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首页> 外文期刊>Marine Chemistry >Periodate oxidation of marine high molecular weight dissolved organic matter: Evidence for a major contribution from 6-deoxy- and methyl sugars
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Periodate oxidation of marine high molecular weight dissolved organic matter: Evidence for a major contribution from 6-deoxy- and methyl sugars

机译：海洋高分子量溶解有机物的高碘酸盐氧化：6-脱氧和甲基糖有重要贡献的证据

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Nuclear magnetic resonance spectroscopy has been used to infer that marine high molecular weight dissolved organic matter (HMWDOM) is a mixture of carbohydrates, proteins, and lipids. However, acid and base catalyzed hydrolysis of HMWDOM followed by molecular level analyses using gas and liquid chromatography provide only low to modest yields of simple sugars, amino acids, and lipids. Here we use periodate over-oxidation to investigate the composition of HMWDOM. Our analyses show that the oxidation of HMWDOM carbohydrate consumes more periodate per carbon on a molar basis (1.3:1) than simple sugars (0.8:1) or linear polysaccharides (1.0:1), and that HMWDOM is highly branched. We also recover acetic acid and methanol as major oxidation products. Methanol and acetic acid are derived from the oxidation of methyl and 6-deoxy sugars, and our analyses suggest these sugars are major components of HMWDOM. Periodate over-oxidation shows that lipids are not major constituents of HMWDOM, and that most of the alkyl carbon observed in the ~(13)CNMR spectra between 0-45 ppm that has been previously assigned to lipids is due to the methyl carbons of acetamide and 6-deoxy sugars.
机译：核磁共振波谱已被用于推断海洋高分子量溶解有机物（HMWDOM）是碳水化合物，蛋白质和脂质的混合物。但是，HMWDOM的酸和碱催化水解，然后使用气相色谱和液相色谱进行分子水平分析，只能提供低到中等的简单糖，氨基酸和脂质收率。在这里，我们使用高碘酸盐过氧化来研究HMWDOM的组成。我们的分析表明，与单糖（0.8：1）或线性多糖（1.0：1）相比，HMWDOM碳水化合物的氧化消耗的每摩尔碳高碘酸盐（1.3：1）比HMWDOM高度支化。我们还回收乙酸和甲醇作为主要的氧化产物。甲醇和乙酸来自甲基和6-脱氧糖的氧化，我们的分析表明这些糖是HMWDOM的主要成分。高碘酸盐的过度氧化表明脂质不是HMWDOM的主要成分，并且在〜（13）CNMR光谱中观察到的大多数烷基碳在0-45 ppm之间先前已分配给脂质，这是由于乙酰胺的甲基碳和6-脱氧糖。

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