Carbohydrate Polymers最新文献

Formation and physical properties of skimmed milk/low-acyl gellan gum double gels: Influence of gelation sequence 脱脂奶/低酰基结冷胶双凝胶的形成和物理性质：凝胶化顺序的影响

IF 10.7 1区化学 Q1 CHEMISTRY, APPLIED

Carbohydrate Polymers

Pub Date : 2024-11-15 DOI: 10.1016/j.carbpol.2024.123012

Weibo Zhang , Chong Chen , Pengjie Wang , Jingni Xu , Feng Zhang , Jing Wang , Yinhua Zhu , Jie Luo , Liang Zhao , Fazheng Ren

Low-acyl gellan gum (LA) is a typical cold- and Ca²⁺-set gelation polysaccharide and is widely used to improve the stability of yoghurt. Acid and endogenous calcium can induce the formation of skimmed milk (SM)/LA double gels. However, the effect of acidification temperature on the formation and physical properties of SM/LA double gels has not been elucidated. In this study, temperature above and below the LA transition temperature (38 °C) were used as acidification temperatures, which adjusted the gelation sequence of SM and LA. The LA gel prior to the SM gel formed at acidification temperature of 37 °C, exhibiting the highest WHC and G′ among all samples. Moreover, SM/LA-37 double gels showed two networks: one was a porous network and the other was a dense network. By contrast, SM/LA mixtures acidified at 42 °C formed double networks during the cooling stage, and the previously formed SM gel hindered the formation of the LA gel. Consequently, SM/LA-42 double gels showed lower WHC and G′ compared with SM/LA-37 double gels. Overall, gelation sequence substantially affected the physical properties of SM/LA double gels. Our findings provide basis for adopting optimal methods to improve yoghurt quality and revealing the gelation mechanism involved in SM/LA double gels.

低酰基结冷胶（LA）是一种典型的冷凝胶和钙凝胶多糖，被广泛用于提高酸奶的稳定性。酸和内源性钙可诱导脱脂奶（SM）/LA 双凝胶的形成。然而，酸化温度对 SM/LA 双凝胶的形成和物理性质的影响尚未阐明。本研究采用高于和低于LA转变温度（38 °C）的温度作为酸化温度，以调整SM和LA的凝胶化顺序。先于SM凝胶的LA凝胶在酸化温度为37 °C时形成，在所有样品中表现出最高的WHC和G′。此外，SM/LA-37 双凝胶显示出两种网络：一种是多孔网络，另一种是致密网络。相比之下，在 42 °C 下酸化的 SM/LA 混合物在冷却阶段形成了双层网络，之前形成的 SM 凝胶阻碍了 LA 凝胶的形成。因此，与 SM/LA-37 双凝胶相比，SM/LA-42 双凝胶显示出较低的 WHC 和 G′。总之，凝胶化顺序对 SM/LA 双凝胶的物理性质有很大影响。我们的研究结果为采用最佳方法提高酸奶质量和揭示 SM/LA 双凝胶的凝胶化机制提供了依据。

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引用次数: 0

Biodegradable, robust, and conductive bacterial cellulose @PPy-P macrofibers as resistive strain sensors for smart textiles 可生物降解、坚固耐用且导电的细菌纤维素 @PPy-P 宏纤维作为智能纺织品的电阻应变传感器

IF 10.7 1区化学 Q1 CHEMISTRY, APPLIED

Carbohydrate Polymers

Pub Date : 2024-11-14 DOI: 10.1016/j.carbpol.2024.122963

Zaixian Yuan , Hai Yin , Min Zheng , Xiao Chen , Wei Peng , Hongfu Zhou , Jun Xing , Li Wang , Sanming Hu

