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Equity®-5 Capillary GC Column

Company: Sigma-Aldrich
Catalog#: 28089-U
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Tracking Lipid Transfer by Fatty Acid Isotopolog Profiling from Host Plants to Arbuscular Mycorrhiza Fungi
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Date:
2018-04-05
[Abstract]  Lipid transfer from host plants to arbuscular mycorrhiza fungi was hypothesized for several years because sequenced arbuscular mycorrhiza fungal genomes lack genes encoding cytosolic fatty acid synthase (Wewer et al., 2014; Rich et al., 2017). It was finally shown by two independent experimental approaches (Jiang et al., 2017; Keymer et al., 2017; Luginbuehl et al., 2017). One approach used a technique called isotopolog profiling (Keymer et al., 2017). Isotopologs are molecules, which differ only in their isotopic composition. For isotopolog profiling an organism is fed with a heavy isotope labelled precursor metabolite. Subsequently, the labelled isotopolog composition of metabolic products is analysed via mass spectrometry. The ... [摘要]  因为测序的丛枝菌根真菌基因组缺乏编码胞质脂肪酸合酶的基因(Wewer等人,2014; Rich等人,2014),因此假定脂质从宿主植物转移到丛枝菌根真菌数年。 / em>,2017)。最终通过两种独立的实验方法(Jiang等人,2017; Keymer等人,2017; Luginbuehl等人, ), 2017年)。一种方法使用称为同位素体谱分析的技术(Keymer等人,2017)。同位素体是分子,它们的同位素组成不同。对于同位素生物学分析,生物体被喂以重同位素标记的前体代谢物。随后,通过质谱分析代谢产物的标记同位素组成。检测到的目标代谢物的同位素体模式产生关于代谢途径和通量的信息(Ahmed et al。,2014)。以下协议描述了一个实验装置,该装置能够在由丛枝菌根真菌及其相关真菌胞外菌丝体定植的植物根中分离出脂肪酸的单独同位素分布图,以阐明两种共生生物之间的通量。我们预测,如果两种相互作用的生物体可以物理分离,则该策略还可以用于研究其他生物体之间的代谢物通量。

【背景】丛枝菌根真菌是生物营养生物。因此,它们不能独立栽培,而是依靠与寄主植物的相互作用来维持生命并完成它们的生命周期。这一特征使得研究两种共生生物,特别是单独的真菌具有挑战性。

为了培养,处理和收获与宿主根分开的真菌,开发了2室培养皿系统,并将其用于以前工作中的标记研究(Bécard和Fortin,1988; ...

GC/MS-based Analysis of Volatile Metabolic Profile Along in vitro Differentiation of Human Induced Pluripotent Stem Cells
Author:
Date:
2017-12-05
[Abstract]  Human induced pluripotent stem cells (hiPSCs) are a promising tool in cell-based therapies for degenerative diseases. A safe application of hiPSCs in vivo, requires the detection of the presence of residual undifferentiated pluripotent cells that can potentially cause the insurgence of teratomas. Several studies point out that metabolic products may provide an alternative method to identify the different steps of cells differentiation. In particular, the analysis of volatile organic compounds (VOCs) is gaining a growing interest in this context, thanks to its inherent noninvasiveness. Here, a protocol for VOCs analysis from human induced pluripotent stem cells (hiPSCs) is illustrated. It is based on Solid-Phase Microextraction (SPME) technique coupled with gas chromatography-mass ... [摘要]  人诱导的多能干细胞(hiPSC)是用于退化性疾病的基于细胞的疗法中的有前景的工具。 hiPSCs在体内的安全应用需要检测残留未分化多能细胞的存在,这可能会导致畸胎瘤的爆发。几项研究指出,代谢产物可能提供了另一种方法来确定细胞分化的不同步骤。特别是挥发性有机化合物(VOCs)的分析由于其固有的非侵入性而在这方面越来越受到关注。在这里,说明了从人诱导的多能干细胞(hiPSC)分析VOC的方案。它基于固相微萃取(SPME)技术与气相色谱 - 质谱联用(GC / MS)。该方法用于测量从绒毛膜样品(CVS)到hiPSC的细胞重编程期间和沿着hiPSC体外分化成早期神经祖细胞(NP)的细胞顶空中的挥发性代谢物修饰,穿过胚状体机构(EBs)的形成。

【背景】提出细胞代谢作为在分化的各个步骤期间研究干细胞的替代物。事实上,假设干细胞从多能性向完全分化的转变可能引起代谢产物的剧烈变化是合理的。在诱导的多能干细胞,亲本成纤维细胞和胚胎干细胞之间观察到了这种假设的第一个证据(Meissen等人,2012)。

在代谢产物中,挥发性有机化合物(VOC)吸引了人们对其收集的简单性,内在的非侵入性和广泛的分析方法的广泛关注(Boots et。,2015 ...

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