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生物材料与纳米技术(英文)最新文献

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Fabrication and Characterization of Chitosan Based Injectable Thermosensitive Hydrogels Containing Silica/Calcium Phosphate Nanocomposite Particles 含二氧化硅/磷酸钙纳米复合颗粒的壳聚糖基注射用热敏水凝胶的制备与表征
Pub Date : 2021-05-28 DOI: 10.4236/jbnb.2021.123004
S. Latifi, Christina Tang, H. Donahue
In this study, the effect of silica/calcium phosphate (SiCaP) nanocomposite particles on the properties of a novel chitosan-based thermosensitive hydrogel system was examined. SiCaP nanocomposite powder was fabricated using a sol-gel method and then used to fabricate nanocomposite hydrogels (Ch- β/7.5SiCaP and Ch-β/15SiCaP) including chitosan and β-glycerophosphate (Ch-β) as a matrix. Results revealed that compared to the Ch-β hydrogel without SiCaP, the presence of SiCaP particles in nanocomposite hydrogels maintained pH stability during the sol-gel transition, accelerated the gelation and improved the stiffness of nanocomposite hydrogels. Gelation time at 37℃ was reduced approximately 75% and stiffness was increased approximately 115%. Both of these changes are attributed to chemical and physical interactions of the SiCaP bioactive particles with chitosan. Furthermore, compared to the Ch-β hydrogel, the presence of SiCaP in the Ch-β/7.5SiCaP nanocomposite hydrogel did not affect biocompatibility negatively, but improved osteoblastic cell differentiation. Our studies suggest that these nanocomposite hydrogels may offer an innovative approach to bone regeneration strategies.
本研究考察了二氧化硅/磷酸钙(SiCaP)纳米复合颗粒对新型壳聚糖基热敏水凝胶体系性能的影响。采用溶胶-凝胶法制备SiCaP纳米复合粉体,以壳聚糖和β-甘油磷酸酯(Ch-β)为基质制备了Ch-β/ 7.5SiCaP和Ch-β/15SiCaP纳米复合水凝胶。结果表明,与不含SiCaP的Ch-β水凝胶相比,SiCaP颗粒的存在使纳米复合水凝胶在溶胶-凝胶转变过程中保持了pH稳定,加速了凝胶化,提高了纳米复合水凝胶的刚度。37℃下的胶凝时间减少了约75%,刚度增加了约115%。这两种变化都归因于SiCaP生物活性颗粒与壳聚糖的化学和物理相互作用。此外,与Ch-β水凝胶相比,Ch-β/7.5SiCaP纳米复合水凝胶中SiCaP的存在并未对生物相容性产生负面影响,而是促进了成骨细胞的分化。我们的研究表明,这些纳米复合水凝胶可能为骨再生策略提供一种创新的方法。
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引用次数: 2
Gold Nanoparticles/Thermochromic Composite Film on Screen-Printed Electrodes for Simultaneous Detection of Protein and Temperature 丝网印刷电极上的金纳米粒子/热致变色复合膜同时检测蛋白质和温度
Pub Date : 2021-04-22 DOI: 10.4236/JBNB.2021.122002
Dorothy Araba Yakoba Agyapong, Hanjia Jiang, Xin-Ye Ni, Jingwen Wu, Hong-juan Zeng
In this study, gold nanoparticles and thermochromic composite films modified screen-printed carbon electrodes (TM-AuNPsSPCEs) were developed as a platform for the simultaneous detection of protein and temperature. The TM-AuNPs composited film had better sensitivity resulting from the gold nanoparticles amplification effect. A phase transition model analysis of TM-AuNPs films found that the TM-AuNPs films had three-phase transition intervals ( 80℃) which accommodated the temperature requirements for protein denaturation. When used to detect different concentrations of haemoglobin (Hb) solution, the TM-AuNPs modified SPCEs had a better sensitivity in detecting the different concentrations in comparison to TM and AuNP modified SPCEs which showed no clear sensitivity towards the different Hb concentrations. The dual detection and excellent sensitivity show a good application prospect for the study of the TM-AuNPs composite film.