Fiber-based resistive strain sensors have attracted significant interest in the development of smart wearable devices due to their portability, flexibility, and easy conformability. However, current fiber-based resistive strain sensors mainly composed of metals and nondegradable polymers are not environmentally friendly and have poor mechanical strength. In this work, we examined biodegradable, robust, and conductive macrofibers fabricated through the in situ polymerization of p-toluenesulfonic acid (P-TSA)-doped polypyrrole (PPy) in bacterial cellulose (BC) nanofibers using wet-stretching and wet-twisting methods. The BC/PPy-P macrofibers possessed excellent conductivity (~7.19 S/cm), with superior mechanical properties (~210 MPa tensile strength and 2 GPa Young's modulus). Importantly, the BC/PPy-P microfiber operating as a resistive strain sensor possessed fast response time (15 s) and long-term stability (up to 1000 cycles), which could be used to effectively detect human movements. Moreover, the matrix material BC of BC/PPy-P macrofibers could be completely degraded within 96 h in the cellulase solution, leaving only PPy-P particles that could be recycled for other use. Therefore, the prepared BC/PPy-P microfibers provided a promising strategy for developing green resistive strain sensing fibers, with great potential to design eco-friendly smart fabric for monitoring human movements.

纤维电阻式应变传感器因其便携性、灵活性和易适配性，在智能可穿戴设备的开发中引起了极大的兴趣。然而，目前主要由金属和不可降解聚合物组成的纤维电阻应变传感器并不环保，而且机械强度较差。在这项工作中，我们采用湿拉伸和湿扭转方法，研究了对甲苯磺酸（P-TSA）掺杂聚吡咯（PPy）在细菌纤维素（BC）纳米纤维中原位聚合而制成的可生物降解、坚固且导电的大纤维。BC/PPy-P大纤维具有优异的导电性（约7.19 S/cm）和机械性能（约210兆帕抗拉强度和2吉帕杨氏模量）。重要的是，用作电阻应变传感器的 BC/PPy-P 微纤维具有快速响应时间（15 秒）和长期稳定性（最多 1000 次循环），可用于有效检测人体运动。此外，BC/PPy-P 大纤维的基体材料 BC 在纤维素酶溶液中可在 96 小时内完全降解，只留下 PPy-P 颗粒，可回收再利用。因此，所制备的 BC/PPy-P 微纤维为开发绿色电阻应变传感纤维提供了一种前景广阔的策略，在设计用于监测人体运动的环保型智能织物方面具有巨大潜力。

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引用次数: 0

Synthesis and characterization of interpenetrating network hydrogels based on sugar beet pectin and heteroprotein complex: Structural characteristics and physicochemical properties 基于甜菜果胶和杂蛋白复合物的互穿网络水凝胶的合成与表征：结构特征与理化性质

IF 10.7 1区化学 Q1 CHEMISTRY, APPLIED

Carbohydrate Polymers

Pub Date : 2024-11-14 DOI: 10.1016/j.carbpol.2024.122959

Lijia Li, Yue Liu, Xiangyun Tan, Fei Teng, Yang Li

Hydrogels made from natural polymers have excellent application potential due to their good biocompatibility. However, it is difficult to maximise the benefits of hydrogels when the gel network is formed by a single substance. The purpose of this study was to investigate the relationship between the interaction of modified soybean lipophilic proteins (SLP) and lysozyme (LY) and the formation of heteroprotein complexes. Subsequently, interpenetrating network (IPN) hydrogels were further synthesized on the basis of heteroprotein (HP) complexes and sugar beet pectin (SBP) as the backbone. The strong interaction between SLP and LY drove them to spontaneously form heteroprotein complexes. The HP-SBP IPN imparted good mechanical properties to the hydrogel, which could withstand a maximum pressure of 7500 pa at 88 % strain. Meanwhile, there was still 93.52 % of water being trapped in IPN after freeze-thawing. The HP-SBP IPN hydrogels could effectively protect the encapsulated substance during UV irradiation and maintain its morphology after undergoing dynamic pH changes. Furthermore, the HP-SBP IPN hydrogels could regulate their release ability through their own swelling and achieved more than 88 % release rate in simulated intestinal fluid. Therefore, this study was expected to provide a potential strategy for the synthesis of IPN hydrogels.

