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Vitamin C

L-抗坏血酸

Company: Sigma-Aldrich
Catalog#: A5960
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Chromatographic Analysis for Targeted Metabolomics of Antioxidant and Flavor-Related Metabolites in Tomato
Author:
Date:
2021-03-05
[Abstract]  

Targeted metabolomics is a useful approach to evaluate crop breeding studies. Antioxidant and flavor-related traits are of increasing interest and are considered quality traits in tomato breeding. The present study presents chromatographic methods to study antioxidants (carotenoids, vitamin C, vitamin E, phenolic compounds, and glutathione) and flavor-related characters (sugars and organic acids) in tomato. Two different extraction methods (for polar and apolar entities) were applied to isolate the targeted compounds. The extraction methods developed in this work were time and cost-effective since no further purification was needed. Carotenoids, vitamin C, glutathione, and phenolic acids were analyzed by HPLC-PDA using a RP C18 column at an appropriate wavelength for each compound.

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[摘要]  [摘要]靶向代谢麦克风是评估作物育种研究的有用方法。抗氧化剂和与风味有关的性状受到越来越多的关注,被认为是番茄育种中的品质性状。本研究提供了色谱方法来研究番茄中的抗氧化剂(类胡萝卜素,维生素C,维生素E,酚类化合物和谷胱甘肽)和与风味相关的特征(糖和有机酸)。应用了两种不同的提取方法(针对极性和非极性实体)来分离目标化合物。由于不需要进一步纯化,因此这项工作中开发的提取方法既省时又经济。使用RP C18色谱柱,通过RP-C18色谱柱在适当波长下对每种化合物进行类胡萝卜素,维生素C,谷胱甘肽和酚酸的分析。用RP C18和NH2色谱柱通过HPLC分析维生素E和糖,并分别通过FLD和RI检测器进行检测。此外,MSTFA衍生化后,使用Rtx 5DA色谱柱使用GC-FID分析有机酸。结果,开发了定量重要植物代谢物的灵敏分析方法,并在本文中进行了描述。这些方法不仅适用于番茄,但都还表征其他物种的香味相关的和抗氧化的化合物。因此,这些协议可用于指导作物育种的选择。

[背景]代谢组学是其受到关注的其潜在的援助作物育种研究施加生化途径。在番茄育种中,由于消费者对提高作物品质的偏好,抗氧化剂和与风味有关的代谢产物都受到了越来越多的关注。人类无法自己合成抗氧化剂分子; ...

Measurement of Ascorbic Acid and Glutathione Content in Cyanobacterium Synechocystis sp. PCC 6803
Author:
Date:
2020-10-20
[Abstract]  Ascorbic acid (AsA) and gluthathione (GSH) are two key components of the antioxidant machinery of eukaryotic and prokaryotic cells. The cyanobacterium Synechocystis sp. PCC 6803 presents both compounds in different concentrations (AsA, 20-100 μM and GSH, 2-5 mM). Therefore, it is important to have precise and sensitive methods to determine the redox status in the cell and to detect variations in this antioxidants. In this protocol, we describe an improved method to estimate the content of both antioxidants (in their reduced and oxidized forms) from the same sample obtained from liquid cultures of Synechocystis sp. PCC 6803. [摘要]  [摘要] 抗坏血酸(AsA)和明胶硫(GSH)是真核细胞和原核细胞抗氧化机制的两个重要组成部分。蓝藻Synechocystis sp.pcc6803以不同浓度(AsA,20-100μM和GSH,2-5mm)呈现这两种化合物。因此,有精确和敏感的方法来确定细胞中的氧化还原状态和检测这种抗氧化剂的变化是很重要的。在该方案中,我们描述了一种改进的方法,用以从Synechocystis sp.pcc6803的液体培养中获得的同一样品中估算两种抗氧化剂(以还原形式和氧化形式)的含量。

[背景] 细胞中的氧化还原状态可以被多种因素改变,产生氧化应激。我们使用该方案来量化暴露于50℃高温下的Synechocystis sp. PCC 6803中的GSH和AsA含量。如拟南芥所述,热胁迫导致抗氧化剂含量下降,并通过铁作用引起细胞死亡(Distefano et al., 2017;Aguilera等人,2019年预印本)。虽然本方案是针对Synechocystis sp. PCC 6803制定的,但也可用于测定其他蓝藻中GSH和AsA的含量。蓝藻中AsA含量很低,正常条件下uM含量在一定范围内,某些处理下pM含量在一定范围内。因此,我们提出了这个敏感的方法与一个改进的细胞裂解程序。

6-hydroxydopamine (6-OHDA) Oxidative Stress Assay for Observing Dopaminergic Neuron Loss in Caenorhabditis elegans
Author:
Date:
2018-09-20
[Abstract]  The nematode Caenorhabditis elegans is a powerful genetic model that can be used to investigate neuronal death. Research using C. elegans has been crucial to characterize cell death programmes that are conserved in mammals. Many neuronal signaling components, such as those mediating dopaminergic neurotransmission, are preserved as well. Dopaminergic neurons are progressively lost in Parkinson’s disease and an important risk factor to develop this disease appears to be oxidative stress, the increased occurrence of highly reactive oxygen species. Oxidative stress-induced dopaminergic neurodegeneration is mimicked in animal models by treatment with 6-hydroxydopamine (6-OHDA), a dopamine analog, which is specifically taken up into dopaminergic neurons. After exposing C. ... [摘要]  线虫 Caenorhabditis elegans 是一种强大的遗传模型,可用于研究神经元死亡。使用 C进行研究。线虫对于表征哺乳动物中保守的细胞死亡程序至关重要。许多神经元信号传导组分,例如介导多巴胺能神经传递的组分,也被保留。多巴胺能神经元在帕金森病中逐渐丧失,并且发展该疾病的重要风险因素似乎是氧化应激,高活性氧物种的出现增加。通过用多巴胺类似物6-羟基多巴胺(6-OHDA)处理,在动物模型中模拟氧化应激诱导的多巴胺能神经变性,所述多巴胺类似物特异性地摄入多巴胺能神经元。暴露 C后。线虫到6-OHDA,可以很容易地监测荧光标记的多巴胺能神经元的丢失。生物体对氧化应激的敏感性被认为受基础内在氧化应激水平和抵抗氧化应激和氧化应激诱导的损伤的能力的影响。 C.线虫'6-OHDA模型'导致发现保护多巴胺能神经元所需的新基因,并且它有助于确定保守细胞死亡和细胞吞噬途径对多巴胺能神经变性的影响。在这里,我们描述了一个简单的协议,允许在 C中6-OHDA处理后容易检测多巴胺能神经元损失。线虫。

【背景】在暴露于氧化应激诱导药物6-羟基多巴胺(6-OHDA)后,可以在动物模型中概括多巴胺能神经元的逐渐丧失(综述Schober,2004)。与其他神经退行性药物如MPTP(1-甲基-4-苯基-1,2,3,6-四氢吡啶)相比,6-OHDA更安全,因为它不能通过血脑屏障。 ...

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