在本研究中,开发了金纳米粒子和热致变色复合膜修饰的丝网印刷碳电极(TM AuNPsSPCEs),作为同时检测蛋白质和温度的平台。由于金纳米粒子的放大效应,TM AuNPs复合膜具有更好的灵敏度。对TM-AuNPs薄膜的相变模型分析发现,TM-AuNP薄膜具有三相过渡间隔(80℃),满足蛋白质变性的温度要求。当用于检测不同浓度的血红蛋白(Hb)溶液时,与对不同Hb浓度没有明显敏感性的TM和AuNP修饰的SPCE相比,TM和AuNPs修饰的SPCEs在检测不同浓度时具有更好的灵敏度。这种双重检测和优异的灵敏度为TM AuNPs复合膜的研究显示出良好的应用前景。
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引用次数: 1
Skin Cancer Treatment by Nanoskin Cellulose: Future Cancer Wound Healing 纳米皮肤纤维素治疗皮肤癌:未来癌症伤口愈合
Pub Date : 2021-01-01 DOI: 10.4236/jbnb.2021.121001
P. Basmaji, Gabriel Molina de Olyveira, Mohamed M. Kanjou
Cancer cells can be proliferating in a few months and years. It depends on cancer stage. Chemotherapy, immunotherapy and anti-metabolic drugs have been used in order to kill cancer cells and prevent immune system weakly and metastasis. However, such drugs can damage healthy cells too. Natural ways to cancer treatments may help whole body to cancer cells. In this work, it was taking off cancer nodule to skin cancer by surgery and we treat the nodule as wound, using Nanoskin® advance cell therapy (ACT), natural extra cellular matrix which releases nutrients to the skin cancer. Our result shows that the cancer nodule disappears in few weeks in skin, because of natural membrane treatment. In addition, we obtained complete wound healing due anticancer nutrients (beta-glucan) delivery to skin.
癌细胞可以在几个月或几年内增殖。这取决于癌症的阶段。化疗、免疫治疗和抗代谢药物已被用于杀死癌细胞,防止免疫系统衰弱和转移。然而,这些药物也会损害健康细胞。自然的癌症治疗方法可以帮助全身的癌细胞。在这项工作中,它是通过手术将癌症结节转移到皮肤癌,我们使用Nanoskin®先进细胞疗法(ACT)将结节作为伤口治疗,天然细胞外基质向皮肤癌释放营养物质。我们的结果表明,由于自然膜治疗,癌症结节在几周内消失在皮肤上。此外,由于抗癌营养素(β -葡聚糖)输送到皮肤,我们获得了完全的伤口愈合。
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引用次数: 3
Insightful Understanding of the Role of the Mechanical Properties in Defining the Reliability of All-Ceramic Dental Restorations: A Review 力学性能在确定全陶瓷修复体可靠性中的作用的深刻理解:综述
Pub Date : 2021-01-01 DOI: 10.4236/jbnb.2021.124006
M. Albakry
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引用次数: 3
Gold Nanoparticles Incorporated with Cyclodextrins and Its Applications 含环糊精的金纳米颗粒及其应用
Pub Date : 2021-01-01 DOI: 10.4236/jbnb.2021.124007
Fahad Alanazi, D. Salah
Cyclodextrins are naturally oligosaccharides which had cyclic glucopyrano-side units even if six units to form α-cyclodextrin (α-CD), seven units β-cyclodextrin (β-CD) or eight units γ-cyclodextrin (γ-CD) and some other derivatives. It has a truncated cone shape with a hydrophobic cavity and a hydrophilic from the external surface of cyclodextrins. Gold nanoparticles incorporated with cyclodextrins enhanced optical and electrical properties of the resulting conjugates, due to the gold nanoparticles’ unique physical and chemical properties because of their surface plasmon resonance. Here is a review of gold nanoparticles/cyclodextrin’s different applications including sensing, antimicrobial effect, and their variable medical/pharmaceutical applications. Generally, gold nanoparticles and cyclodextrin conjugates showed developed and pronounced advantages due to their biocompatibility and enhanced physical and electric properties.
