氚标记化合物 IX.测定非挥发性反应物在生成水-t 反应中的同位素效应。碘氧化醛-1-t。

IF 5.6 1区农林科学 Q1 AGRONOMY

Agricultural and Forest Meteorology Pub Date : 1963-11-01 Epub Date: 1963-12-01 DOI:10.6028/jres.067A.054

Horace S Isbell, Lorna T Sniegoski

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引用次数: 0

摘要

本文提出了一种简便的方法，用于估算产生水-t 的反应中的同位素效应。通过冷冻干燥分离出水-t，然后根据反应程度和水-t 的放射性与初始反应物的放射性之比计算出 k*/k。将该方法应用于在 25 °C 下用碘在碱性溶液中氧化醛糖-1-t，得出的 k*/k 值在 0.12 到 0.17 之间，平均值为 0.14。不同构型的醛糖、戊糖和己糖的 k*/k 值没有明显差异。同位素效应相当于已标记和未标记分子各自反应速率的一比七。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Tritium-Labeled Compounds IX. Determination of Isotope Effects in Reactions Yielding Water-t from Nonvolatile Reactants. Oxidation of Aldoses-1-t With Iodine.

A convenient method is presented for estimating isotope effects in reactions which yield water-t. The water-t is separated by freeze-drying, and k*/k is calculated from the extent of the reaction and the ratio of the radioactivity of the water-t to that of the initial reactant. Application of the method to the oxidation of aldoses-1-t at 25 °C with iodine in alkaline solution gives values for k*/k ranging from 0.12 to 0.17, with an average of 0.14. There are no significant differences in the values of k*/k obtained for aldoses differing in configuration, or for pentoses and hexoses. The isotope effect corresponds to a ratio of one to seven for the respective rates of reaction of the labeled and unlabeled molecules.

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来源期刊

Agricultural and Forest Meteorology 农林科学-林学

CiteScore

10.30

自引率

9.70%

发文量

415

审稿时长

69 days

期刊介绍： Agricultural and Forest Meteorology is an international journal for the publication of original articles and reviews on the inter-relationship between meteorology, agriculture, forestry, and natural ecosystems. Emphasis is on basic and applied scientific research relevant to practical problems in the field of plant and soil sciences, ecology and biogeochemistry as affected by weather as well as climate variability and change. Theoretical models should be tested against experimental data. Articles must appeal to an international audience. Special issues devoted to single topics are also published. Typical topics include canopy micrometeorology (e.g. canopy radiation transfer, turbulence near the ground, evapotranspiration, energy balance, fluxes of trace gases), micrometeorological instrumentation (e.g., sensors for trace gases, flux measurement instruments, radiation measurement techniques), aerobiology (e.g. the dispersion of pollen, spores, insects and pesticides), biometeorology (e.g. the effect of weather and climate on plant distribution, crop yield, water-use efficiency, and plant phenology), forest-fire/weather interactions, and feedbacks from vegetation to weather and the climate system.