一、定制服务内容
西安球赛在线直播平台 生物专注于PEG修饰无机纳米颗粒定制,依托成熟制备平台,提供全品类、精细化定制服务,覆盖科研级小批量试产至产业化中试供应,全程严控质量,配套完整技术支持,核心细分方向如下,精准适配各类科研与应用需求:
(一)核心基材定制
• PEG修饰磁性Fe₃O₄纳米颗粒:粒径5-500nm精准调控(公差±10nm),PEG分子量1000-20000按需选择,末端基团(-NH₂、-COOH等)可偶联靶向分子,适配MRI成像、磁靶向药物递送等场景,采用水热法或共沉淀法制备,提升胶体稳定性与生物相容性。
• PEG修饰金纳米颗粒:粒径5-100nm可调,支持球形、棒状等形貌定制,通过巯基-金共价键接枝PEG,可结合荧光标记(FITC、Cy3)或光热性能优化,适配光热*、细胞成像等场景,采用柠檬酸钠还原法制备,分散性优良。
• PEG修饰二氧化硅纳米颗粒:涵盖介孔、实心、中空等结构,孔径2-30nm可调,粒径50-500nm定制,通过硅烷化反应共价接枝PEG,末端基团可定制,适配药物递送、载体负载、催化反应等场景,采用溶胶-凝胶法制备。
• 其他基材:PEG修饰TiO₂、CeO₂、ZnO等无机纳米颗粒,按需定制粒径、分散性及表面性能,适配多领域基础科研与应用场景。
(二)修饰参数定制
• PEG参数:分子量(1000-20000)、末端活性基团(-NH₂、-COOH、-MAL、生物素等)按需筛选,满足后续功能拓展需求。
• 修饰方式:共价键合(硅烷化、巯基-金反应)与物理包覆两种可选,共价修饰结合牢固、耐洗脱,适配活体实验;物理包覆工艺温和,保护敏感材料性能。
• 性能调控:粒径均一性(PDI<0.15)、修饰密度调整,提升产品胶体稳定性、生物相容性,降低非特异性吸附,避免团聚。
(三)功能化定制
• 靶向修饰:叶酸、cRGD、转铁蛋白、*体偶联PEG-无机纳米颗粒,实现肿瘤等特定靶点精准识别,适配靶向递送、靶向成像场景。
• 荧光标记:FITC、Cy3、Cy5、Cy7、ICG等荧光分子标记,适配细胞成像、活体示踪等场景,荧光稳定性优良,示踪效果清晰。
• 载药修饰:化疗药、蛋白、核酸等负载于PEG修饰介孔二氧化硅/磁性纳米颗粒,实现药物精准递送,提升利用率、降低毒副作用。
• 刺激响应:pH敏感、还原敏感、温敏型PEG修饰,实现智能释药或性能调控,适配复杂应用场景。
(四)配套服务
提供粒径分析(DLS)、形貌表征(TEM)、表面电位测试及稳定性评估等检测服务,提供定制化技术方案与售后保障,助力科研成果转化与产业落地。

二、定制案例展示
案例均为实际完成定制项目,附核心参数与表征图,直观呈现定制能力,所有案例均通过严格质量检测,确保批次稳定性与性能达标。
案例1:荧光标记PEG-金纳米颗粒定制
定制需求:金纳米颗粒粒径15nm,PEG分子量2000,末端基团-MAL,偶联FITC荧光分子,用于细胞示踪实验,要求荧光稳定性强、无明显淬灭,批量500mg供应。

案例2:PEG修饰介孔二氧化硅载药纳米颗粒定制
定制需求:介孔二氧化硅粒径100nm,孔径5nm,PEG分子量10000,末端基团-NH₂,负载化疗药物DOX,用于药物递送研究,要求载药率≥20%,pH敏感释药,中试批量10g供应。

三、典型高分文献摘抄及翻译
文献1:Surface functionalization of nanoparticles with polyethylene glycol (PEG): Effects on human serum albumin adsorption and cellular uptake
期刊:Nanomedicine(IF=10.2,2023)
原文摘抄
Here we have investigated the effect of enshrouding polymer-coated nanoparticles (NPs) with polyethylene glycol (PEG) on the adsorption of proteins and uptake by cultured cells. PEG was covalently linked to the polymer surface to the maximal grafting density achievable under our experimental conditions. Changes in the effective hydrodynamic radius of the NPs upon adsorption of human serum albumin (HSA) were measured in situ by using fluorescence correlation spectroscopy (FCS). For NPs without a PEG shell, a thickness increase of around 3 nm, corresponding to HSA monolayer adsorption, was measured at high HSA concentration. Only 50% of this value was found for NPs with pegylated surfaces. While the size increase reveals formation of a protein corona also for pegylated NPs, fluorescence lifetime measurements and quenching experiments suggest that the adsorbed HSA molecules are buried within the PEG shell. In vitro uptake of the NPs by 3T3 fibroblasts was reduced to around 10% upon pegylation with PEG chains of 10 kDa. Thus, even though the PEG coatings did not completely prevent protein adsorption, the pegylated NPs still displayed a pronounced reduction of cellular uptake with respect to bare NPs, which is to be expected if the adsorbed proteins are not exposed on the NP surface.
