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Agilent 1100 Series HPLC

Company: Agilent Technologies
Catalog#: Agilent 1100 Series
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Xanthoferrin Siderophore Estimation from the Cell-free Culture Supernatants of Different Xanthomonas Strains by HPLC
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Date:
2017-07-20
[Abstract]  Xanthomonads can scavenge iron from the extracellular environment by secreting the siderophores, which are synthesized by the proteins encoded by xss (Xanthomonas siderophore synthesis) gene cluster. The siderophore production varies among xanthomonads in response to a limited supply of iron where Xanthomonas campestris pv. campestris (Xcc) produces less siderophores than Xanthomonas oryzae pv. oryzae (Xoo) and Xanthomonas oryzae pv. oryzicola (Xoc). Siderophore production can be measured by HPLC and with the CAS (Chrome azurol S)-agar plate assay, however HPLC is a more accurate method over CAS-agar plate assay ... [摘要]  黄单胞菌属可以通过分泌铁载体来从细胞外环境中清除铁,这些铁载体由由xss 编码的蛋白质(anthomonas 基因簇。 由于Xanthomonas campestris pv的铁供应有限,铁载体生产因黄托曼德而异。 野蓟菊(Xcc)产生比黄单胞菌(Xanthomonas oryzae)pv更少的铁载体。 米曲霉(Xoo)和黄单胞菌Xanthomonas oryzae pv。 oryzicola(Xoc)。 铁载体生产可以通过HPLC和CAS测量( Chrome azurol S )标准板测定,然而HPLC是在Xanthomonads中用于铁氰菊酯定量的CAS-琼脂平板测定的更准确的方法。 在这里我们描述如何使用高效液相色谱来量化黄单胞菌中的铁载体。
【背景】细菌植物病原体 Xanthomonas 具有(α-羟基羧酸盐型铁载体;类似于弧菌铁蛋白)和编码参与铁载体介导的铁吸收的外膜受体(Pandey和Sonti)所需的操纵子,2010; ...

Loading of Extracellular Vesicles with Chemically Stabilized Hydrophobic siRNAs for the Treatment of Disease in the Central Nervous System
Author:
Date:
2017-06-20
[Abstract]  Efficient delivery of oligonucleotide therapeutics, i.e., siRNAs, to the central nervous system represents a significant barrier to their clinical advancement for the treatment of neurological disorders. Small, endogenous extracellular vesicles were shown to be able to transport lipids, proteins and RNA between cells, including neurons. This natural trafficking ability gives extracellular vesicles the potential to be used as delivery vehicles for oligonucleotides, i.e., siRNAs. However, robust and scalable methods for loading of extracellular vesicles with oligonucleotide cargo are lacking. We describe a detailed protocol for the loading of hydrophobically modified siRNAs into extracellular vesicles upon simple co-incubation. We detail methods of the workflow from ... [摘要]  将寡核苷酸治疗剂即siRNAs有效递送到中枢神经系统代表了治疗神经系统疾病的临床进展的显着障碍。 小的内源性细胞外囊泡显示能够在细胞(包括神经元)之间传输脂质,蛋白质和RNA。 这种天然的贩运能力使细胞外囊泡成为寡核苷酸即siRNA的递送载体的潜力。 然而,缺乏用寡核苷酸载体装载细胞外囊泡的稳健和可扩展的方法。 我们描述了在简单共孵育后将疏水修饰的siRNA加载到细胞外囊泡中的详细方案。 我们详细介绍了从细胞外囊泡纯化到数据分析的工作流程。 该方法可以促进基于细胞外基于囊泡的疗法用于治疗广泛的神经障碍。
【背景】siRNA是一种类型的寡核苷酸治疗剂,一类新的直接靶向信使RNA(mRNA)的药物,以防止导致疾病表型的蛋白质的表达。 siRNA的治疗应用是非常有希望的,因为siRNA可以被设计为靶向任何基因,包括不能用小分子或基于蛋白质的疗法“可药用”的基因。在寡核苷酸治疗剂的化学中取得的进展使得能够设计完全稳定的疏水改性的siRNA(hsiRNA,用2'-O-甲基或2'-氟以及硫代磷酸酯和共价键合到胆固醇的有义链修饰),其促进细胞hsiRNA的自我内化,并保持有效负载在RNA诱导的沉默复合体(RISC)中的能力(Byrne等,2013; Khvorova和Watts,2017)。与乘客链的3'末端连接的胆固醇缀合物对于快速细胞膜缔合是必需的(Byrne等,2013; ...

Determining Efficiency and Selectivity of Lipid Extraction by Perturbing Agents from Model Membranes
Author:
Date:
2016-11-20
[Abstract]  Several membrane-perturbing agents extract lipids from membranes and, in some cases, this lipid efflux is lipid specific. In order to gain a better description of this phenomenon and to detail the intermolecular interactions that are involved, a method has been developed to characterize the extent and the specificity of membrane-lipid extraction by perturbing agents. A perturbing agent is incubated with model membranes existing as multilamellar vesicles (MLVs) and subsequently, the remaining MLVs and the small lipid/perturbing agent complexes resulting from the extraction are isolated and analysed to assess the extent and the specificity of the lipid extraction. [摘要]  几种膜干扰剂从膜提取脂质,并且在一些情况下,该脂质外排是脂质特异性的。为了更好地描述这种现象并详细描述所涉及的分子间相互作用,已经开发了一种方法来表征通过扰动剂提取膜 - 脂质的程度和特异性。将扰动剂与作为多层囊泡(MLV)存在的模型膜一起孵育,随后分离并分析从提取得到的剩余MLV和小脂质/扰动剂复合物,以评估脂质提取的程度和特异性。 br />
[背景] 几种膜干扰剂从膜中提取脂质;这些包括蛋白质,肽和洗涤剂。这些脂质提取中的几种是生物学中的基本过程。在某些情况下,该过程是致命的;这是从细菌膜提取脂质导致细胞死亡的一些抗菌剂的情况(Bechinger,2014; Schaefer等人,2014)。在其他系统中,这个过程是至关重要的。例如,ApoA1是结合细胞并提取磷脂和胆固醇以形成新生高密度脂蛋白(HDL)的蛋白质,这是反向胆固醇转运的关键,因此在控制动脉粥样硬化中起关键作用(Strömstedt et al 。,2010)。已经表明,这些脂质提取物中的一些是脂质特异性的;换句话说,提取级分的脂质组成不同于原始膜的脂质组成。预期这种特异性将更经常地考虑脂质组学的最近进展而报告。一般来说,这些诱导的脂质流出的脂质特异性很差地表征,尽管它在生物过程中起关键作用。我们最近已经显示选择性脂质流出取决于与膜的特异性相互作用(Therrien等人,2013; ...

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