天然聚合物制成的水凝胶具有良好的生物相容性，因此具有极佳的应用潜力。然而，当凝胶网络由单一物质形成时，很难最大限度地发挥水凝胶的优势。本研究旨在探讨改性大豆亲脂性蛋白（SLP）和溶菌酶（LY）的相互作用与异种蛋白复合物形成之间的关系。随后，以异性蛋白（HP）复合物为基础，甜菜果胶（SBP）为骨架，进一步合成了互穿网络（IPN）水凝胶。SLP 和 LY 之间的强相互作用促使它们自发形成异种蛋白复合物。HP-SBP IPN 为水凝胶带来了良好的机械性能，在应变为 88% 的情况下可承受 7500 pa 的最大压力。同时，冻融后仍有 93.52% 的水分滞留在 IPN 中。HP-SBP IPN 水凝胶能在紫外线照射下有效保护封装物质，并在经历动态 pH 值变化后保持其形态。此外，HP-SBP IPN 水凝胶还能通过自身溶胀调节释放能力，在模拟肠液中的释放率超过 88%。因此，这项研究有望为 IPN 水凝胶的合成提供一种潜在的策略。

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引用次数: 0

Antibacterial chitosan/organic rectorite nanocomposite-conjugated gelatin/β-cyclodextrin hydrogels with improved hemostasis performance for wound repair 具有更好止血性能的抗菌壳聚糖/有机雷克托石纳米复合-共轭明胶/β-环糊精水凝胶用于伤口修复

IF 10.7 1区化学 Q1 CHEMISTRY, APPLIED

Carbohydrate Polymers

Pub Date : 2024-11-13 DOI: 10.1016/j.carbpol.2024.122961

Rong Huang , Yongqian Bian , Wenxuan Wang , Lirong Xu, Hao Zhang, Haowei Zhou, Jincheng Du, Jiaqi Li, Yuheng Zhang, Xueyong Li, Jing Li

Bacterial infections and severe bleeding continue to pose significant challenges in wound repair. There is an urgent need for innovative, nature-inspired hydrogel dressings with antibacterial and hemostatic properties. A Ge-β-CD-CS-OREC conjugate hydrogel was developed by grafting β-CD and CS-OREC nanocomposites into a Ge matrix using EDC/NHS crosslinking, as confirmed by FT-IR and EDX analyses. Compared to single Ge-β-CD cross-linked hydrogels, the addition of CS-OREC enhanced the hydrogel's properties, including increased pore size (60 ± 14 μm), improved wettability (WCA = 28.82 ± 0.6°), enhanced tensile strength (41.3 ± 3.56 KPa), and strong tissue adhesion. Furthermore, this hydrogel demonstrated excellent cytocompatibility when co-cultured with keratinocytes (Kcs) and vascular endothelial cells (VECs). The incorporation of CS chains into OREC interlayers allowed the hydrogel to specifically target bacteria and increase membrane permeability in Pseudomonas aeruginosa (PA), Klebsiella pneumoniae (KP), and Staphylococcus aureus (SA), effectively reducing the bacterial load in infected wounds by 50.24–73.92 % compared to controls in vivo. Further, the hydrogel exhibited superior hemostatic efficiency (78 ± 10 s) over commercial gauze and other gels by enhancing platelet activation and coagulation factor secretion. The hydrogel accelerated tissue regeneration by promoting epithelial maturation and blood vessel regeneration, indicating its clinical potential as promising wound dressing.

细菌感染和严重出血仍然是伤口修复的重大挑战。目前迫切需要具有抗菌和止血特性的创新型自然启发水凝胶敷料。通过使用 EDC/NHS 交联法将 β-CD 和 CS-OREC 纳米复合材料接枝到 Ge 基质中，开发出了 Ge-β-CD-CS-OREC 共轭水凝胶，并通过傅立叶变换红外光谱（FT-IR）和乙二胺四乙酸氧化物（EDX）分析证实了这一点。与单一的 Ge-β-CD 交联水凝胶相比，CS-OREC 的加入增强了水凝胶的性能，包括增加了孔径（60 ± 14 μm）、改善了润湿性（WCA = 28.82 ± 0.6°）、提高了拉伸强度（41.3 ± 3.56 KPa）和较强的组织粘附性。此外，这种水凝胶在与角质细胞（Kcs）和血管内皮细胞（VECs）共培养时表现出了良好的细胞相容性。在 OREC 夹层中加入 CS 链后，水凝胶就能特异性地靶向细菌，并增加铜绿假单胞菌（PA）、肺炎克雷伯氏菌（KP）和金黄色葡萄球菌（SA）的膜渗透性，与体内对照组相比，能有效减少感染伤口中的细菌量 50.24-73.92%。此外，与商用纱布和其他凝胶相比，水凝胶通过增强血小板活化和凝血因子分泌，表现出更高的止血效率（78 ± 10 秒）。水凝胶可促进上皮成熟和血管再生，从而加速组织再生，这表明它具有作为伤口敷料的临床潜力。

