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Research Progress in Mulberry Leaf Flavonoids
LUO Wentao;FENG Juhong;WANG Lixiang;HE Shaonan;SUN Kunhui;LIU Qi;HU Xuelei;Flavonoids are important active components in mulberry leaves,which have pharmacological actions such as antioxidation,hypoglycemic effect,and anticancer.In this paper,we review the extraction methods,separation and purification methods,content determination,and pharmacological actions of mulberry leaf flavonoids in recent years.
The Application Development of Quantum Dots in the Field of Biomedicine
YU Bing1,2,XIAO Guo-hua1,CONG Hai-lin1,2,WANG Zong-hua1,2,LIU Xiao-mian1,2(1.College of Chemical and Environmental Engineering,Qingdao University,Qingdao 266071,China;2.Laboratory for New Fiber Materials and Modern Textile,Growing Base for State Key Laboratory,Qingdao University,Qingdao 266071,China)Quantum dots are a new type of semiconducter luminescent nanomaterials.Having special surface effect,dielectric effect and quantum effect in structure,quantum dots possess many novel optical properties,and develop rapidly in the fields of biomedicine and analytical chemistry.According to the latest research developments,the fabrication and modification of quantum dots and biomedical application progress of the quantum dots based probes are reviewed in this article,and the future direction of development is forecasted.
The Application of PCR-DGGE in the Analysis of Microbial Community Diversity in Water Treatment System
LU Yong,CHEN Bing-juan,SHEN Shi-feng,YAN Lian-he,ZHOU Shen-fan,ZHANG Jian-fa(School of Chemical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)The principle of PCR-DGGE and common problems and solutions in experimental process were described.The application and limitations of PCR-DGGE in the analysis of microbial community diversity in water treatment system were reviewed,and prospect of the technique was proposed as well.
Study on Antioxidant Activity of Ganoderma Lucidum Polysaccharide
ZHANG Zhi-jun,LI Shu-fang,WEI Xue-sheng,CHEN Xiao-ming(The Forestry and Fruits Institute of Tianjin,Tianjin 300112,China)Reduction ability of Ganoderma lucidum polysaccharide was determinated by the reduction method of potassium ferricyanide,and its scavenging ability for free radicals ·OH and ·O-2 were studied.The results showed that Ganoderma lucidum polysaccharide had reduction activity and scavenging ability for free radicals,and the dose-effect relationship of the scavenging ability and polysaccharide concentration exhibited certain positive correlation.
Optimization in Ultrasonic-Assisted Extraction Process of Polysaccharides from Lycium ruthenicum Murr.by Response Surface Methodology
TANG Jing;ZHOU Yanhong;CUI Jianqiang;WEN Juanjuan;Using liquid-solid ratio, ultrasonic time, ultrasonic temperature, and ultrasonic power as factors, we optimized the ultrasonic-assisted extraction process of polysaccharides from Lycium ruthenicum Murr.by response surface methodologies on the basis of single-factor experiments.The optimal extraction conditions can be determined as follows: the liquid-solid ratio of 20∶1(mL∶g),the ultrasonic time of 40 min, the ultrasonic temperature of 60 ℃,and the ultrasonic power of 180 W.Under above conditions, the extraction rate of polysaccharides from Lycium ruthenicum Murr.is 9.19%.
Synthesis and Characterization of Transition Metal Complexes with Salicylaldehyde-Amine Dis-Schiff Base
LI Cui-qin1,MENG Xiang-rong2,ZHANG Peng1,JING Chang-rong2,LIU Chang-huan1,ZHU Xiu-yu1(1.College of Chemistry & Chemical Engineering,Northeast Petroleum University,Daqing 163318,China;2.No.1 Chemical Plant,Daqing Petrochemical Company,Daqing 163714,China)The ligand of salicylaldehyde-amine dis-Schiff base was synthesized by Schiff base reaction using ethylenediamine and salicylaldehyde as raw materials.Three kinds of transition metal complexes were prepared by complexing Cu,Zn and Ni with the Schiff base.The structure of products was characterized by elemental analysis,IR and UV-Vis.The results of characterization proved the structure of salicylaldehyde-amine ligand conformed with the target construction,and stable transition metal complexes were formed by it with Cu,Zn and Ni,respectively.
Synthesis of Carboxylic-terminated Polyethylene Glycol
LI Xian-hong, CUI Ping, LIU Zhen-zhen (Department of Chemistry and Biological Science , Xiangfan University ,Xiangfan 441053 ,China)Carboxylic-terminated polyethylene glycol was synthesized from polyethylene glycol and maleic anhydride. The optimum conditions were:molar ratio of polyethylene glycol to maleic anhydride was 1: 2. 8,the reaction time was 6 h,and the reaction temperature was 170℃.
Research Development of Gemini Surfactants
HUANG Hong,LEI Ming,HUANG Wei-xin(School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510640,China)Gemini surfactants are a family of surfactants containing two or more hydrophobic-hydrophilic groups.Gemini surfactants have many excellent properties such as high surface activity,low interfacial tension and strong synergistic effect etc owing to their novel structure.The research development of synthesis of Gemini surfactants are reviewed.It is pointed out that Gemini surfactants have extensive application prospect.
Progress in Synthesis of Amino Acid-Based Amphoteric Surfactants
KONG Yu-ming1,LUO Yue1,REN Zhao-hua1,LIU Guo-lin2,TAN Liang-bo2(1.College of Chemistry and Environmental Engineering,Yangtze University,Jingzhou 434023,China; 2.College of Petroleum Engineering,Yangtze University,Jingzhou 434023,China)Amino acid-based amphoteric surfactants are a kind of environmental friendly surfactants based on biological substances.The different synthesis methods and progress for two types of carboxylic amino acid-based amphoteric surfactants(N-alkyl-β-aminopropionic acid and N-acylamino acid) were summarized.The synthetic routes of sulfonic,sulphonic,phosphatic and other amino acid-based amphoteric surfactants were related in brief.It was pointed out that enzymatic method and chemo-enzymatic method had broad application prospect in the synthesis of amino acid-based amphoteric surfactants.
Optimization in Ultrasonic Extraction Process of Polysaccharides from Astragalus-Radix Puerariae Herb Pair by Response Surface Methodology and Its Antioxidant Activity
YAN Hao;CHENG Fan;YAN Furong;GU Qiong;YU Li;WANG Yifan;Taking the extraction rate of polysaccharides from Astragalus-Radix Puerariae herb pair as an evaluation index, we optimized the ultrasonic extraction process of polysaccharides from Astragalus-Radix Puerariae herb pair by response surface methodologies on the basis of single-factor experiments, and evaluated its antioxidant activity by the determination of scavenging rates of hydroxyl free radicals, DPPH free radicals, and superoxide anion free radicals.The results show that the optimal ultrasonic extraction process can be determined as follows: the liquid-solid ratio of 17∶1(mL∶g),the extraction time of 30 min, and the extraction temperature of 57 ℃.Under above conditions, the extraction rate of polysaccharides from Astragalus-Radix Puerariae herb pair can reach 13.78%.Polysaccharides from Astragalus-Radix Puerariae herb pair has certain antioxidant activity, and the deproteinization of polysaccharides can effectively improve its antioxidant activity.