改性魔芋葡甘聚糖与苯丙乳液共混体系流性能研究

研究了改性魔芋葡甘聚糖与苯丙乳液共混体系的流变性能，结果表明，改性魔芋葡甘聚糖对苯丙乳液有极好的混溶性，增稠性及流平性。     

羧甲基葡甘聚糖的制备

葡甘聚糖经羧甲基化改性后,其溶解性、抗潮性、成膜性能等明显改善,可用作空心胶囊的囊材。通过正交试验,得出了葡甘聚糖羧甲基化改性作囊材的最佳反应条件：6g魔芋精粉,6g氯乙酸,1．2g碘化钾,70℃水浴反应4h,所得产物的取代度为0.571。研究了改性后羧甲基葡甘聚糖的理化性能。     

魔芋葡甘聚糖基敷料的研究及其应用进展

魔芋葡甘聚糖因具有良好的生物相容性、吸水性及凝胶性而被广泛应用于医用敷料领域，且魔芋葡甘聚糖含量丰富，又可生物降解，以魔芋葡甘聚糖为基底的医用敷料的部分性能较传统类型敷料有其独特优势，同时通过物理和化学等改性，可以研究出各种性能不同的新型敷料。本文总结了魔芋葡甘聚糖的近年来的研究，和其在敷料领域的应用。最后对魔芋葡甘聚糖敷料的发展做出展望。     

魔芋葡甘聚糖改性胶的研究

用氯乙酸对魔芋葡甘聚糖进行醚化改性，研究了反应温度、反应时间、氢氧化钠和氯乙酸用量对醚化反应的影响。并对改性前后其水溶胶的溶解度、黏度、稳定性、粘接强度及成膜性进行比较。     

魔芋葡甘聚糖的H2O2氧化改性及其流变性能研究

用过氧化氢（H2O2）对魔芋葡甘聚糖进行氧化改性，探讨了不同料液比、PH值、温度、H2O2加入量及反应时间对氧化反应的影响，得到最佳的反应条件为：料液比为1：4、PH为7．5、反应温度为45℃，H2O2加入量为2．4％，反应时间为4h；改性魔芋葡甘聚糖水溶胶非牛顿行为显著降低，溶胶粘度稳定性及酸碱稳定性大幅提高。     

改性魔芋葡甘聚糖与苯丙乳液共混体系流变性能研究

研究了改性魔芋葡甘聚糖与苯丙乳液共混体系的流变性能.     

魔芋葡甘聚糖的改性修饰及其应用

详述了魔芋葡甘聚糖的改性修饰技术．如化学改性、物理改性、生物改性等。评述了魔芋的深加工及作为生物降解性材料的应用。     

魔芋葡甘聚糖的H2O2氧化改性及其流变性能研究

用过氧化氢(H2O2)对魔芋葡甘聚糖进行氧化改性,探讨了不同料液比、pH值、温度、H2O2加入量及反应时间对氧化反应的影响,得到最佳的反应条件为料液比为1∶4、pH为7.5、反应温度为45℃、H2O2加入量为2.4%、反应时间为4 h;改性魔芋葡甘聚糖水溶胶非牛顿行为显著降低,溶胶粘度稳定性及酸碱稳定性大幅提高.     

乙酸酐对魔芋葡甘聚糖的改性

研究了乙酸酐对魔芋葡甘聚糖的改性,制备了魔芋葡甘聚糖醋酸酯,优化了制备工艺条件,得出了酸性催化剂条件下,乙酰化魔芋葡甘聚糖的最佳改性工艺条件为:n(乙酸酐)∶n(魔芋葡甘聚糖)=4 8∶1,反应温度50℃,反应时间4h,催化剂c(H2SO4)=0 038mol/L,取代度DS=0 662。物化性能测试表明,取代度超过0 270时,魔芋葡甘聚糖醋酸酯在水中溶解;60℃时最大溶解度为w(魔芋葡甘聚糖醋酸酯)=12%,取代度超过0 469时,魔芋葡甘聚糖醋酸酯能制成均匀的薄膜,膜厚10～30μm。     

魔芋葡甘聚糖材料疏水改性的研究进展

介绍了魔芋葡甘聚糖与高分子材料共混疏水改性的方法,评述了化学改性中魔芋葡甘聚糖脱乙酰基化、交联、接枝共聚、互穿聚合物网络、羧甲基化等疏水改性的最新研究进展,探讨了其今后的研究方向,并提出了开发热塑性KGM材料这一前沿性课题。     

The effects of graphene oxide on the properties and drug delivery of konjac glucomannan hydrogel