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引用次数: 0

Sheet-laminated additive manufacturing of bacterial cellulose nanofiber-reinforced hydrogels 细菌纤维素纳米纤维增强水凝胶的片状层压添加制造

IF 10.7 1区化学 Q1 CHEMISTRY, APPLIED

Carbohydrate Polymers

Pub Date : 2024-11-13 DOI: 10.1016/j.carbpol.2024.122972

Junsik Choi , Kiho Sung , Jinho Hyun , Sungchul Shin

Three-dimensional (3D) printing of hydrogels offers promising potential for creating intricate, customizable structures with superior elasticity, softness, and biocompatibility. However, due to their high-water content, hydrogels often suffer from reduced mechanical strength, which is further decreased when they absorb water, limiting their use in environments requiring high mechanical durability. To address this, we developed a novel 3D printing technique to fabricate bacterial cellulose (BC) nanofiber-reinforced hydrogels, which we term sheet-laminated additive manufacturing (SLAM). SLAM is based on digital light processing (DLP) 3D printing technology and involves a process of sequentially layering BC nanofiber sheets impregnated with a photocrosslinkable monomer. The BC nanofiber sheets provide a unique 3D network, resulting in a significant enhancement of the mechanical strength of various photocrosslinkable hydrogels. A unique aspect of BC sheets is their ability to further improve mechanical properties by inducing nanofiber alignment or adjusting nanofiber density through stretching and compression pretreatments. The printed BC nanofiber-reinforced hydrogels maintained their strength after swelling and demonstrated exceptional performance in applications requiring high mechanical robustness. Our SLAM approach successfully created complex 3D structures, such as BC-reinforced hydrogel earthworm structures and pressure sensors, demonstrating its potential for advanced applications in high-stress environments.

水凝胶的三维（3D）打印技术为创造具有卓越弹性、柔软性和生物兼容性的复杂定制结构提供了广阔的前景。然而，由于水凝胶含水量高，其机械强度通常会降低，吸水后强度会进一步降低，从而限制了其在要求高机械耐久性的环境中的应用。为了解决这个问题，我们开发了一种新型三维打印技术来制造细菌纤维素（BC）纳米纤维增强水凝胶，我们称之为片状层压增材制造（SLAM）。SLAM以数字光处理（DLP）三维打印技术为基础，包括将浸渍了光交联单体的BC纳米纤维片按顺序分层的过程。BC纳米纤维片提供了独特的三维网络，从而显著增强了各种光交联水凝胶的机械强度。BC片材的一个独特之处在于它能够通过拉伸和压缩预处理诱导纳米纤维排列或调整纳米纤维密度，从而进一步提高机械性能。打印出的 BC 纳米纤维增强水凝胶在溶胀后仍能保持强度，在要求高机械坚固性的应用中表现出卓越的性能。我们的 SLAM 方法成功创建了复杂的三维结构，如 BC 增强水凝胶蚯蚓结构和压力传感器，证明了其在高压力环境中的先进应用潜力。

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引用次数: 0

Structural and physicochemical properties of corn starch modified by phosphorylase b, hexokinase and alkaline phosphatase 经磷酸化酶 b、己糖激酶和碱性磷酸酶改性的玉米淀粉的结构和理化特性

IF 10.7 1区化学 Q1 CHEMISTRY, APPLIED

Carbohydrate Polymers

Pub Date : 2024-11-13 DOI: 10.1016/j.carbpol.2024.122979

Shuo Sun , Dengyue Sun , Li Guo , Bo Cui , Feixue Zou , Jinpeng Wang , Chunrui Sun , Yu Zhu , Xueling Li

