Alicyclic carboxylic acids in soil humic acid as detected with ultrahigh resolution mass spectrometry and multi-dimensional NMR

DiDonato, Nicole; Hatcher, Patrick G.

doi:10.1016/j.orggeochem.2017.06.010

Cited by 31 publications

(19 citation statements)

References 35 publications

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“…Pesticide sorption parameters are among the most sensitive input parameters in pesticide fate models (Dubus et al, 2003; Fan et al, 2008; Farenhorst et al, 2009; Nolan et al, 2015). These models are essential tools in regulatory exposure assessments of currently used pesticides and in the registration process of new pesticide products.…”

Section: Modeling Of Metal Ion Binding In Soilsmentioning

confidence: 99%

Environmental and Agricultural Relevance of Humic Fractions Extracted by Alkali from Soils and Natural Waters

et al. 2019

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To study the structure and function of soil organic matter, soil scientists have performed alkali extractions for soil humic acid (HA) and fulvic acid (FA) fractions for more than 200 years. Over the last few decades aquatic scientists have used similar fractions of dissolved organic matter, extracted by resin adsorption followed by alkali desorption. Critics have claimed that alkaliextractable fractions are laboratory artifacts, hence unsuitable for studying natural organic matter structure and function in field conditions. In response, this review first addresses specific conceptual concerns about humic fractions. Then we discuss several case studies in which HA and FA were extracted from soils, waters, and organic materials to address meaningful problems across diverse research settings. Specifically, one case study demonstrated the importance of humic substances for understanding transport and bioavailability of persistent organic pollutants. An understanding of metal binding sites in FA and HA proved essential to accurately model metal ion behavior in soil and water. In landscape-based studies, pesticides were preferentially bound to HA, reducing their mobility. Compost maturity and acceptability of other organic waste for land application were well evaluated by properties of HA extracted from these materials. A young humic fraction helped understand N cycling in paddy rice (Oryza sativa L.) soils, leading to improved rice management. The HA and FA fractions accurately represent natural organic matter across multiple environments, source materials, and research objectives. Studying them can help resolve important scientific and practical issues.

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Section: Modeling Of Metal Ion Binding In Soilsmentioning

confidence: 99%

Environmental and Agricultural Relevance of Humic Fractions Extracted by Alkali from Soils and Natural Waters

et al. 2019

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“…Chen et al (2014) suggested that this material represented black carbon‐like organic matter formed from noncombustion oxidation of the dissolved organic matter by photochemically produced hydroxyl radical. Later, DiDonato et al (2016) and DiDonato and Hatcher (2017) suggested that such material resided in soil humic acids, formed by oxidative processes known to produce hydroxyl radicals. Recently, Trusiak et al (2018) showed that hydroxyl radicals readily form in Fe‐enriched soil systems that receive rain events, bringing dissolved oxygen to the soil.…”

Section: Resultsmentioning

confidence: 99%

Evidence for the Existence of Humic Acids in Peat Soils Based on Solid‐State ¹³C NMR

2019

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Humic extracts, in particular humic acids, of organic-rich peat soils were examined by solid-state 13 C nuclear magnetic resonance (NMR) and shown to be integral components of the peat, contrary to recent suggestions that humic materials are artifacts of alkali extraction. The authenticity of humic substances is demonstrated by recombining the various humic fractions and comparing the NMR spectrum of the recombined peat with the original untreated peat sample. Even though significant NMR-determined structural differences exist between humic acids and the insoluble humin fractions, the recombination reproduces the original unextracted peat quite well. Applying a biopolymer mixing model to the spectra shows that humic acids have a high proportion of char-like material that is interpreted as being derived from noncombustion polymerization or secondary synthesis during humification, a process that has been challenged by a recent soil formation model.

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“…e chemical shift was closely related to the electron cloud density on the carbon atom. e electron cloud density of carbon atom in carboxylic acid and carboxylate was different, so the chemical shift was also inconsistent [32][33][34]. In this research, GHB was one kind of carboxylic acid; when sodium salt and other food additives were simultaneously present in beverages, they would form carboxylate with GHB.…”

Section: Downfield Of Chemical Shift Of β Carbon Atom Of Ghb Inmentioning

confidence: 76%

Food Safety Risk Assessment of γ-Butyrolactone Transformation into Dangerous γ-Hydroxybutyric Acid in Beverages by Quantitative ¹³C-NMR Technique

Jin

Xiao

Cao

et al. 2020

Journal of Food Quality

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Food safety remains a matter of great concern in most countries and the composition in food is crucial to food safety. It is very important to make sense of the quality and change of food ingredients. In this research, the change of γ-butyrolactone (GBL), one kind of food additive in beverage, had been evaluated by nuclear magnetic resonance (NMR) technique. The 1H-NMR results of seven beverages covering various kinds with spiked GBL indicated that GBL was transformed into dangerous γ-hydroxybutyric acid (GHB) in six popular beverages under certain conditions which could happen during transportation and storage. Further results of quantitative 13C-NMR showed that pH and temperature were two key factors affecting the transforming degree of GBL to GHB. Lower pH and higher temperature will increase the degree of transformation. GHB was a neurotransmitter on the chemical control list, which was absolutely forbidden to be added to food. This nondestructive NMR detecting technology which did not need the complex pretreatment method to directly determine food ingredients can be useful for identifying the risk of food safety from the changes of food composition during transport and storage.

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Alicyclic carboxylic acids in soil humic acid as detected with ultrahigh resolution mass spectrometry and multi-dimensional NMR

Cited by 31 publications

References 35 publications

Environmental and Agricultural Relevance of Humic Fractions Extracted by Alkali from Soils and Natural Waters

Environmental and Agricultural Relevance of Humic Fractions Extracted by Alkali from Soils and Natural Waters

Evidence for the Existence of Humic Acids in Peat Soils Based on Solid‐State ¹³C NMR

Food Safety Risk Assessment of γ-Butyrolactone Transformation into Dangerous γ-Hydroxybutyric Acid in Beverages by Quantitative ¹³C-NMR Technique

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Alicyclic carboxylic acids in soil humic acid as detected with ultrahigh resolution mass spectrometry and multi-dimensional NMR

Cited by 31 publications

References 35 publications

Environmental and Agricultural Relevance of Humic Fractions Extracted by Alkali from Soils and Natural Waters

Environmental and Agricultural Relevance of Humic Fractions Extracted by Alkali from Soils and Natural Waters

Evidence for the Existence of Humic Acids in Peat Soils Based on Solid‐State 13C NMR

Food Safety Risk Assessment of γ-Butyrolactone Transformation into Dangerous γ-Hydroxybutyric Acid in Beverages by Quantitative 13C-NMR Technique

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Product

Resources

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Evidence for the Existence of Humic Acids in Peat Soils Based on Solid‐State ¹³C NMR

Food Safety Risk Assessment of γ-Butyrolactone Transformation into Dangerous γ-Hydroxybutyric Acid in Beverages by Quantitative ¹³C-NMR Technique