Yueyue Meng,Zhiqiang Liang,Ming Yi,Ying Tan,Zhentong Li,Peng Du,Aili Li,Chun Li,Libo Liu
The current study was conducted to investigate the effects of zinc enrichment on the characteristics, metabolites and antioxidant activity of L. plantarum DNZ-4. Electron microscopy analysis showed that the ultrastructure of the zinc-enriched strain changed greatly both for surface and inside as compared to the control strain. The zinc-enriched strain showed higher acid production ability resulting in lower pH value. Resistance assays demonstrated that the zinc-enriched strain has stronger tolerance ability to acid, bile salt and H 2 O 2 than that of the control strain. Metabolites analysis indicated that the various metabolites in the zinc-enriched strain were altered significantly as a result of amino acids, energy and fatty acid metabolism affected by zinc enrichment. Furthermore, the antioxidant properties of the zinc-enriched strain, including radical scavenging capacity and the antioxidative enzyme activity increased significantly. These results suggest that zinc addition had a positive effect on the physiologic function of L. plantarum DNZ-4.
Corrosion is a thorny problem when steel reinforcement in sand–based autoclaved aerated concrete (SAAC) is in use. In this study, potassium silicate was used as the base material and muscovite and zinc powder were added as fillers to improve the coating properties. In addition to physical and mechanical properties, electrochemical tests including potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) were performed on the coatings. The phase composition, chemical composition and morphological differences of different coatings were also characterized. The results showed that zinc powder increased the density of the muscovite–potassium silicate coating and significantly improved the corrosion resistance and mechanical properties of the coatings. The prepared coatings exhibited stable qualities with no heat absorption and release before 365 °C. The adhesive strength and impact resistance of the coatings were as high as 2.43 MPa and 50 kg cm, respectively. The electrochemical test results showed that the coating resistance ( R c ), charge-transfer resistance ( R ct ), and polarization resistance ( R p ) of the C-5.5–55–40 coating were 23578, 3.542 × 10 5 , and 2.911 × 10 5 Ω cm 2 , respectively, which exhibited the optimal corrosion resistance.
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