环糊精是一种天然的低聚糖,具有环葡核苷侧单位,即使有6个单位可以形成α-环糊精(α-CD)、7个单位的β-环糊精(β-CD)或8个单位的γ-环糊精(γ-CD)及其衍生物。它具有截断的圆锥体形状,具有疏水腔和环糊精外表面的亲水性。与环糊精结合的金纳米颗粒由于其表面等离子体共振而具有独特的物理和化学性质,从而增强了所得到的共轭物的光学和电学性能。本文综述了金纳米颗粒/环糊精的不同应用,包括传感、抗菌作用及其各种医疗/制药应用。总的来说,金纳米颗粒和环糊精缀合物由于其生物相容性和增强的物理和电学性能而显示出发展和显著的优势。
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引用次数: 2
In-Silico Validation and Development of Chlorogenic Acid (CGA) Loaded Polymeric Nanoparticle for Targeting Neurodegenerative Disorders 用于靶向神经退行性疾病的负载绿原酸(CGA)的聚合物纳米颗粒的硅内验证和开发
Pub Date : 2020-08-20 DOI: 10.4236/jbnb.2020.114018
V. Agarwal, S. Agarwal, R. Kaur, Pranav Pancham, Harleen Kaur, Siddhi Bhardwaj, Manisha Singh
Background: Recent decades witnessed a significant growth in terms of phytocompounds based therapeutics, extensively explored for almost all types of existing disorders. They have also been widely investigated in Neurodegenerative disorders (NDDs) and Chlorogenic acid (CGA), a polyphenolic compound having potential anti-inflammatory and anti-oxidative properties, emerged as a promising compound in ameliorating NDDs. Owing to its poor stability, bioavailability and release kinetics, CGA needed a suitable nanocarrier based pharmaceutical design for targeting NDDs. Objective: The current study is aimed at the in-silico validation of CGA as an effective therapeutic agent targeting various NDDs followed by the fabrication of polymeric nanoparticles-based carrier system to overcome its pharmacological limitations and improve its stability. Methods: A successful in-silico validation using molecular docking techniques along with synthesis of CGA loaded polymeric nanoparticles (CGA-NPs) by ionic gelation method was performed. The statistical optimisation of the developed CGA-NPs was done by Box Behnken method and then the optimized formulation of CGA-NPs was characterised using particle size analysis (PSA), Transmission electron microscopy (TEM), Fourier Transform Infrared spectroscopy (FTIR) along with in-vitro release kinetics analysis. Results & Conclusion: The results attained exhibited average particle size of 101.9 ± 1.5 nm, Polydispersibility (PDI) score of 0.065 and a ZP of −17.4 mV. On a similar note, TEM results showed a size range of CGA-NPs between 90 - 110 nm with a spherical shape of NPs. Also, the data from in-vitro release kinetics showed a sustained release of CGA from the NPs following the first-order kinetics suggesting the appropriate designing of nanoformulation.
