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Ball mill (Mixer Mill MM 400)

球磨机(混合机MM 400)

Company: Retsch
Catalog#: Mixer Mill MM400
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Nitrate Assay for Plant Tissues
Author:
Date:
2017-01-20
[Abstract]  Nitrogen is an essential macronutrient for plant growth and nitrate content in plants can reflect the nitrogen supply of soil. Here, we provide the salicylic acid method to evaluate the nitrate content in plant tissues. The method is reliable and stable, thus it can be a good choice for measurement of nitrate in plant tissues. [摘要]  氮是植物生长必需的大量营养素,植物中的硝酸盐含量可以反映土壤的氮素供应。 在这里,我们提供了水杨酸方法来评估植物组织中的硝酸盐含量。 该方法可靠稳定,可作为植物组织中硝酸盐测定的良好选择。
【背景】氮是植物正常生长发育所需的重要营养元素。通常大多数植物主要以有氧条件下生长的硝酸盐形式吸收氮(Xu et al。,2016)。为了确定植物中的硝酸盐积累,我们需要测试植物不同组织中的硝酸盐含量。有一些测定硝酸盐的方法,例如电位法(Carlson and Keeney,1971),苯并二磺酸法(Bremner,1965),还原还原(Huffman and Barbarick,1981)等方法。这些方法具有一些缺点,例如敏感性较低,干扰,技术人员接触致癌物质(Cataldo等,1975; Vendrell和Zupancic,1990)
在这里,我们提供没有干扰,可靠和稳定的水杨酸方法。硝酸水杨酸在高度酸性条件下通过硝酸盐和水杨酸的反应形成。在碱性(pH> 12)条件下,该复合物为黄色,在410nm具有最大吸收。吸光度与硝酸盐含量成正比。因此,组织中的硝酸盐含量可以根据其吸光度计算。该方法适用于测定植物中的硝酸盐浓度。

Rapid Determination of Cellulose, Neutral Sugars, and Uronic Acids from Plant Cell Walls by One-step Two-step Hydrolysis and HPAEC-PAD
Author:
Date:
2016-10-20
[Abstract]  The plant cell wall is primarily composed of the polysaccharides cellulose, hemicellulose and pectin. The structural and compositional complexity of these components are important for determining cell wall function during plant growth. Moreover, cell wall structure defines a number of functional properties of plant-derived biomass, such as rheological properties of foods and feedstock suitability for the production of cellulosic biofuels. A typical characterization of cell wall chemistry in the molecular biology lab consists of a mild acid hydrolysis for the quantification of hemicellulose and pectin-derived monomers and a separate analysis of cellulose by the Updegraff method. We have adopted a streamlined ‘one-step two-step’ hydrolysis protocol that allows for the simultaneous ... [摘要]  植物细胞壁主要由多糖纤维素,半纤维素和果胶组成。这些组分的结构和组成复杂性对于确定植物生长期间的细胞壁功能是重要的。此外,细胞壁结构限定了植物来源的生物质的多种功能性质,例如食品的流变性质和用于生产纤维素生物燃料的原料适用性。分子生物学实验室中细胞壁化学的典型表征包括用于定量半纤维素和果胶衍生单体的温和酸水解和通过Updegraff方法对纤维素的单独分析。我们采用了一个简化的"一步两步"水解方案,允许通过配对的脉冲安培检测(HPAEC-PAD)的高效阴离子交换层析同时测定纤维素含量,中性糖和糖醛酸样品。在我们的工作中,该方案已经在很大程度上替代了Updegraff纤维素定量和用2μMTFA水解以在微量级上测定基质多糖组成。

[背景] 是基于在121℃下在4%(w/v)硫酸中水解的样品的配对分析。一组样品首先用72%(w/w)硫酸预处理以使纤维素膨胀并使其易于稀释酸水解(图1中的Saeman水解; ...

Analysis of Monosaccharides in Total Mucilage Extractable from Arabidopsis Seeds
Author:
Date:
2016-05-05
[Abstract]  The Arabidopsis thaliana seed coat epidermis produces copious amounts of mucilage polysaccharides (Haughn and Western, 2012). Characterization of mucilage mutants has identified novel genes required for cell wall biosynthesis and modification (North et al., 2014). The biochemical analysis of seed mucilage is essential to evaluate how different mutations affect cell wall structure (Voiniciuc et al., 2015c). Here we describe a robust method to screen the monosaccharide composition of Arabidopsis seed mucilage using ion chromatography (IC). Mucilage from up to 48 samples can be extracted and prepared for IC analysis within 24 h (only 4 h hands-on). Furthermore, this protocol enables fast separation (31 min per sample), automatic detection and ... [摘要]  拟南芥种皮表皮产生大量的粘液多糖(Haughn和Western,2012)。 粘液突变体的表征已经鉴定了细胞壁生物合成和修饰所需的新基因(North等人,2014)。 种子粘液的生物化学分析对于评估不同突变如何影响细胞壁结构是必要的(Voiniciuc等人,2015c)。 在这里我们描述了使用离子色谱(IC)筛选拟南芥种子粘液的单糖组成的有力方法。 在24小时内(仅4小时手动)可以提取并准备来自多达48个样品的粘蛋白并进行IC分析。 此外,该协议使快速分离(每个样品31分钟),自动检测和定量的中性和酸性糖。

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