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Extraction of high-quality moso bamboo fibers by enzyme/alkali synergistic mechanism 利用酶/碱协同机制提取优质毛竹纤维。
IF 7.7 1区 化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2024-11-02 DOI: 10.1016/j.ijbiomac.2024.137230
As an emerging non-wood resource, moso bamboo has attracted extensive attention because of its short growth cycle and high holocellulose content. However, the internal structure of moso bamboo is more compact than that of wood, leading to higher chemical consumption during the pulping process, which greatly reduces the quality of the extracted fibers. Herein, an innovative pulping system including enzymes and alkali is proposed to achieve higher-quality extraction of moso bamboo fibers. Benefiting from the synergistic effects of high-temperature and alkali-resistant cellulase, xylanase, and laccase, supplemented with alkaline pulping, adequate retention and softening of moso bamboo fibers were ultimately achieved. The sample treated with an enzyme/alkali system resulted in a relative increase in fiber length of 7.19 % and a 31.26 % increase in beating efficiency over alkaline pulping. In addition, the tensile index and tearing index of the paper treated with the enzyme/alkali system reached 50.17 N·m·g−1 and 9.12 mN·m2·g−1, which were 22.52 % and 20.53 % higher than those of the alkaline pulping, respectively. This work provides new insights into the production of high-performance moso bamboo fibers and paper with low energy and alkali consumption.
作为一种新兴的非木材资源,毛竹因其生长周期短、全纤维素含量高而受到广泛关注。然而,毛竹的内部结构比木材更为紧密,导致制浆过程中的化学消耗较高,从而大大降低了提取纤维的质量。本文提出了一种包括酶和碱的创新制浆系统,以实现更高质量的毛竹纤维提取。受益于耐高温耐碱纤维素酶、木聚糖酶和漆酶的协同作用,再辅以碱性制浆,最终实现了毛竹纤维的充分保留和软化。与碱性制浆相比,用酶/碱系统处理的样品纤维长度相对增加了 7.19%,打浆效率提高了 31.26%。此外,经酶/碱系统处理的纸张的抗张指数和撕裂指数分别达到 50.17 N-m-g-1 和 9.12 mN-m2-g-1,比碱性制浆分别高出 22.52 % 和 20.53 %。这项工作为低能耗和低碱耗生产高性能毛竹纤维和纸张提供了新的见解。
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引用次数: 0
An electrostatically spun cellulose-based self-powered mask with high efficiency air filtration and ammonia sensing 一种基于静电纺丝纤维素的自供电口罩,具有高效空气过滤和氨感应功能。
IF 7.7 1区 化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2024-11-02 DOI: 10.1016/j.ijbiomac.2024.137226
On construction sites impacted by particulate matter and hazardous gases, portable integrated air filtration equipment with high efficiency, minimal pressure drops and ammonia (NH3) alarms is critical. Triboelectric nanogenerators (TENG) present a sustainable solution by generating self-powered electricity to fulfill these requirements. In this study, we synthesized zeolitic imidazolate framework-8 (ZIF-8) in situ on the surface of titanium carbide (Ti3C2Tx) to create Ti3C2Tx/ZIF-8, grafted it onto cellulose diacetate via tetraethyl orthosilicate, and ultimately developed a cellulose-based nanofibrous membrane through electrospinning, combining it with a negative triboelectric material to construct a self-powered TENG-based mask. The device achieved a balance between a low pressure drop (61 Pa) and high filtration efficiency (99.21 %, 99.71 %, and 99.98 % for PM0.3, PM0.5, and PM1, respectively). Furthermore, the device responds swiftly to NH3; at a concentration of 100 ppm NH3, it achieves a rapid response rate of 83 %, with a response/recovery time as low as 12/14 s. Notably, the device retains its rapid sterilization capability within a short duration (20 min) and demonstrates remarkable stability across its various performance metrics, even after multiple washes. This study presents a novel approach to the development of multi-use, self-powered wearable devices featuring excellent air filtration performance and NH3 detection capabilities.
