Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract： A new solid compound inhibitor was prepared using solid 1,3-benzendiamine, potassium thiocyanate and methenamine as main raw materials. The corrosion inhibition behavior of the inhibitor for 20 carbon steel in pickling solutions (10% hydrochloric acid, 10% sulfuric acid and 10% nitric acid) were studied by static mass loss method, Tafel polarization curves and EIS test. The results show that with a dose 0.5% of the inhibitor the corrosion inhibition efficiencies for 20 carbon steel are all higher than 80% in the above-mentioned three acid solutions, among them the highest is 99.1% for the steel in 10% nitric acid. Results of Tafel polarization curves and EIS measurement show that the addition of the inhibitor can significantly reduce the corrosion rate of 20 carbon steel, which demonstrated the new inhibitor could form a film with excellent corrosion protectiveness on the surface of 20 carbon steel.
Subjects: Biology >> Botany >> Applied botany submitted time 2020-09-15 Cooperative journals: 《广西植物》
Abstract：建立HPLC法同时测定大果山楂果实中原儿茶酸、绿原酸、二氢咖啡酸、咖啡酸、根皮酸、p-香豆酸、阿魏酸和肉桂酸的方法，并分析这8种酚酸在不同产地大果山楂果实中的含量。采用ZORBAX SB-C18色谱柱，以甲醇/1.5%甲酸水溶液（v/v）为流动相，梯度洗脱，柱温35 ℃，流速1.0 mL•min-1，检测波长280 nm、320 nm。结果表明：在线性范围内8种酚酸质量浓度与色谱峰峰面积的线性关系良好，相关系数均＞0.997，检出限0.08~0.20 μg•mL-1，定量下限0.27~0.67 μg•mL-1，变异系数均<5.0%，加标回收率99.3%~103.3%；10个不同产地的大果山楂果实中酚酸含量丰富，均检出原儿茶酸、绿原酸、二氢咖啡酸、咖啡酸、根皮酸、阿魏酸和肉桂酸7种酚酸，其中二氢咖啡酸、根皮酸、阿魏酸首次检出，以绿原酸为主（8 410.2~13 826.7 μg•g-1），占总酚酸的80%以上，总酚酸的质量分数在10 187.8~15583.9 μg•g-1之间，其中广西百色靖西和桂林恭城产的果实总酚酸质量分数相对较高，均大于15 000 μg•g-1。本研究的HPLC法适用于大果山楂果实中酚酸含量的测定，能为大果山楂优良品种的选育、产品质量控制及深度开发利用提供方法和科学参考。
Subjects: Biology >> Botany >> Applied botany submitted time 2020-09-15 Cooperative journals: 《广西植物》
Abstract：为了研究毛果巴豆枝叶中的化学成分，本实验采用硅胶、Sephadex LH-20柱色谱以及HPLC等多种色谱相结合的方法，对毛果巴豆枝叶95%乙醇提取物的乙酸乙酯萃取部位进行分离，从中得到8个化合物，通过波谱数据分析并结合文献比对，化合物分别鉴定为2β-hydroxyteucvidin acetate（1），2β-hydroxyteucvidin（2），crotoeurin B（3），山奈酚-3-O-(6″-O-顺式对香豆酰基)-β-D-吡喃葡萄糖苷（4），山奈酚-3-O-(6″-O-反式对香豆酰基)-β-D-吡喃葡萄糖苷（5），栗苷A（6），cerevisterol（7），尿嘧啶（8）。化合物2-7均为首次从该植物分离得到。
Subjects: Biology >> Botany >> Applied botany submitted time 2018-10-26 Cooperative journals: 《广西植物》
Abstract： Leersia hexandra Swartz is the chromium hyper-accumulative plant which was found firstly in China. The endophytic bacteria of L. hexandra Swartz and their removal capacity for Cr(VI) were studied in this paper. A Cr(VI)-resistant endophytic bacterium G04 was isolated from the roots of L. hexandra Swartz by the solid plate culture method using the media of beef extract peptone containing Cr(VI). Biological identification results showed the strain belonged to Enterobacter cloacae. Effects of culture conditions, such as initial pH, temperature, Cr(VI) concentration, liquid volume, inoculation amount, shaking speed and culture time, on the removal rate of Cr(VI), removal rate of total Cr and the growth of the strain were studied in detail using the method of shaking flask culture. The results showed that the optimal conditions for the removal of Cr(VI) by E. cloacae G04 were as followed: initial pH of 5.0, culture temperature of 37 ℃, substrate concentration of 100 mg·L-1, liquid volume of 80 mL in 250 mL conical flask, inoculum size of 15%, shaking speed of 100 r·min-1 and culture time of 48 h.Under these conditions, the removal rate of Cr(VI) and total chromium were about 84% and 8%, respectively. The results of this study show that the endophytic bacteria Enterobacter cloacae G04 has better application potential for removing chromium. It may be used directly for remediation of soil and water environment contaminated of chromium, and also may be used as alternative strain for promoting plant remediation of chromium pollution. Furthermore, the result has an important reference value to illuminate the mechanism of chromium hyper-accumulation of L. hexandra Swartz.
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