中文翻译
本文研究了聚乙二醇(PEG)包覆聚合物修饰纳米颗粒(NPs)对蛋白质吸附及培养细胞摄取的影响。在实验条件下,将PEG以*大接枝密度共价连接到聚合物表面。通过荧光相关光谱(FCS)原位测量人血清白蛋白(HSA)吸附后纳米颗粒有效水动力半径的变化。对于无PEG外壳的纳米颗粒,在高HSA浓度下,其厚度增加约3 nm,对应HSA单层吸附;而PEG修饰后的纳米颗粒,厚度增加量仅为该值的50%。尽管尺寸增加表明PEG修饰后的纳米颗粒也会形成蛋白质冠,但荧光寿命测量和猝灭实验表明,吸附的HSA分子被包埋在PEG外壳内。使用10 kDa PEG链修饰后,3T3成纤维细胞对纳米颗粒的体外摄取量降低至约10%。因此,尽管PEG涂层不能完全阻止蛋白质吸附,但与裸纳米颗粒相比,PEG修饰后的纳米颗粒仍能显著降低细胞摄取量,这是因为吸附的蛋白质未暴露在纳米颗粒表面。
文献核心参考:明确PEG修饰可显著降低纳米颗粒的蛋白质吸附和细胞非特异性摄取,提升生物相容性,为我们的PEG修饰工艺优化(如接枝密度控制)提供核心理论支撑,与我们的定制产品性能一致。
文献2:Impacts of polyethylene glycol (PEG) dispersity on protein adsorption, pharmacokinetics, and biodistribution of PEGylated gold nanoparticles
期刊:RSC Advances(IF=4.5,2024)
原文摘抄
PEGylation is a well-established strategy to improve the colloidal stability and biocompatibility of gold nanoparticles (AuNPs), thereby extending their circulation time in vivo and reducing their clearance by the mononuclear phagocyte system (MPS). The dispersity of PEG chains, including molecular weight distribution and grafting density, plays a crucial role in determining the performance of PEGylated AuNPs. In this study, we prepared AuNPs modified with PEG of different dispersities and characterized their protein adsorption behavior, pharmacokinetic profiles, and biodistribution in mice. The results showed that AuNPs modified with PEG of narrow dispersity exhibited lower protein adsorption, longer blood circulation time, and more uniform biodistribution compared to those modified with PEG of broad dispersity. Additionally, the grafting density of PEG significantly affected the stealth properties of AuNPs, with higher grafting density leading to better MPS evasion and improved in vivo performance.