在受颗粒物和有害气体影响的建筑工地上,具有高效率、最小压降和氨气(NH3)报警功能的便携式集成空气过滤设备至关重要。三电纳米发电机(TENG)通过产生自供电来满足这些要求,是一种可持续的解决方案。在这项研究中,我们在碳化钛(Ti3C2Tx)表面原位合成了沸石咪唑酸框架-8(ZIF-8),形成了 Ti3C2Tx/ZIF-8,并通过正硅酸四乙酯将其接枝到二醋酸纤维素上,最终通过电纺丝技术开发出纤维素基纳米纤维膜,并将其与负三电材料相结合,构建了基于 TENG 的自供电掩膜。该装置实现了低压降(61 Pa)和高过滤效率(对 PM0.3、PM0.5 和 PM1 的过滤效率分别为 99.21 %、99.71 % 和 99.98 %)之间的平衡。此外,该设备对 NH3 的响应速度很快;在 NH3 浓度为 100 ppm 时,其快速响应率达到 83%,响应/恢复时间低至 12/14 秒。值得注意的是,该装置能在短时间内(20 分钟)保持快速灭菌能力,即使经过多次洗涤,其各项性能指标也表现出显著的稳定性。这项研究为开发具有出色空气过滤性能和 NH3 检测能力的多用途自供电可穿戴设备提供了一种新方法。
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引用次数: 0
Engineering of a bilayer antibacterial wound dressing from bovine pericardium and electrospun chitosan/PVA/antibiotics for infectious skin wounds management: An in vitro and in vivo study. 用牛心包和电纺壳聚糖/PVA/抗生素制成双层抗菌伤口敷料,用于感染性皮肤伤口的处理:体外和体内研究。
IF 7.7 1区 化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2024-11-02 DOI: 10.1016/j.ijbiomac.2024.137055
Sanaz Alizadeh, Modara Nasiri, Navid Farahmandian, Paniz Farshi, Zahra Aliakbar Ahovan, Jila Majidi, Ali Hashemi, Sasha H Shafikhani, Lorenzo Moroni, Mazaher Gholipourmalekabadi

Tissue deterioration and post-injury infections are the primary cause of skin diseases. Tissue engineering has developed various synthetic and natural polymers to generate bioactive scaffolds that can closely replicate the natural extracellular matrix (ECM). Decellularized tissues have emerged as a potential solution for reconstructing cutaneous lesions due to their ability to preserve the intricate protein structure and provide essential functional domains for cellular differentiation. In this study, we selected bovine pericardium and subjected it to diverse decellularization methods to optimize ECM preservation. Polyvinyl alcohol (PVA)/chitosan (CS) infused with two clinically important antibiotics (colistin and meropenem) was directly electrospun onto the decellularized bovine pericardium (DBPS) to endow the dual-layer scaffold (DBPS-Abs) an antibacterial property. Both DBPS-Abs and DBPS demonstrated a consistent 3D microstructure with interlinked pore networks, minimal degradation, and robust mechanical stability. The DBPS-Abs group exhibited a potent antibacterial effect against standard and clinical strains of Escherichia coli. Moreover, implanting the constructs into full-thickness skin wounds in mice confirmed enhanced wound regeneration in cases treated with DBPS-Abs compared to other groups, observed over a 7- and 21-day post-implantation period. These findings highlight DBPS-Abs as a superior antibacterial wound dressing, requiring further clinical evaluations.

组织退化和损伤后感染是皮肤病的主要原因。组织工程学已开发出各种合成和天然聚合物,用于生成生物活性支架,可近似复制天然细胞外基质(ECM)。脱细胞组织能够保留复杂的蛋白质结构,并为细胞分化提供重要的功能域,因此已成为重建皮肤病变的潜在解决方案。在这项研究中,我们选择了牛心包,并对其进行了不同的脱细胞处理,以优化 ECM 的保存。在脱细胞牛心包(DBPS)上直接电纺注入两种临床上重要抗生素(可乐定和美罗培南)的聚乙烯醇(PVA)/壳聚糖(CS),以赋予双层支架(DBPS-Abs)抗菌特性。DBPS-Abs 和 DBPS 均表现出一致的三维微观结构,具有相互连接的孔隙网络、最小降解和强大的机械稳定性。DBPS-Abs 组对标准和临床大肠杆菌菌株具有很强的抗菌效果。此外,将构建体植入小鼠的全厚皮肤伤口后证实,与其他组相比,使用 DBPS-Abs 处理的小鼠在植入后 7 天和 21 天内的伤口再生能力更强。这些发现突出表明 DBPS-Abs 是一种优质的抗菌伤口敷料,需要进一步的临床评估。
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引用次数: 0
Blueberry extract loaded into rice milk/alginate-based hydrogels as pH-sensitive systems to monitor the freshness of minced chicken 将蓝莓提取物载入米浆/海藻酸盐水凝胶作为 pH 值敏感系统,用于监测碎鸡肉的新鲜度。
IF 7.7 1区 化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2024-11-02 DOI: 10.1016/j.ijbiomac.2024.137210
