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首页> 外文期刊>Journal of Nuclear Physics, Material Sciences, Radiation and Applications >Stability of Pyruvic Acid Adsorbed Onto Clays and Exposed to Ionizing Radiation: Relevance in Chemical Evolution
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Stability of Pyruvic Acid Adsorbed Onto Clays and Exposed to Ionizing Radiation: Relevance in Chemical Evolution

机译：丙酮酸吸附到粘土上并暴露于电离辐射的稳定性：化学演化的相关性

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Chemical evolution studies focus on the synthesis and stability of organic molecules during various transformative physicochemical processes. Gaining insight into the possible mechanisms behind these processes requires the use of various energy sources and catalysts that can produce such transformations. In this work, ionizing radiation (~(60)Co) was used as a source of energy, and two clays with different exchangeable cations-sodium and iron (III)-were combined with pyruvic acid, a key alpha keto acid in metabolism. The samples of pyruvic acid were prepared at a concentration of 0.01 M; then, adsorption experiments were carried out by combining sodium or iron montmorillonite at different times. The amount that adsorbed onto iron montmorillonite was greater than the amount that adsorbed onto sodium montmorillonite. Samples of alpha keto acid at the same concentration were irradiated-in the absence of clay-at 0 to 146.1 kGy and at two pHs (6.7 and 2.0). The suspended samples with sodium and iron clay were then irradiated at the same doses. The results show that keto acid decomposes more quickly at more acidic pHs. The main reaction to irradiation without clay involves the dimerization of pyruvic acid, and 2,3-dimethyltartaric acid is the majority product. When irradiated in the presence of clay, the main reaction is decarboxylation, and acetic acid is the majority product. The exchangeable cation type modifies the interactions between the organic molecule and the solid phase. The percentage of recovered pyruvic acid is higher for iron montmorillonite than for sodium montmorillonite.
机译：化学演化研究的重点是各种转化物理化学过程中有机分子的合成和稳定性。要深入了解这些过程背后的可能机制，需要使用各种能产生这种转化的能源和催化剂。在这项工作中，将电离辐射（〜（60）Co）用作能源，并且将具有不同可交换阳离子的两种粘土（钠和铁（III））与丙酮酸（新陈代谢中的关键α-酮酸）结合在一起。丙酮酸样品的制备浓度为0.01 M;然后，通过在不同时间结合钠或铁蒙脱土进行吸附实验。吸附在铁蒙脱石上的量大于吸附在钠蒙脱石上的量。在没有粘土的情况下，在0至146.1 kGy的两个pH值（6.7和2.0）下，辐照相同浓度的α-酮酸样品。然后以相同剂量辐照具有钠和铁粘土的悬浮样品。结果表明，酮酸在更酸性的pH值下分解更快。在没有粘土的情况下进行辐射的主要反应涉及丙酮酸的二聚作用，而2,3-二甲基酒石酸是主要产物。在粘土存在下进行辐照时，主要反应是脱羧，乙酸是主要产物。可交换阳离子类型可改变有机分子与固相之间的相互作用。蒙脱石铁的回收丙酮酸百分比高于蒙脱石钠的丙酮酸百分比。

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