中文翻译
PEG修饰是一种成熟的策略,可改善金纳米颗粒(AuNPs)的胶体稳定性和生物相容性,从而延长其在体内的循环时间,降低单核吞噬系统(MPS)的清除率。PEG链的分散性(包括分子量分布和接枝密度)对PEG修饰金纳米颗粒的性能起着关键作用。本研究制备了不同分散性PEG修饰的金纳米颗粒,并表征了其蛋白质吸附行为、药代动力学特征及在小鼠体内的分布。结果表明,与宽分散性PEG修饰的金纳米颗粒相比,窄分散性PEG修饰的金纳米颗粒表现出更低的蛋白质吸附、更长的血循环时间和更均匀的体内分布。此外,PEG的接枝密度显著影响金纳米颗粒的隐身性能,接枝密度越高,对单核吞噬系统的逃避能力越强,体内性能越好。
文献核心参考:明确PEG分散性、接枝密度对纳米颗粒体内性能的影响,为我们的定制服务(如PEG分子量选择、修饰密度调控)提供精准理论依据,确保定制产品适配体内实验等高端科研需求。
四、文献引用链接
1. //pmc.ncbi.nlm.nih.gov/articles/PMC11216039/(Impacts of polyethylene glycol (PEG) dispersity on protein adsorption, pharmacokinetics, and biodistribution of PEGylated gold nanoparticles)
2. //zaguan.unizar.es/record/150243/files/texto_completo.pdf?version=1(Surface functionalization of nanoparticles with polyethylene glycol (PEG): Effects on human serum albumin adsorption and cellular uptake)
3. //pmc.ncbi.nlm.nih.gov/articles/PMC8510204/(Understanding the Adsorption of Peptides and Proteins onto PEGylated Gold Nanoparticles)
4. //pubs.acs.org/doi/10.1021/acsami.1c08674(PEG-Modified Fe₃O₄ Nanoparticles for Magnetic Resonance Imaging and Targeted Drug Delivery)
5. //www.mdpi.com/2079-4991/13/17/3044(PEGylated Mesoporous Silica Nanoparticles: A Promising Carrier for Drug Delivery)
6. //www.sciencedirect.com/science/article/pii/S016836592200878X(PEGylation Strategies for Inorganic Nanoparticles: From Synthesis to Biomedical Applications)
7. //pubs.rsc.org/en/content/articlelanding/2022/nr/d2nr03457a(PEG-Modified Gold Nanoparticles for Photothermal Therapy of Tumors)
8. //www.nature.com/articles/s41598-023-32456-7(Enhanced Biocompatibility of PEGylated TiO₂ Nanoparticles for Biomedical Applications)
9. //www.sciencedirect.com/science/article/pii/S174270612100385X(Stimuli-Responsive PEGylated Nanoparticles for Smart Drug Delivery)
10. //pubs.acs.org/doi/10.1021/acs.jpcb.9b07845(Effect of PEG Molecular Weight on the Stability and Cellular Uptake of ZnO Nanoparticles)
11. //www.mdpi.com/2073-4360/14/12/2456(PEGylated Silver Nanoparticles: Antibacterial Activity and Biocompatibility Evaluation)
五、具体产品列表
产品类别 | 产品名称 | 核心参数(可定制) | 适配场景 |
PEG修饰Fe₃O₄磁性纳米颗粒 | 常规款PEG-mPEG Fe₃O₄ | 粒径20nm、50nm;PEG分子量2000、5000;无活性基团 | 基础科研、磁分离预处理 |
PEG修饰Fe₃O₄磁性纳米颗粒 | 功能款PEG-COOH/NH₂ Fe₃O₄ | 粒径30-80nm;PEG分子量1000-20000;末端-COOH/-NH₂ | MRI成像、磁靶向药物递送 |
PEG修饰Fe₃O₄磁性纳米颗粒 | 定制款PEG-荧光/靶向Fe₃O₄ | 粒径5-500nm;PEG分子量按需;荧光标记/靶向偶联 | 活体示踪、肿瘤靶向实验 |
PEG修饰金纳米颗粒 | 常规款PEG-mPEG纳米金 | 粒径10nm、20nm、30nm;PEG分子量2000 | 光学检测、基础光热实验 |
PEG修饰金纳米颗粒 | 功能款PEG-COOH/NH₂/MAL纳米金 | 粒径15-25nm;PEG分子量2000-10000;末端活性基团 | 细胞成像、光热* |
PEG修饰金纳米颗粒 | 定制款PEG-荧光/形貌定制纳米金 | 粒径5-100nm;PEG按需;荧光标记/棒状/星状形貌 | 高端科研、特异性检测 |
PEG修饰二氧化硅纳米颗粒 | 常规款PEG-mPEG SiO₂ | 粒径50nm、100nm;PEG分子量5000;实心/介孔 | 载体负载、吸附实验 |
PEG修饰二氧化硅纳米颗粒 | 功能款PEG-COOH/NH₂介孔SiO₂ | 粒径80-150nm;PEG分子量5000-10000;孔径2-30nm | 药物递送、催化反应 |
PEG修饰二氧化硅纳米颗粒 | 定制款PEG-载药/荧光SiO₂ | 粒径50-500nm;PEG按需;载药/荧光标记 | 智能药物递送、活体成像 |
其他PEG修饰无机纳米颗粒 | PEG-TiO₂/CeO₂/ZnO纳米颗粒 | 粒径10-60nm;PEG分子量按需;表面性能定制 | 基础科研、环境检测、催化 |
复合功能PEG纳米颗粒 | PEG-靶向/荧光/载药复合颗粒 | 基材按需;PEG参数定制;多功能集成 | 多模态成像、协同* |


球赛在线直播平台
微信公众号
官方微信