Hydrogel beads from rice milk and blueberry (BB) skins were fabricated as novel bio-based pH-sensitive devices. The encapsulation of BB into rice milk/alginate beads was achieved through a simple methodology. The colourimetric response of beads in different pH media was evaluated along with the proof of reusability, showing appropriate reversibility. The evaluation of the stability of BB-loaded beads in accelerated ageing conditions (4, 25 and 40 °C and under visible/UV light) showed high stability of beads (up to 28 days) even in the presence of harsh conditions. The half-time of cyanidin-3-glucoside decreases at high temperatures and under UV light exposure. The sensitivity to ammonia (NH3) and trimethylamine (TMA), as main spoilage volatiles of protein food products, was evaluated. The detection limits (LOD) for NH3 and TMA were 22.4 ppm and 72.1 ppm, respectively. Finally, the hydrogel beads were applied to monitor the spoilage of minced chicken breast. The colour of the beads, changing from dark reddish to green/yellowish and indicative of a high level of amine, could be detected by the naked eye after 3–5 days. This research proposes a sustainable, low-cost, and simple method to fabricate BB-loaded hydrogel beads as a promising tool for intelligent packaging applications.
以米浆和蓝莓(BB)皮为原料,制备了水凝胶珠,作为新型生物基 pH 敏感器件。通过简单的方法将蓝莓皮封装到米乳/精氨酸珠中。评估了珠子在不同 pH 介质中的比色反应,并证明其可重复使用,显示出适当的可逆性。在加速老化条件(4、25 和 40 °C,以及可见光/紫外线)下对负载 BB 的微珠的稳定性进行了评估,结果表明,即使在苛刻的条件下,微珠也具有很高的稳定性(长达 28 天)。在高温和紫外线照射下,青花素-3-葡萄糖苷的半衰期会缩短。对蛋白质食品的主要腐败挥发物氨(NH3)和三甲胺(TMA)的敏感性进行了评估。NH3 和 TMA 的检测限(LOD)分别为 22.4 ppm 和 72.1 ppm。最后,水凝胶珠被用于监测碎鸡胸肉的腐败情况。3-5 天后,肉眼可检测到珠子的颜色从深红色变为绿色/淡黄色,表明胺含量较高。这项研究提出了一种可持续的、低成本的、简单的方法来制造负载 BB 的水凝胶珠,作为智能包装应用的一种有前途的工具。
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引用次数: 0
Co-doped Zr-UiO-66-NH2@carboxylated cellulose nanocrystals/PAN membrane for oil/water separation with photocatalysis-PMS synergistic self-cleaning and antibacterial activity 共掺杂 Zr-UiO-66-NH2@ 羧基纤维素纳米晶/PAN 膜用于油/水分离,具有光催化-PMS 协同自清洁和抗菌活性。
IF 7.7 1区 化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2024-11-02 DOI: 10.1016/j.ijbiomac.2024.137158
The development of superwetting membranes is a promising approach for separating emulsified oily wastewater. However, challenges such as low flux without external pressure and membrane fouling have hindered membrane performance. Herein, we fabricated a novel nanofibrous membrane by grafting Co-doped Zr-UiO-66-NH2 (UiO(Zr/Co)) nanoparticles onto carboxylated cellulose nanocrystals (CCNC)-polyacrylonitrile (PAN) mixed matrix electrospinning membrane via chemical bonds through EDC/NHS reaction. CCNC served a dual purpose by enhancing membrane hydrophilicity and providing connection points for UiO(Zr/Co). The as-prepared UiO(Zr/Co)@CCNC/PAN exhibited superhydrophilic/underwater superoleophobic and anti-fouling properties. The membrane demonstrated excellent demulsification and gravity-driven separation capabilities for various oil-in-water emulsions, with superior permeation flux (1588–2557 L m−2 h−1) and separation efficiency (above 99 %). Furthermore, UiO (Zr/Co)@CCNC/PAN could activate peroxomonosulfate (PMS) under visible light to remove both high viscous crude oil-fouling and bio-fouling, exhibiting impressive photocatalytic self-cleaning and antibacterial activity. The generation of reactive radicals (O2, OH and SO4) and non-radical (1O2) species in UiO(Zr/Co)@CCNC/PAN+PMS system through multiple pathways was confirmed. Additionally, the band structure of UiO(Zr/Co) and synergistic photocatalytic-PMS activation mechanism were investigated. This work provides new insights into the design and fabrication of MOF modified superwetting nanofibrous membrane with inherent bonding, high permeation flux, anti-fouling and self-cleaning properties.