To improve the functional properties of corn starch, phosphorylase b (PB), hexokinase (HK), and alkaline phosphatase (AP) were used to produce enzyme-modified starches (PBMS, HKMS, and APMS). The results showed that enzyme-modified starches had different phosphorus contents and degrees of substitution. The presence of PO bonds and P-O-C bonds further demonstrated that phosphate groups were grafted into starch. The proportions of monostarch phosphate in PBMS, HKMS, and APMS were 77.05 %, 79.33 % and 85.88 %, respectively. The introduction of phosphate groups affected the functional properties of starch. The swelling powers of PBMS, HKMS and APMS increased from 0.99 % to 12.86 %, 10.83 % and 5.95 %, respectively. Compared to native starch (1820 mPa·s), the peak viscosities of PBMS, HKMS and APMS increased to 2655, 2838, and 2021 mPa·s, respectively. Meanwhile, the introduction of phosphate groups endowed phosphorylated starch with better freeze-thaw stability, larger paste transparency, higher solubility, and slower retrogradation rate.

为了改善玉米淀粉的功能特性，使用磷酸化酶 b（PB）、己糖激酶（HK）和碱性磷酸酶（AP）来生产酶改性淀粉（PBMS、HKMS 和 APMS）。结果表明，酶改性淀粉具有不同的磷含量和取代度。PO 键和 P-O-C 键的存在进一步证明磷酸基团已接枝到淀粉中。单淀粉磷酸在 PBMS、HKMS 和 APMS 中的比例分别为 77.05%、79.33% 和 85.88%。磷酸基团的引入影响了淀粉的功能特性。PBMS、HKMS 和 APMS 的膨胀率分别从 0.99 % 增加到 12.86 %、10.83 % 和 5.95 %。与原生淀粉（1820 mPa-s）相比，PBMS、HKMS 和 APMS 的峰值粘度分别增加到 2655、2838 和 2021 mPa-s。同时，磷酸基团的引入使磷酸化淀粉具有更好的冻融稳定性、更大的糊状透明度、更高的可溶性和更慢的逆降解速率。

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引用次数: 0

Intervention mechanism of amphiphilic natural sweeteners on starch chain dynamic behavior: Computational and experimental insights 两亲性天然甜味剂对淀粉链动态行为的干预机制：计算和实验见解

IF 10.7 1区化学 Q1 CHEMISTRY, APPLIED

Carbohydrate Polymers

Pub Date : 2024-11-12 DOI: 10.1016/j.carbpol.2024.122978

Fan Wang, Jianfu Shen, Baiyi Lu

Amphiphilic natural sweeteners (i.e. steviol glycosides (STE) and glycyrrhizic acid (GA)) have been adopted to improve the quality of various starchy products, which can fundamentally be characterized as the intervention of the former in the chain dynamic behavior of the latter. However, these phenomena and related mechanisms still lack systematic insights. Herein, dual-temperature molecular dynamic simulations combined with experimental analysis were used to tandemly investigate the intervention of sweeteners in six types of chain dynamic behaviors that are strongly correlated with starch properties, including unwinding, movement, long/short-term reassociation, rearrangement, and depolymerization. The results show that STE and GA both promoted the chain unwinding and movement, and also retarded the chain short/long-term reassociation and rearrangement. Besides, GA exhibited a greater role than STE in facilitating chain unwinding and movement. Peculiarly, GA (0 %–40 % w/w) collaborated with starch to form a new microstructure, especially at high content (≥ 20 % w/w), which endowed starch with exceptionally high hardness (15.50 gf→189.36 gf) and hardening rate (2.72 gf/d→17.76 gf/d), and also placed a physical barrier to retard starch depolymerization (slowly digestible starch: 11.26 %→20.62 %). This work contributes data and theoretical support for the development of starch/amphiphilic natural sweetener composite matrices.

