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Vial insert, 250 µL, glass, conical with polymer feet

小瓶插入,250μL,带聚合物脚的玻璃,100 / pk

Company: Agilent Technologies
Catalog#: 5181-1270
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GC-MS-Based Analysis of Methanol: Chloroform-extracted Fatty Acids from Plant Tissues
Author:
Date:
2018-09-20
[Abstract]  Fatty acids (FAs) are carboxylic acids with long aliphatic chains that may be straight, branched and saturated or unsaturated. Most of the naturally occurring plant FAs contains an even number of carbon (C4-C24). FAs are used in food and pharmacological industries due to their nutritional importance. In addition, FAs are considered as a promising alternative for the production of biodiesel from terrestrial plant biomass. To establish commercial applications, more reliable analytical methods are needed for the identification, quantification, and composition determination of FAs. Here, we describe a relatively rapid and sensitive method for the extraction, identification, and quantification of FAs from a small quantity of plant tissue. The method includes steps of lipid extraction, ... [摘要]  脂肪酸(FAs)是具有长脂肪链的羧酸,其可以是直链,支链和饱和或不饱和的。大多数天然存在的植物FA含有偶数碳(C4-C24)。由于其营养重要性,FA用于食品和药理学工业。此外,FAs被认为是从陆地植物生物质生产生物柴油的有前途的替代品。为了建立商业应用,需要更可靠的分析方法来确定FA的鉴定,定量和组成。在这里,我们描述了一种相对快速和灵敏的方法,用于从少量植物组织中提取,鉴定和量化FA。该方法包括脂质提取,通过转甲基化将脂质转化为脂肪酸甲酯(FAME),使用气相色谱 - 质谱(GC-MS)鉴定和定量FAME的步骤。在该方案中,在GC-MS分析之前添加内标。每个FA的量由其相对于内标峰面积的峰面积计算。

【背景】脂肪酸的合成对于代谢能的储存是重要的。不断增长的人口和能源成本强调了生产可持续可再生燃料的必要性。第二代生物燃料的来源是非食用油籽作物或木质纤维素生物质,主要包括作物植物的废弃物,如多年生草,包括柳枝稷,果壳,稻草和森林残留物(Hadar,2013)。在这种情况下,植物可以作为研究脂肪酸用于营养保健品和生物柴油方面的优秀系统。此外,在生物柴油生产中,燃料的清洁燃烧性质受到FA的结构特征的影响,包括链长和不饱和度(Knothe,2005)。木质纤维素生物质是直接从经济有效的资源生产这些产品的更环保的替代品。使用GC-MS进行FA分析可以对单一植物提取物中相对多种脂肪酸进行标准化,注释和定量。脂质提取的效率取决于溶剂的极性。极性脂质(如糖脂或磷脂)更易溶于极性溶剂(如醇类),非极性脂质(如三酰基甘油)更易溶于非极性溶剂(如氯仿)。因此,总脂质提取取决于有机溶剂的性质。 ...

GC-MS-Based Analysis of Chloroform Extracted Suberin-Associated Root Waxes from Arabidopsis and Other Plant Species
Author:
Date:
2015-12-20
[Abstract]  The periderm and exodermis of taproots and tuberous taproots contain an extracellular lipid polymer, suberin, deposited in their cell walls. This polymer is intractable in organic solvents, and is co-deposited with chloroform-extractable waxes. These suberin-associated root waxes are typically composed of alkanes, primary alcohols, fatty acids, alkyl ferulates, alkyl caffeates, and alkyl coumarates (Espelie et al., 1980; Li et al., 2007; Kosma et al., 2015). They are believed to contribute to the diffusion barrier properties of suberized cell walls (Soliday et al., 1979), and possibly have other roles yet to be discovered. Here we describe a protocol to extract and analyze waxes associated with root suberin. This fraction of aliphatic components is ... [摘要]  子叶和块根状茎的外胚层和外皮含有沉积在其细胞壁中的细胞外脂质聚合物,软骨素。该聚合物在有机溶剂中难以处理,并与氯仿萃取蜡共沉积。这些软骨素相关的根蜡通常由烷烃,伯醇,脂肪酸,烷基阿魏酸酯,烷基咖啡酸酯和烷基香豆酸酯组成(Espelie等人,1980; Li等人,/em>,2007; Kosma ,,2015)。它们被认为有助于增加蜂窝细胞壁的扩散阻挡性能(Soliday等人,1979),并且可能具有尚待发现的其它作用。在这里我们描述一个协议,以提取和分析与根软骨素相关的蜡。该部分脂族组分通过在氯仿中全根浸提提取,然后化学改性以制备更适合于气相色谱分析的样品。该方案针对拟南芥进行优化,但可以与本文所述的其他植物的根一起使用。

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