交联羧甲基魔芋葡甘聚糖吸附重金属离子的研究

以异丙醇为分散剂,环氧氯丙烷为交联剂,在碱性介质中由一氯乙酸和魔芋葡甘聚糖(KGM)反应,制备了取代度为0.265和0.550的两种交联羧甲基魔芋葡甘聚糖(CMKGM),并将其用于吸附溶液中Cu2 、Pb2 和Cd2 。结果表明,CMKGM对3种重金属离子的吸附约在20min内达到平衡,与金属离子类型无关,吸附遵从二级动力学方程;pH对吸附量影响较大,适宜范围为5~6;吸附能较好地服从Langmuir等温吸附方程,CMKGM(DS=0.550)吸附Pb2 的最大吸附容量(Qm)为41.7mg/g,Langmuir常数(b)为0.305mg/L,均大于Cu2 和Cd2 相应值;再生后的CMKGM吸附性能好,脱吸附百分率高。     

Kinetic of Adsorption of Urea Nitrogen onto Chitosan Coated Dialdehyde Cellulose under Catalysis of Immobilized Urease

The adsorption of urea nitrogen onto chitosan coated dialdehyde cellulose (CDAC) under catalysis of immobilized urease in gelatin membrane (IE) was studied in batch system. The pseudo first-order and second-order kinetic models were used to describe the kinetic data, and the rate constants were evaluated. The experimental data fitted well to the second-order kinetic model.     

Dialdehyde in Heterocyclic Synthesis： Synthesis of Compounds Containing Two 4H-Benzopyran Building Blocks under Microwave Irradiation

The syntheses of 4H-benzopyran derivatives were investigated using dialdehyde as a key starting material. The reaction proceeds under microwave irradiation in good yield (87%--95%) with short reaction time (5--8 min),therefore providing a rapid and efficient method of synthesizing a variety of compounds containing two 4H-benzopyran units.     

Synthesis and Properties of IPN Hydrogels Based on Konjac Glucomannan and Poly（acrylic acid）

As a random copolymer of β-(1,4) linked D-mannose and D-glucose, konjac gluco- mannan (KGM) is a naturally occurring water-soluble polysaccharide, and has been paid attention in the field of drug controlled release carriers potentially used in colon1,2. …     

Synthesis and transformations of some new 2,4-bismethylene-1,3-ditelluretanes

A novel four-membered 1,3-ditelluretane dialdehyde 8/9 was synthesized from trimethylsilylethynyl tellurolate. The dialdehyde was transformed into extended tetrathiafulvalenes (14 and 15). These are the first examples of ditelluretane spaced TTF derivatives.     

羧甲基交联魔芋葡甘聚糖微球的制备与表征

采用交联魔芋葡甘聚糖颗粒(CKGG)合成了羧甲基交联魔芋葡甘聚糖微球(CMCKGG)，讨论了羧甲基化过程中的影响因素．用正交设计的方法确定了具有较好交换容量的CMCKGG制备奈件．当碱用量为CKGG量的20％，氯乙酸钠用量为CKGG量的10倍，温度55℃，反应时间8h时，制得的CMCKGG阳离子交换容量为0．7389mmol／g．红外光谱．光学显微镜和扫描电镜的结果表明，该颗粒为蜂窝状多孔微球，粒度均匀．     

含5-氟尿嘧啶水凝胶的制备及体外透皮释放

制备了一种魔芋葡甘聚糖接枝丙烯酸水凝胶,并将其作为亲水药物5-氟尿嘧啶(5-FU)透皮释放制剂基材.考察了不同魔芋葡甘聚糖与丙烯酸摩尔比的凝胶在pH 7.4的溶胀率,结果表明凝胶的溶胀率随丙烯酸含量的增加而增大.采用浸泡吸附法得到含5-FU的载药凝胶,利用改进Franz扩散池进行了离体小鼠皮肤透皮释放实验,在魔芋葡甘聚糖和丙烯酸摩尔比为1∶60,载药量为3%时获得的最大累积释放量为4 721.2μg/cm2,渗透速率为(542.2±53.0)μg.cm-2.h-1.     

高锰酸钾引发魔芋粉/丙烯酰胺接枝共聚合及其增稠性研究

用KMnO4作引发刺对魔芋粉(KGM)与丙烯酰胺(AM)进行了接枝共聚反应．研究了引发剂浓度、接枝单体浓度、体系酸度、反应温度、反应时间以及KGM预氧化时间等条件对接枝效率的影响．结果表明：在适宜的条件下，接枝效率可达90％以上，并且接枝物的水溶性与增稠性得到较大的改善。     

Studies on Single Chain Structure of Konjac Glucomannan

1INTRODUCTION The single chain structure of KGM is the ele-mentary acting unit of its biological function and viscoelasticity of mechanical properties.The re-search method of saccharide chain and the com-plexity of its structure have restricted the study on structure-activity relationship.Therefore,the studies concerning KGM both at home and abroad mainly focus on its application,whereas less on its structure.Previous researches were only related to the determination and distribution as…     

Frontal polymerization synthesis and characterization of Konjac glucomannan‐graft‐acrylic acid polymers

Konjac glucomannan‐graft‐acrylic acid polymers, used as superabsorbent polymers (SAPs), were synthesized by frontal polymerization (FP). The features of front propagation including front velocity and maximum temperature (T_max) were influenced by the amount of glucomannan, initiator, and environment temperature. The graft copolymer was characterized by FTIR, DSC, and SEM. The amount of crosslinking agent mainly determined the crosslinking degree of SAPs that would affect the water absorbency and microstructure. Water absorbency of SAP was also investigated and most of them displayed high water absorption rate. The aforementioned results allow us to conclude that FP can be considered as a promising method to fabricate SAP for its excellent advantages. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 3391–3398, 2009