两亲性天然甜味剂（即甜菊糖苷（STE）和甘草酸（GA））已被用于改善各种淀粉产品的质量，其基本特征是前者对后者链动态行为的干预。然而，这些现象及相关机制仍缺乏系统的深入研究。本文采用双温分子动力学模拟结合实验分析的方法，串联研究了甜味剂对六种与淀粉特性密切相关的链动力学行为的干预，包括解卷、移动、长短期重联、重排和解聚。结果表明，STE 和 GA 都能促进淀粉链的开卷和移动，同时也能延缓淀粉链的长短期重新结合和重新排列。此外，在促进链的松解和移动方面，GA 的作用比 STE 更大。特别的是，GA（0 %-40 % w/w）与淀粉共同形成了一种新的微观结构，尤其是在高含量（≥ 20 % w/w）时，它赋予了淀粉极高的硬度（15.50 gf→189.36 gf）和硬化率（2.72 gf/d→17.76 gf/d），同时也为延缓淀粉解聚提供了物理屏障（慢消化淀粉：11.26 %→20.62 %）。这项研究为淀粉/亲水天然甜味剂复合基质的开发提供了数据和理论支持。

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引用次数: 0

PVA-enhanced green synthesis of CMC-based lithium adsorption films PVA 增强型 CMC 基锂吸附薄膜的绿色合成

IF 10.7 1区化学 Q1 CHEMISTRY, APPLIED

Carbohydrate Polymers

Pub Date : 2024-11-12 DOI: 10.1016/j.carbpol.2024.122973

Shengkai Liu , Huiling Li , Xi Li , Wei Wang , Chunguang Rong , Mengjie Yang , Yonggui Wang , Jing Wang , Yabei Xu , Daxin Liang , Yanjun Xie

The titanium-based lithium ion sieve (HTO), renowned for its exceptional adsorption performance and cyclic stability, was utilized in addressing the global shortage of lithium resources. However, the recovery and reuse efficiency of HTO in powder form is relatively low, which limits its application in industrial fields. To address this issue, this study utilized carboxymethyl cellulose (CMC) as the principal matrix material, while polyvinyl alcohol (PVA) played a dual function as both matrix and crosslinker, negating the necessity for supplementary crosslinking materials. Employing water as the only solvent, HTO was embedded into the CMC-PVA blended film matrix. It was observed that augmenting the CMC content substantially elevates the adsorptive capability of the film. However, this enhancement comes at the cost of reduced mechanical robustness and diminished stability in solution. Consequently, by balancing the influence of adsorptive capacity and stability through fine-tuning the CMC-to-PVA ratio. Even when HTO powder is encapsulated within the film, the adsorption film retains the excellent adsorption properties of HTO, achieving an adsorption capacity for lithium of 29.21 mg g⁻¹ within 12 h. This study provides an innovative pathway and ideas for the large-scale, low-cost production of sustainable lithium-ion adsorption materials.

钛基锂离子筛（HTO）以其优异的吸附性能和周期稳定性而闻名，被用于解决全球锂资源短缺的问题。然而，粉末状 HTO 的回收和再利用效率相对较低，限制了其在工业领域的应用。为解决这一问题，本研究采用羧甲基纤维素（CMC）作为主要基体材料，而聚乙烯醇（PVA）则兼具基体和交联剂的双重功能，无需使用辅助交联材料。以水为唯一溶剂，将 HTO 嵌入 CMC-PVA 混合薄膜基质中。观察发现，增加 CMC 含量可大幅提高薄膜的吸附能力。然而，这种提高是以降低机械坚固性和溶液稳定性为代价的。因此，需要通过微调 CMC 与 PVA 的比例来平衡吸附能力和稳定性的影响。该研究为大规模、低成本生产可持续锂离子吸附材料提供了创新途径和思路。

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引用次数: 0

Mucoadhesive polyelectrolyte complexes of fucoidan and chitin nanowhiskers to prolong the antiprotozoal activity of metronidazole 褐藻糖胶和甲壳素纳米须的黏附性聚电解质复合物延长甲硝唑的抗原虫活性

IF 10.7 1区化学 Q1 CHEMISTRY, APPLIED

Carbohydrate Polymers

Pub Date : 2024-11-12 DOI: 10.1016/j.carbpol.2024.122975

Natallia V. Dubashynskaya , Valentina A. Petrova , Irina S. Ustyukhina , Andrey V. Sgibnev , Yuliya I. Cherkasova , Yuliya A. Nashchekina , Elena N. Vlasova , Dmitry P. Romanov , Yury A. Skorik