超润湿膜的开发是分离乳化含油废水的一种前景广阔的方法。然而,无外压低通量和膜堵塞等挑战阻碍了膜的性能。在此,我们通过 EDC/NHS 反应将掺 Co 的 Zr-UiO-66-NH2 (UiO(Zr/Co))纳米粒子接枝到羧基纤维素纳米晶(CCNC)-聚丙烯腈(PAN)混合基质电纺丝膜上,从而制造出一种新型纳米纤维膜。CCNC 具有双重作用,既能增强膜的亲水性,又能为 UiO(Zr/Co)提供连接点。制备的 UiO(Zr/Co)@CCNC/PAN 具有超亲水/水下超疏水性和防污特性。该膜对各种水包油型乳状液具有出色的破乳化和重力驱动分离能力,渗透通量(1588-2557 L m-2 h-1)和分离效率(99 % 以上)均很高。此外,UiO (Zr/Co)@CCNC/PAN 还能在可见光下激活硫酸过氧单胞菌(PMS),去除高粘度原油污垢和生物污垢,表现出令人印象深刻的光催化自清洁和抗菌活性。研究证实,UiO(Zr/Co)@CCCNC/PAN+PMS 系统通过多种途径生成活性自由基(O2-、OH 和 SO4-)和非自由基(1O2)。此外,还研究了 UiO(Zr/Co)的能带结构和协同光催化-PMS 激活机制。这项工作为设计和制造具有固有粘结、高渗透通量、防污和自清洁性能的 MOF 改性超润湿纳米纤维膜提供了新的见解。
{"title":"Co-doped Zr-UiO-66-NH2@carboxylated cellulose nanocrystals/PAN membrane for oil/water separation with photocatalysis-PMS synergistic self-cleaning and antibacterial activity","authors":"","doi":"10.1016/j.ijbiomac.2024.137158","DOIUrl":"10.1016/j.ijbiomac.2024.137158","url":null,"abstract":"<div><div>The development of superwetting membranes is a promising approach for separating emulsified oily wastewater. However, challenges such as low flux without external pressure and membrane fouling have hindered membrane performance. Herein, we fabricated a novel nanofibrous membrane by grafting Co-doped Zr-UiO-66-NH<sub>2</sub> (UiO(Zr/Co)) nanoparticles onto carboxylated cellulose nanocrystals (CCNC)-polyacrylonitrile (PAN) mixed matrix electrospinning membrane via chemical bonds through EDC/NHS reaction. CCNC served a dual purpose by enhancing membrane hydrophilicity and providing connection points for UiO(Zr/Co). The as-prepared UiO(Zr/Co)@CCNC/PAN exhibited superhydrophilic/underwater superoleophobic and anti-fouling properties. The membrane demonstrated excellent demulsification and gravity-driven separation capabilities for various oil-in-water emulsions, with superior permeation flux (1588–2557 L m<sup>−2</sup> h<sup>−1</sup>) and separation efficiency (above 99 %). Furthermore, UiO (Zr/Co)@CCNC/PAN could activate peroxomonosulfate (PMS) under visible light to remove both high viscous crude oil-fouling and bio-fouling, exhibiting impressive photocatalytic self-cleaning and antibacterial activity. The generation of reactive radicals (<img>O<sub>2</sub><sup>−</sup>, <img>OH and SO<sub>4</sub><img><sup>−</sup>) and non-radical (<sup>1</sup>O<sub>2</sub>) species in UiO(Zr/Co)@CCNC/PAN+PMS system through multiple pathways was confirmed. Additionally, the band structure of UiO(Zr/Co) and synergistic photocatalytic-PMS activation mechanism were investigated. This work provides new insights into the design and fabrication of MOF modified superwetting nanofibrous membrane with inherent bonding, high permeation flux, anti-fouling and self-cleaning properties.</div></div>","PeriodicalId":333,"journal":{"name":"International Journal of Biological Macromolecules","volume":null,"pages":null},"PeriodicalIF":7.7,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142566269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
From biomass waste to bioaerogels - An alternative sustainable approach for wastewater remediation. 从生物质废物到生物气凝胶--废水补救的另一种可持续方法。
IF 7.7 1区 化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2024-11-02 DOI: 10.1016/j.ijbiomac.2024.136994
A K Priya, Huda M Alghamdi, V Kavinkumar, Khalid Z Elwakeel, Ahmed M Elgarahy