Konjac glucomannan (KGM) hydrogel has good potential application in food and medical science, although to achieve this, the physical and mechanical properties need further improvement. In this study, graphene oxide (GO) was used to improve the functionality of KGM hydrogel. KGM/GO hydrogels were prepared by freezing the alkaline KGM/GO sols. Rotational rheometer was used to study the rheological properties of different alkaline KGM/GO sols. Fourier transform infrared, Raman, differential scanning calorimetry, thermogravimetric analyses, and scanning electron microscopy were used to evaluate the structure and properties of the hydrogels. In addition, different pH solutions and an in vitro assay were used to study the swelling property and the release behavior of KGM/GO hydrogels, respectively. The result revealed strong hydrogen‐bond interaction between KGM and GO. The incorporation of GO highly improved the gel properties of KGM/GO sol, higher thermal stability, and more compact structure of KGM/GO hydrogels. KGM/GO hydrogels showed better swelling properties in deionized‐distilled water and pH 7.2 PBS. The release of 5‐aminosalicylic acid (5‐ASA) from KGM/GO (KG4) hydrogel was different in various pH media, but the initial burst release effect was very severe. Therefore, incorporation of GO have a good potential in enhancing the properties of KGM hydrogel, but KGM/GO hydrogel is not an ideal carrier for 5‐ASA release. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 45327.     

改性魔芋葡甘聚糖纳米晶对聚乙烯醇薄膜性能的影响

通过硫酸水解魔芋葡甘聚糖(KGM)得到魔芋葡甘聚糖纳米晶(NKGM),再表面接枝3-(三甲氧基硅丙基)十八烷基氯化铵,与壬基酚聚氧乙烯醚硫酸钠反应等过程得到改性KGM纳米晶类流体(NKGMf);然后采用溶液流延法制备了含NKGM和NKGMf的聚乙烯醇(PVA)薄膜;通过傅里叶变换红外光谱仪、透射电子显微镜、扫描电子显微镜、热失重分析仪、拉伸测试仪等对NKGM、NKGMf的结构和PVA薄膜的性能进行表征。结果表明,经改性后,NKGM的片状结构得以保留,在PVA基质中的分散性增加,薄膜的起始分解温度提高了23℃,拉伸强度提高了34.7%,其中,NKGMf的最佳含量为3%(质量分数,下同)。     

魔芋葡甘聚糖/凹凸棒石纳米复合材料的制备及性能

以江苏盱眙提纯凹凸棒石（attapulgite,AT）为原料,以魔芋葡甘聚糖（konjac glucmannan,KGM）为基体,采用共混法制备了KGM/AT纳米复合材料,探讨了凹凸棒石质量分数、KGM质量分数对纳米复合材料性能的影响。力学性能测试结果表明：当魔芋用量为0.50%、凹凸棒石用量为0.02%时,复合材料的综合力学性能最好,与纯魔芋膜相比,其拉伸强度、断裂伸长率和弹性模量分别提高54.95%、19.97%、10.79%。利用Fourier红外光谱、扫描电子显微镜对纳米复合材料进行了表征,结果表明：AT的引入,KGM分子某些特征峰的波数发生了明显变化,凹凸棒石与魔芋葡甘聚糖发生了强烈的相互作用形成了新的界面层,且AT在纳米复合材料中分散性较好。     

Reinforcing and toughening of polyurethane by chemically modified Konjac glucomannan nanocrystal

Konjac glucomannan (KGM) nanocrystal obtained from native KGM by sulfuric acid hydrolysis was modified by using benzoyl chloride, and the improvement of hydrophobicity was confirmed by contact angle measurements. The chemically modified KGM nanocrystals with nanosize smaller than 100 nm, which confirmed by TEM, were used as fillers to prepare polyurethane nanocomposites. The morphology, thermal stability, and mechanical properties of the polyurethane nanocomposite films were investigated by means of SEM, TGA, and tensile testing. It is worth noting that the obtained KGM/PU nanocomposites showed simultaneous enhancements both in strength and elongation. The synergistic interaction between the fillers and the matrix played an important role in the improvement of mechanical properties. POLYM. COMPOS., 38:1447–1453, 2017. © 2015 Society of Plastics Engineers     

A novel membrane on pervaporation performance for dehydration of Caprolactam solution

Konjac glucomannan (KGM) is a kind of polysaccharide with wide applications, except in pervaporation (PV). This article focuses on the new function of KGM and simultaneously improving a new dehydration process for ?-Caprolactam (CPL). KGM was cross-linked with glutaraldehyde (GA) at proportions of 0.3, 0.5, and 0.7 wt%. Cross-linked membranes were characterized by scanning electron microscope, Fourier transform-infrared, and X-ray diffraction to assess the membranes of morphology, intermolecular interactions, and observe the effects of cross-linking on crystallinity, respectively. Cross-linked KGM as the active layer of the composite membranes has the net matrix structure, and many characteristics improved compared with pure KGM. Data showed that KGM cross-linked with GA displayed good swelling and PV performance, and the composite membranes had superior separation performances in dehydrating the CPL solution. The highest separation factor could reach 3531. The study provided a new way for both KGM application and CPL dehydration.     