The improvement of the specific pharmacological activity of agents with antimicrobial and antiprotozoal properties (e.g. metronidazole, MET) is of interest for clinical applications in the treatment of bacterial infections. In this work, we prepared the polyelectrolyte complexes (PEC) based on chitin nanowhiskers (CNW) and fucoidan (FUC) with hydrodynamic diameters of 244 and 816 nm, a ζ-potential of about −22 mV and good mucoadhesive properties. The incorporation of MET into PEC particles promoted the sustained release of MET for 10 h and maintained the antiprotozoal activity against clinical isolates of Trichomonas vaginalis for up to 10 h. At concentrations of 1–3 mg/mL, the CWN-FUC-MET particles showed no cytotoxicity (HeLa cell line). The sustained drug release rate, combined with pronounced mucoadhesive properties, improved pharmacological activity, and non-cytotoxicity makes the developed biopolymer delivery systems promising candidates for further clinical trials.

提高具有抗菌和抗原虫特性的制剂（如甲硝唑，MET）的特异性药理活性是临床应用于治疗细菌感染的兴趣所在。在这项工作中，我们制备了基于甲壳素纳米须（CNW）和褐藻糖胶（FUC）的聚电解质复合物（PEC），其水动力直径分别为 244 纳米和 816 纳米，ζ电位约为 -22 mV，具有良好的粘附性。将 MET 加入 PEC 粒子可促进 MET 的持续释放长达 10 小时，对临床分离的阴道毛滴虫的抗原虫活性可维持长达 10 小时。持续的药物释放率、明显的粘附性、更高的药理活性和无细胞毒性使得所开发的生物聚合物给药系统有望进一步用于临床试验。

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引用次数: 0

Research on the dielectric properties of flexible β-CD/PVDF all-organic films 柔性 β-CD/PVDF 全有机薄膜的介电性能研究

IF 10.7 1区化学 Q1 CHEMISTRY, APPLIED

Carbohydrate Polymers

Pub Date : 2024-11-10 DOI: 10.1016/j.carbpol.2024.122968

Ming Wang , Hongwei Lu , Bengang Li , Shijia Yang , Weitao Su

All-organic dielectric polymers are currently a hot topic in the study of dielectric materials. However, it is still challenging to improve the dielectric constant, breakdown strength, and energy storage density of materials simultaneously. This study used PVDF as the matrix, and β-CD/PVDF all-organic composite dielectric films were prepared using a solution blending method. The research found that after the introduction of β-Cyclodextrin (β-CD), the β-phase content of the polymer and the crystallinity of the films were 40.9 % and 48.96 %, respectively, which are 1.1 and 1.4 times that of pure PVDF. Improved microstructure significantly enhanced the dielectric performance and energy density of the composite films with β-CD. The composite films with β-CD with dielectric constant (ε_r), breakdown strength (E_b), and energy density reaching 12.35, 401.7 MV/m, and 6.11 J/cm³, respectively, which are 1.38, 1.1, and 1.3 times that of pure PVDF. This method provides a new pathway for preparing all-organic dielectric films with high dielectric constant, high breakdown strength, and high energy density.

全有机介电聚合物是目前介电材料研究的热门话题。然而，如何同时提高材料的介电常数、击穿强度和储能密度仍是一项挑战。本研究以 PVDF 为基体，采用溶液共混法制备了 β-CD/PVDF 全有机复合介质薄膜。研究发现，引入β-环糊精（β-CD）后，聚合物的β相含量和薄膜的结晶度分别为 40.9 % 和 48.96 %，是纯 PVDF 的 1.1 倍和 1.4 倍。微观结构的改善大大提高了β-CD 复合薄膜的介电性能和能量密度。β-CD复合薄膜的介电常数（εr）、击穿强度（Eb）和能量密度分别达到了12.35、401.7 MV/m和6.11 J/cm3，是纯PVDF的1.38、1.1和1.3倍。该方法为制备具有高介电常数、高击穿强度和高能量密度的全有机介质薄膜提供了一条新途径。

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