背景:近几十年来,基于植物化合物的治疗方法有了显著的发展,对几乎所有类型的现有疾病都进行了广泛的探索。它们在神经退行性疾病(NDDs)中也得到了广泛的研究,绿原酸(CGA)是一种具有潜在抗炎和抗氧化特性的多酚化合物,是一种有前途的改善NDDs的化合物。由于其较差的稳定性、生物利用度和释放动力学,CGA需要一种合适的基于纳米载体的药物设计来靶向NDDs。目的:本研究旨在通过计算机验证CGA作为一种有效的治疗剂靶向各种NDD,然后制备基于聚合物纳米颗粒的载体系统,以克服其药理学局限性并提高其稳定性。方法:使用分子对接技术进行了成功的计算机验证,并通过离子凝胶法合成了负载CGA的聚合物纳米颗粒(CGA-NPs)。通过Box-Behnken方法对所开发的CGA NPs进行统计优化,然后使用粒度分析(PSA)、透射电子显微镜(TEM)、傅里叶变换红外光谱(FTIR)以及体外释放动力学分析对CGA NP的优化配方进行表征。结果与结论:所获得的结果显示平均粒径为101.9±1.5 nm,多分散性(PDI)得分为0.065,ZP为−17.4 mV。同样,TEM结果显示CGA NPs的尺寸范围在90-110 nm之间,呈球形。此外,来自体外释放动力学的数据显示,CGA从NP的持续释放遵循一级动力学,这表明纳米制剂的适当设计。
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引用次数: 3
Molecular Dynamics Study of Collagen Fibrils: Relation between Mechanical Properties and Molecular Chirality 胶原原纤维的分子动力学研究:力学性能与分子手性的关系
Pub Date : 2020-08-20 DOI: 10.4236/jbnb.2020.114017
K. Saitoh, Tomohiro Sato, M. Takuma, Y. Takahashi
Collagen is a basic biopolymer usually found in animal bodies, but its mechanical property and behavior are not sufficiently understood so as to apply to effective regenerative medicine and so on. Since the collagen material is composed of many hierarchical structures from atomistic level to tissue or organ level, we need to well understand fundamental and atomistic mechanism of the collagen in mechanical response. First, we approach at exactly atomistic level by using all-atom modeling of tropocollagen (TC) molecule, which is a basic structural unit of the collagen. We perform molecular dynamics (MD) simulations concerning tensile loading of a single TC model. The main nature of elastic (often superelastic) behavior and the dependency on temperature and size are discussed. Then, to aim at coarse-graining of atomic configuration into some bundle structure of TC molecules (TC fibril), as a model of higher collagen structure, we construct a kind of mesoscopic model by adopting a simulation framework of beads-spring model which is ordinarily used in polymer simulation. Tensile or compression simulation to the fibril model reveals that the dependency of yield or buckling limit on the number of TCs in the model. Also, we compare the models with various molecular orientations in winding process of initial spiral of TC. The results are analyzed geometrically and it shows that characteristic orientational change of molecules increases or decreases depending on the direction and magnitude of longitudinal strain.
胶原蛋白是一种常见于动物体内的基本生物聚合物,但其力学性能和行为尚不清楚,无法应用于有效的再生医学等。由于胶原蛋白材料由从原子水平到组织或器官水平的许多分级结构组成,我们需要很好地理解胶原在机械反应中的基本和原子机制。首先,我们通过使用原胶原(TC)分子的全原子建模,在原子水平上进行研究,原胶原是胶原的基本结构单元。我们对单个TC模型的拉伸载荷进行了分子动力学(MD)模拟。讨论了弹性(通常是超弹性)行为的主要性质以及对温度和尺寸的依赖性。然后,为了将原子构型粗粒化为TC分子的某些束结构(TC原纤维),作为一种高级胶原结构的模型,我们采用聚合物模拟中常用的珠-弹簧模型的模拟框架,构建了一种介观模型。对原纤维模型的拉伸或压缩模拟揭示了屈服或屈曲极限对模型中TC数量的依赖性。此外,我们还比较了TC初始螺旋缠绕过程中不同分子取向的模型。结果进行了几何分析,表明分子的特征取向变化随纵向应变的方向和大小而增加或减少。
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引用次数: 2
The Development of the Heparin Monitoring System Based on Microfluidics Technology 基于微流体技术的肝素监测系统的研制
Pub Date : 2020-05-11 DOI: 10.4236/jbnb.2020.113013
Jingwen Zhou
Heparin monitoring is widely used to measure the anticoagulant effect of unfractionated heparin and adjust the dose to keep within the target treatment range. This technology has applications in many fields and also prospects in the future. Its application has the advantages of rapidity, high throughput and minimum sample consumption. Many point of care devices for heparin monitoring are available. The CoaguChek device only requires a small sample size, which is obtained through a fingerstick. Over the last few years, the point-of-care (POC) testing was used widely for its convenience, efficiency, and faster turnaround times.
