycerol 8-O-β-d-glycopyranoside (5), quercitrin (6), buein (7), (2R, 3S)-5,7,3′,4′,5′-pentahydroxyflavanonol (8), isoquercitrin (9) and 1,7-bis(3,4-dihydroxyphenyl)-hepta-4E, 6E-dien-3-one (10). In addition, compounds 1, 2, 4, 6, 7, 8, 9 and 10 possessed potent strong free radical scavenging activity. Compounds 1 and 10 with powerful activity showed the higher content, implying important roles of 1 and 10 for the antioxidant activity of Musa basjoo flower. The study suggested that components of Musa basjoo flower possessed good antioxidant capacities and the species could be used in the prevention of diseases related to oxidant by-products of human metabolism. © 2014 Springer-Verlag Berlin Heidelberg. Source

Prabhu D.M.,Sun Yat Sen University | Prabhu D.M.,Gulbarga University | Quadri S.R.,University of Medical Sciences and Technology | Cheng J.,Yunnan Institute of Microbiology | And 7 more authors.
Journal of Antibiotics | Year: 2015

A moderate growing strain designated as MPKL 26T was isolated from a soil sample of Bidar Fort, Karnataka, India. The strain MPKL 26T was Gram positive, bent rod in shape. The optimum pH and temperature for growth was 7.0 and 30 °C, respectively. The 16S ribosomal RNA gene sequence analysis revealed that strain MPKL 26T was closely related to S. atrocyanea DSM 20127T (98.09%), S. flava CW 108T (98.04%), S. soli CW 59T (97.99%) and S. notoginsengisoli SYP-B575T (97.0%) and showed DNA-DNA hybridization relatedness (46.05±1.2, 33.56±2.55, 32.56±1.7 and 26.79±2.5, respectively, between these strains) less than the threshold value for the delineation of genomic species. The peptidoglycon type was A3α type with glycine, alanine, lysine and glutamic acid as the amino acids. The whole-cell sugars ere fructose, ribose, mannose, glucose and galactose. The polar lipids were diphosphatidylglycerol, phosphatidylglycerol and phosphatidylinositol along with three unknown polar lipids. The fatty acid profile contained C14:0, C16:0, iso-C14:0, iso-C15:0, iso-C16:0, iso-C17:0, anteiso-C15:0, anteiso-C17:0 and summed feature 4 (17:1 iso I/anteiso B). The predominant respiratory quinine was MK-9(H2) with MK-10(H2), MK-8(H2) and MK-8(H4) as minor respiratory quinines. The G+C content of the genomic DNA was 68.8 mol%. On the basis of phenotypic, chemotaxonomic and molecular characteristics, the strain MPKL 26T represents a novel species of the genus Sinomonas, for which the name Sinomonas mesophila sp. nov. is proposed with MPKL 26T as the type strain (=NCIM 5552T= JCM 30094T). © 2015 Japan Antibiotics Research Association All rights reserved. Source

Eid K.,CAS Changchun Institute of Applied Chemistry | Eid K.,University of Chinese Academy of Sciences | Malgras V.,Japan National Institute of Materials Science | He P.,China Tobacco Yunnan Industrial Co. | And 6 more authors.
RSC Advances | Year: 2015

Precise control over composition and structure is highly important for designing highly active nanostructured electrocatalysts. Herein, we report a one-step strategy to directly synthesize trimetallic Pt-Pd-Ru nanodendrites in an aqueous solution at room temperature. These newly designed nanodendrites exhibit superior catalytic activities for both methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR) in comparison with bimetallic Pt-Pd nanoflowers and commercially available Pt/C catalysts. © 2015 The Royal Society of Chemistry. Source

Miao M.-M.,China Tobacco Yunnan Industrial Co. | Li L.,China Tobacco Yunnan Industrial Co. | Li L.,Kunming Medical University | Shen Q.-P.,China Tobacco Yunnan Industrial Co. | And 9 more authors.
Fitoterapia | Year: 2015

Abstract Four new flavones, tobaflavones E-H (1-4), together with two known flavones (5 and 6), were isolated from the leaves of Dali Tiandeng tobacco (a variety of Yunnan local air cured tobacco). Their structures were elucidated by spectroscopic methods, including extensive 1D- and 2D NMR techniques. Compound 2 is the first naturally occurring flavone bearing a (4-hydroxy-6-methyl-2-oxo-2H-pyran-3-yl)methyl moiety. These compounds were also evaluated for their anti-tobacco mosaic virus (anti-TMV) activity. The results revealed that compounds 1 and 2 exhibited high anti-TMV activity with inhibition rate of 35.3% and 39.6%, respectively. The rates are higher than those of positive control. The other compounds also showed potential anti-TMV activity with inhibition rates in the range of 18.7-28.4%, respectively. © 2015 Elsevier B.V. Source

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