The generation of municipal solid waste is projected to increase from 2.1 billion tonnes in 2023 to 3.8 billion tonnes by 2050. In 2020, the direct global cost of managing this waste was approximately USD 252 billion. When considering additional hidden costs-such as those arising from pollution, adverse health effects, and climate change due to inadequate waste disposal-the total cost escalates to USD 361 billion. Without significant improvements in waste management practices, this figure could nearly double by 2050, reaching an estimated USD 640.3 billion annually. Among municipal solid waste, biowaste accounts for roughly 44 % of the global municipal solid waste, translating to about 840 million tonnes annually. They are widely accessible and economical, offering a cost-effective alternative to traditional treatment materials. Transforming biomass waste into carbon-based materials (e.g., bioaerogels) is a sustainable practice that reduces waste and repurposes it for environmental remediation. This approach not only decreases the volume of waste directed to landfills and mitigates harmful greenhouse gas emissions from decomposition but also aligns with the principles of a circular economy. Furthermore, it supports sustainable development goals by addressing issues such as water scarcity and pollution while promoting waste valorization and resource efficiency. The unique properties of bioaerogels-including their porosity, multi-layered structure, and chemical adaptability-make them highly effective for the remediation of different water pollutants from aquatic bodies. This review article comprehensively delves into multifaceted wastewater remediation strategies -based bioaerogels such as coagulation and flocculation, advanced oxidation processes, membrane filtration, catalytic processes, water disinfection, Oil-water separation, biodegradation, and adsorption. Additionally, it examines different mechanisms of interaction such as surface adsorption, electrostatic interaction, van der Waals forces, ion exchange, surface precipitation, complexation, pore-filling, hydrophobic interactions, and π-π stacking. Moreover, it conducts an integrated techno-economic evaluation to assess their feasibility in wastewater treatment. By valorizing biomass waste, a closed-loop system can be established, where waste is transformed into valuable bioaerogels. This approach not only addresses challenges related to effluent pollution but also generates economic, environmental, and social benefits. Ultimately, the review underscores the transformative potential of bioaerogels in wastewater treatment, emphasizing their crucial role in supporting long-term environmental goals and advancing the principles of resource circularity.

城市固体废物的产生量预计将从 2023 年的 21 亿吨增加到 2050 年的 38 亿吨。2020 年,全球管理这些废物的直接成本约为 2 520 亿美元。如果考虑到额外的隐性成本,如由于废物处理不当造成的污染、对健康的不利影响和气候变化,总成本将上升到 3 610 亿美元。如果不大力改进废物管理方法,到 2050 年,这一数字将翻一番,估计每年将达到 6 403 亿美元。在城市固体废物中,生物垃圾约占全球城市固体废物的 44%,即每年约 8.4 亿吨。生物质废物来源广泛,经济实惠,是传统处理材料的一种经济有效的替代品。将生物质废物转化为碳基材料(如生物气凝胶)是一种可持续的做法,既能减少废物,又能将其重新用于环境修复。这种方法不仅可以减少垃圾填埋量,减少分解产生的有害温室气体排放,还符合循环经济的原则。此外,这种方法还能解决水资源短缺和污染等问题,同时促进废物价值化和提高资源效率,从而支持可持续发展目标。生物气凝胶的独特性能,包括多孔性、多层结构和化学适应性,使其在修复水体中的不同水污染物方面非常有效。这篇综述文章全面探讨了基于生物气凝胶的多方面废水修复策略,如混凝和絮凝、高级氧化过程、膜过滤、催化过程、水消毒、油水分离、生物降解和吸附。此外,它还研究了不同的相互作用机制,如表面吸附、静电相互作用、范德华力、离子交换、表面沉淀、络合、孔隙填充、疏水相互作用和 π-π 堆积。此外,它还进行了综合技术经济评估,以评估其在废水处理中的可行性。通过对生物质废物进行估值,可以建立一个闭环系统,将废物转化为有价值的生物气凝胶。这种方法不仅能应对与污水污染有关的挑战,还能产生经济、环境和社会效益。综述最终强调了生物气凝胶在废水处理方面的变革潜力,强调了其在支持长期环境目标和推进资源循环原则方面的关键作用。
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引用次数: 0
