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首页> 外文期刊>Journal of Experimental Botany >Why are literature data for H2O2 contents so variable? A discussion of potential difficulties in the quantitative assay of leaf extracts
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Why are literature data for H2O2 contents so variable? A discussion of potential difficulties in the quantitative assay of leaf extracts

机译:为什么H 2 O 2 内容的文献数据如此变化?叶提取物定量测定中潜在困难的讨论

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摘要

Leaf metabolism produces H2O2 at high rates, but current concepts suggest that the potent signalling effects of this oxidant require that concentrations be controlled by a battery of antioxidative enzymes. The extent to which H2O2 is allowed to accumulate remains unclear. There is little consensus on leaf H2O2 values in the literature and measured concentrations in unstressed conditions range from 50–5000 nmol g−1 fresh weight, a difference that probably reflects technical inaccuracies as much as biological variability. This article uses new experimental and literature data to examine some of the difficulties in accurately measuring H2O2 in leaf extracts. Potential problems relate to sensitivity, interference from other redox-active compounds, and H2O2 stability during sample preparation. Particular attention is drawn to the influence of tissue mass/extraction volume in the quantitative estimation of H2O2 contents, and the possibility that this factor could contribute to the variability of literature data.
机译:叶片的新陈代谢高速率产生H 2 O 2 ,但是目前的观念表明,这种氧化剂的强信号传导作用要求其浓度由一系列抗氧化酶控制。 H 2 O 2 的累积程度尚不清楚。文献中对叶片H 2 O 2 的值几乎没有共识,在无胁迫条件下测得的浓度范围为50–5000 nmol g -1 鲜重,这一差异可能反映出技术上的不准确性以及生物学上的差异。本文使用新的实验和文献数据来研究准确测量叶片提取物中H 2 O 2 的一些困难。潜在问题涉及灵敏度,样品中其他氧化还原活性化合物的干扰以及H 2 O 2 的稳定性。特别要注意组织质量/提取量对H 2 O 2 含量的定量估计的影响,以及该因素可能会导致H 2 O 2文献数据。

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