肝素监测广泛用于测量普通肝素的抗凝效果,并调整剂量以保持在目标治疗范围内。该技术在许多领域都有应用,也有发展前景。它的应用具有快速、高通量和最小样本消耗的优点。许多用于肝素监测的护理点设备是可用的。CoaguChek设备只需要一个小样本量,这是通过手指棒获得的。在过去的几年里,护理点(POC)测试因其方便、高效和更快的周转时间而被广泛使用。
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引用次数: 0
Ultrastructural Characterization of the Titanium Surface Degree IV in Dental Implant Aluminum Free (Acid Attack) 无铝(酸蚀)种植体钛表面Ⅳ度的超微结构表征
Pub Date : 2020-05-11 DOI: 10.4236/jbnb.2020.113009
I. Brum, M. A. Carvalho, P. Santos, R. Devita, J. Pires, J. J. Carvalho
Following the worldwide trend of developing heavy metal free materials, dental implants aren’t out of this tendency. Over the years, a number of techniques to condition the surface of dental implants have been designed and used such as oxide blasting, however the scientific medical community has been concerned about the use of these heavy metals which leads us to investigate and develop new conditioning techniques. The aim of the study was the analysis of the Systhex® implant surface in automatic system for the treatment of the surface with acid, where we can identify the surfaces purity level, pore size, deepness and especially the roughness proportionated by the technology of acid conditioning on the titanium surfaces of degree IV dental implants. We conclude that the automatic conditioning of acid attack promoted cleanliness, homogeneity and ideal roughness for the osseointegration process.
随着世界范围内开发无重金属材料的趋势,种植牙也没有脱离这一趋势。多年来,已经设计并使用了许多对牙科植入物表面进行处理的技术,如氧化物喷砂,但科学医学界一直关注这些重金属的使用,这促使我们研究和开发新的处理技术。本研究的目的是在用酸处理表面的自动系统中对Systhex®植入物表面进行分析,在该系统中,我们可以确定表面纯度、孔径、深度,尤其是通过酸处理技术对IV级牙科植入物的钛表面成比例的粗糙度。我们的结论是,酸性侵蚀的自动调节促进了骨整合过程的清洁度、均匀性和理想的粗糙度。
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引用次数: 5
Natural Nanoskin ACT Management of the Rare Disease as Burnt Patient with Epidermolysis Bullosa and Stevens-Johnson 天然纳米皮肤ACT治疗烧伤大疱性表皮松解症和Stevens-Johnson罕见病
Pub Date : 2020-05-11 DOI: 10.4236/jbnb.2020.113012
P. Basmaji, nia Martins, M. Kanjo
Epidermolysis Bullosa (EB) is a group of rare genetic skin conditions, which is characterised by extremely fragile skin and recurrent blister formation, resulting from minor mechanical friction or trauma. Sufferers of EB have compared the sores to third-degree burns. Stevens-Johnson syndrome is a rare but very serious skin problem, which causes the appearance of reddish lesions throughout the body and other changes, such as difficulty in breathing and fever, which can endanger the life of the affected person. The aim of this study was to show efficacy of a NANOSKIN ACT, AND NANOSKIN ACT SOFT wound dressing on the wound care management in patients with EB AND Stevens-Johnson syndrome (SJS).
大疱性表皮松解症(EB)是一组罕见的遗传性皮肤病,其特征是由于轻微的机械摩擦或创伤导致皮肤极度脆弱和反复形成水疱。EB患者将溃疡比作三度烧伤。史蒂文斯-约翰逊综合征是一种罕见但非常严重的皮肤问题,会导致全身出现红色病变和其他变化,如呼吸困难和发烧,这可能危及患者的生命。本研究的目的是显示NANOSKIN-ACT和NANOSKIN-ACT软伤口敷料对EB和Stevens-Johnson综合征(SJS)患者伤口护理管理的疗效。
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引用次数: 1
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