Molecular and structural analyses of voltage-dependent anion channel 2 and its anti-apoptotic function in stress and pollutant resistance in Pacific abalone 电压依赖性阴离子通道 2 的分子和结构分析及其在太平洋鲍鱼抗应激和抗污染中的抗凋亡功能
IF 7.7 1区 化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2024-11-02 DOI: 10.1016/j.ijbiomac.2024.137234
This study aimed to identify voltage-dependent anion channel 2 (Hdh-VDAC2) and determine its functional role in response to acute thermal stress, H2O2-induced stress, heavy metal toxicity, bacterial and viral infections, and during metamorphosis. Structural analysis confirmed that Hdh-VDAC2 is a pore-forming β-barrel protein. Molecular docking further confirmed the protein-protein interactions of Hdh-VDAC2 with Hdh-BAX, Hdh-caspase 3, and Hdh-BCL2. In the Hdh-VDAC2-inhibited hemocytes (HCY), apoptotic genes (Hdh-caspase-3 and Hdh-BAX) exhibited elevated mRNA expression, while the anti-apoptotic gene (Hdh-BCL2) was downregulated. Further, fluorescent techniques confirmed excessive reactive oxygen species (ROS) production, lower cell viability, elevated caspase 3 activity, and increased DNA fragmentation in Hdh-VDAC2-inhibited HCY, indicating an anti-apoptotic role of Hdh-VDAC2 in Pacific abalone. Transcriptomic analysis revealed differential expression patterns, with upregulation in the digestive gland (DG) and downregulation in the gill (GIL) and HCY when comparing heat-tolerant (HT) versus heat-sensitive (HS) abalone groups. Additionally, both cold and heat stresses induced Hdh-VDAC2 expression. Other environmental factors including H2O2, cadmium, bacteria, and viruses, were also shown to induce Hdh-VDAC2 mRNA expression in the GIL and DG of Pacific abalone. During metamorphosis, the blastula (BLS) stage exhibited higher Hdh-VDAC2 mRNA expression. These findings suggest that Hdh-VDAC2 plays a crucial anti-apoptotic role and may be a biomarker for summer mortality in Pacific abalone.
本研究旨在鉴定电压依赖性阴离子通道2(Hdh-VDAC2),并确定其在应对急性热应激、H2O2诱导的应激、重金属毒性、细菌和病毒感染以及变态过程中的功能作用。结构分析证实,Hdh-VDAC2是一种形成孔隙的β-管状蛋白。分子对接进一步证实了Hdh-VDAC2与Hdh-BAX、Hdh-caspase 3和Hdh-BCL2之间的蛋白质相互作用。在Hdh-VDAC2抑制的血细胞(HCY)中,凋亡基因(Hdh-caspase-3和Hdh-BAX)的mRNA表达升高,而抗凋亡基因(Hdh-BCL2)则下调。此外,荧光技术证实,在 Hdh-VDAC2 抑制的 HCY 中,活性氧(ROS)产生过多,细胞活力降低,caspase 3 活性升高,DNA 断裂增加,这表明 Hdh-VDAC2 在太平洋鲍鱼中具有抗凋亡作用。转录组分析显示了不同的表达模式,耐热鲍(HT)与热敏感鲍(HS)组比较,消化腺(DG)表达上调,鳃(GIL)和HCY表达下调。此外,冷胁迫和热胁迫都会诱导 Hdh-VDAC2 的表达。其他环境因素,包括 H2O2、镉、细菌和病毒,也被证明能诱导 Hdh-VDAC2 mRNA 在太平洋鲍鱼的 GIL 和 DG 中表达。在鲍鱼变态过程中,囊胚期(BLS)的 Hdh-VDAC2 mRNA 表达量较高。这些发现表明,Hdh-VDAC2 起着关键的抗凋亡作用,可能是太平洋鲍鱼夏季死亡的生物标志物。
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引用次数: 0
Environment-tolerant, inherently conductive and self-adhesive gelatin-based supramolecular eutectogel for flexible sensor. 用于柔性传感器的环境耐受性、固有导电性和自粘性明胶基超分子共晶凝胶。
IF 7.7 1区 化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2024-11-02 DOI: 10.1016/j.ijbiomac.2024.137219
Zhiyuan Qiao, Ying Chen, Hongyu Pan, Jichang Li, Qingkai Meng, Jianfeng Wang, Yanxia Cao, Wanjie Wang, Yanyu Yang

Although hydrogels have attracted increasing attention in the stretchable devices, the low adhesion properties and poor environmental adaptation still seriously restrict their development and application. Herein, we focused on the interaction between polymer networks with disperse media and their resultant influence on gel performance, and constructed self-adhesive and environment-tolerant gelatin/polyacrylamide supramolecular-polymer double-network (Gelatin/PAM SP-DN) eutectogels using multiple supramolecular interactions between natural macromolecule and