Silk nanofibrous scaffolds assembled by natural polysaccharide konjac glucomannan

Natural silk fibroin nanofibers (SNF) have recently attracted great attention in the field of biomaterials due to their excellent biocompatibility, outstanding mechanical properties, and biomimetic nanostructures. However, the poor structural stability of SNF assembly in aqueous conditions remains a major obstacle to their biomedical application. In this work, SNF scaffolds with extracellular matrix-mimicking architecture and tunable properties were developed by using a small amount of konjac glucomannan (KGM) as a physical adhesive. Fourier transform infrared spectroscopy (FTIR) results revealed that KGM facilitated the formation of hydrogen bond networks between SNF as well as nanofibers/polysaccharide molecules, thereby reinforcing the interconnectivity between SNF. The water stability test showed that SNF scaffolds exhibited good structural stability in water when the mass ratio of KGM/SNF reached 2.5/100. Raising KGM content significantly enhanced the compression strength, modulus, and swelling ratio of the porous scaffold. Whereas, the nanofibrous morphology and porosity of the scaffolds were significantly sacrificed as KGM content exceeded 10% as evidenced by scanning electron microscopy (SEM) results. In vitro, cytocompatibility results also demonstrated the excellent biocompatibility of the biomimetic nanofibrous scaffolds, and the high porosity significantly enhanced cell viability. These results suggest that KGM-reinforced SNF scaffolds may serve as promising candidates for biomaterial applications.     

Preparation and characterization of konjac glucomannan and sodium carboxymethylcellulose blend films

The novel blend films of konjac glucomannan (KGM) and sodium carboxymethylcellulose (NaCMC) were prepared by casting the mixed polymer aqueous solutions. The physical properties of the blend films from konjac glucomannan and sodium carboxymethylcellulose were investigated by using FT‐infrared (FTIR), wide‐angle X‐ray diffraction (WAXD), differential thermal analysis (DTA), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and measurements of mechanical properties. The experimental results showed that the occurrence of the interactions between KGM and NaCMC molecular chains through hydrogen bond formation, and the physical properties of the films largely depend on the blending ratio. The thermal stability, mechanical properties of both tensile strength, and elongation at break of the blend films were improved by blending KGM with NaCMC. The surface morphology of the films observed by SEM was consistent with the results mentioned above. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 26–31, 2001     

葡甘聚糖-壳聚糖-聚乙烯醇共混膜的结构表征及性能研究

用溶液共混法制备了葡甘聚糖-壳聚糖-聚乙烯醇共混膜,并用红外光谱(FTIR)、X-射线衍射(XRD)、扫描电镜(SEM)及透光率表征了膜的结构,同时测定了共混膜的力学性能、吸水率、水蒸气透过率。结果表明:共混膜中葡甘聚糖、壳聚糖及聚乙烯醇之间存在着强烈的相互作用和良好的相容性,三者共混明显改善了纯聚合物和二元膜的性能。     

Konjac Glucomannan/Poly(vinyl alcohol)/Na+Rectorite Nanocomposite Films: Structure, Characteristic and Drug Delivery Behaviour

Konjac glucomannan(KGM)/poly(vinyl alcohol)(PVA)/Na⁺ modified rectorite (Na⁺REC) nanocomposite films were obtained by using a casting/solvent evaporation method. The structures and microstructures of KGM/PVA/Na⁺REC composite films were analyzed by FTIR, XRD, SEM and TEM. A wide variety of material characteristics for the KGM/PVA/Na⁺REC composite films were investigated, including the mechanical property, optical transmittance and thermal stability. The results revealed that by adding PVA more well-intercalative/exfoliated structure of composite film was obtained. As a result, the KGM/PVA/Na⁺REC composite film at low Na⁺REC and PVA content exhibited an improvement in mechanical properties and thermal stability due to a reinforcement effect. In vitro drug-controlled release studies showed a slower and more continuous release for KGM/PVA/Na⁺REC composite film in comparison with KGM/Na⁺REC composite film.     

Expanded Discrete Relaxation Model for Konjac Glucomannan Hydrocolloid

Rheological storage and loss moduli (G′ and G″) of a Konjac glucomannan (KGM) hydrocolloid were measured by a rheometer AR500 with variations of angular frequency and temperature at different concentrations. The results show that angular frequency sweep curves of G′ and G″ mainly looked like ascending curves on the double logarithmic diagram. Moduli versus angular frequency curves were fitted to the power law, Spriggs, and Oldroyd models with standard errors much higher than the reasonable value (about 5%), while the discrete relaxation model gave a standard error of 0.81%. On the basis of the discrete relaxation model and experimental results, expanded formulae that include the angular frequency, temperature and concentration as independent variables were proposed. The obtained result can help the designer, fabricator, and consumer in optimizing their formulation with the KGM hydrocolloid.