well-designed deep eutectic solvent (DES). The dual networks of Gelatin/PAM SP-DN eutectogels produced significant supramolecular forces with DES, including hydrogen bonding and electrostatic interaction, contributing to enhance the energy dissipation capacity. Additionally, the Gelatin-PAM SP-DN eutectogels were more prone to generate strong bonding force to various substrates, showcasing both in-situ and ex-situ adhesion performance, and even being used for wet and underwater adhesion. The eutectogels revealed excellent environmental tolerance to maintain excellent mechanical flexibility, conductivity and adhesion at high and low temperatures, ensuring the constructed sensor to sensitively and reliably perceive strain, pressure and human motions over a wide temperature range. Also, the eutectogel demonstrated great potential as a temperature sensor. This work opens up a new horizon in the design of multifunctional and environment-tolerant natural macromolecule-based gel materials for flexible electronics, human-machine interaction and health diagnosis.

尽管水凝胶在可拉伸设备中越来越受到关注,但其粘附性能低、环境适应性差等问题仍然严重制约着其发展和应用。在此,我们重点研究了聚合物网络与分散介质之间的相互作用及其对凝胶性能的影响,并利用天然大分子与精心设计的深共晶溶剂(DES)之间的多重超分子相互作用,构建了具有自粘性和环境耐受性的明胶/聚丙烯酰胺超分子-聚合物双网络(Gelatin/PAM SP-DN)共凝胶。明胶/PAM SP-DN共晶凝胶的双网络与DES产生了显著的超分子作用力,包括氢键和静电作用,有助于增强能量耗散能力。此外,明胶/PAM SP-DN 共晶凝胶更容易与各种基底产生强大的粘合力,具有原位和非原位粘合性能,甚至可用于湿粘合和水下粘合。这种共晶凝胶具有出色的环境耐受性,在高温和低温条件下都能保持良好的机械柔韧性、导电性和粘附性,从而确保所构建的传感器能在较宽的温度范围内灵敏可靠地感知应变、压力和人体运动。此外,共晶凝胶还显示出作为温度传感器的巨大潜力。这项研究为柔性电子、人机交互和健康诊断领域设计多功能、耐环境的天然大分子凝胶材料开辟了新天地。
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引用次数: 0
Characterization of xanthan gum-metal complexes biosynthesized using a medium containing produced water and cassava processing residues. 利用含有生产用水和木薯加工残渣的培养基生物合成的黄原胶-金属复合物的特征。
IF 7.7 1区 化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2024-11-02 DOI: 10.1016/j.ijbiomac.2024.137229
Thaís de Souza Santos, Paulo Vitor França Lemos, Jamille Santos Santana, Felipe Antônio Silva Anias, Denílson de Jesus Assis, Lucas Guimarães Cardoso, Henrique Rodrigues Marcelino, Ederlan Ferreira de Souza, Jania Betânia Alves da Silva, Carolina Oliveira de Souza

The use of residues from petroleum and crop industries is a feasible and sustainable alternative approach for the production of xanthan gum (XG). This study aimed to evaluate the biosynthesis of XG and the resulting final product obtained using Xanthomonas axonopodis pv. manihotis 1182 in a medium containing produced water (PW) and cassava processing residues. The combined use of PW and cassava crop residues was beneficial for XG production, achieving a product yield of 6.80 g L-1. The micrographs of recovered XG revealed the presence of elongated fiber-like microstructures rather than large agglomerates. The X-ray diffraction profiles of recovered xanthan comprised well-defined peaks rather than an amorphous halo. The thermogravimetry profiles revealed the presence of approximately 60 % of remaining solids in recovered xanthan, in contrast to 30 % in the commercial sample. All the samples demonstrated a pseudoplastic behavior; however, the consistency indices of the recovered samples were approximately 50-times lower than those of commercial XG. The emulsification indices of the recovered XG were > 50 % and comparable to those of commercial xanthan. In this study, for the first time, we obtained a complex XG-metal structure possessing a high emulsification capacity and low viscosity.

利用石油和农作物工业残留物生产黄原胶(XG)是一种可行且可持续的替代方法。这项研究旨在评估黄原胶的生物合成,以及在含有生产用水(PW)和木薯加工残渣的培养基中使用黄单胞菌pv.联合使用废水和木薯加工残渣有利于XG的生产,产品产量达到6.80克/升。回收 XG 的显微照片显示存在细长的纤维状微结构,而不是大的团块。回收黄原胶的 X 射线衍射图显示出清晰的峰值,而不是无定形的光晕。热重曲线显示,回收黄原胶中的剩余固体含量约为 60%,而商用样品中的剩余固体含量仅为 30%。所有样品都表现出假塑性,但回收样品的稠度指数比商用黄原胶低约50倍。回收 XG 的乳化指数大于 50%,与商用黄原胶相当。在这项研究中,我们首次获得了具有高乳化能力和低粘度的XG-金属复合结构。
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引用次数: 0
Immune enhancement of rhamnolipid/manganese calcium phosphate mineralized nanoparticle: A promising subunit antigen delivery system 鼠李糖脂/锰磷酸钙矿化纳米粒子的免疫增强作用:一种前景广阔的亚单位抗原递送系统
IF 7.7 1区 化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2024-11-02 DOI: 10.1016/j.ijbiomac.2024.137239
The use of biomimetic mineralization strategy is promising to solve the problem of poor stability and immune effect of subunit antigens. However, non-specifically inducing protein mineralization is still a challenge. we hypothesized that rhamnolipids with both protein and metal binding capacity could be used to develop more functional and biocompatible calcium mineralized nanoparticle (RMCP). The results show that rhamnolipids synergistically enhanced the mineralization of protein with manganese ions and improved 21 % the loading antigens of RMCP compared to manganese calcium phosphate nanoparticles. Transmission electron microscopy (TEM) and Dynamic Light Scattering (DLS) showed particle size of RMCP is 260 ± 12.1 nm with spherical morphology. In vitro experiments have shown that RMCP effectively activate immune cells through the cGAS-STING and NLRP3 pathways and demonstrated a higher level of cytokines in RAW264.7 Macrophages. In vivo, RMCP triggered an increased IgG titer with 16.5-fold IgG2a/IgG1 ratio compared to the aluminum adjuvant which improved the recovery status after challenge in mice. We used biological surfactants for the first time to enhance the biomimetic mineralization process of subunit antigen, which provides a new approach for constructing calcium-based biocompatible antigen delivery vectors, helping to develop a new generation of stable, efficient, and safe subunit vaccines.
使用仿生矿化策略有望解决亚单位抗原稳定性差和免疫效应的问题。然而,非特异性地诱导蛋白质矿化仍然是一个挑战。我们假设,具有蛋白质和金属结合能力的鼠李糖脂可用于开发功能更强、生物相容性更好的钙矿化纳米粒子(RMCP)。结果表明,鼠李糖脂能协同增强蛋白质与锰离子的矿化作用,与磷酸钙锰纳米粒子相比,鼠李糖脂能使矿化纳米粒子的抗原负载量提高 21%。透射电子显微镜(TEM)和动态光散射(DLS)显示,RMCP 的粒径为 260 ± 12.1 nm,呈球形。体外实验表明,RMCP 可通过 cGAS-STING 和 NLRP3 通路有效激活免疫细胞,并在 RAW264.7 巨噬细胞中显示出较高的细胞因子水平。在体内,与铝佐剂相比,RMCP 可提高 IgG 滴度,IgG2a/IgG1 比值为 16.5 倍,从而改善小鼠挑战后的恢复状况。我们首次利用生物表面活性剂增强了亚单位抗原的仿生矿化过程,为构建钙基生物相容性抗原递送载体提供了一种新方法,有助于开发稳定、高效、安全的新一代亚单位疫苗。
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引用次数: 0
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International Journal of Biological Macromolecules
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