Analysis of methylated humic acids from fossil fuels by size exclusion chromatography and NMR |
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| Affiliation: | 1. Department of Physical Chemistry, University of Leeds, Leeds LS2 9JT, U.K.;2. Science Faculty, Cukurova University, Adana, Turkey;1. Nuclear and Energy Research Institute, IPEN-CNEN/SP, Av. Prof. Lineu Prestes, 2242 – Cidade Universitária, CEP 05508-000 São Paulo, SP, Brazil;2. Institute of Applied Radiation Chemistry, IARC, Lodz University of Technology, Wroblewskiego 15, 93-590 Lodz, Poland;1. Regional Centre of Advanced Technologies and Materials, Department of Analytical Chemistry, Faculty of Science, Palacký University in Olomouc, 17. listopadu 12, 771 46 Olomouc, Czech Republic;2. Institute of Microbiology, v.v.i., Videnska 1083, 142 20 Prague 4, Czech Republic;3. Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX 76019, USA;1. Department of Analytical Chemistry, China Pharmaceutical University, Nanjing 210009, PR China;2. Key Laboratory of Drug Quality Control and Pharmacovigilance (Ministry of Education), China Pharmaceutical University, Nanjing 210009, PR China;3. State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing 210009, PR China;1. Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil;2. Serviço de Genética Médica, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil;3. Serviço de Patologia, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil;1. Sanofi, LGCR Chemistry, 65926 Frankfurt am Main, Germany;2. University of Hamburg, Department of Chemistry, Pharmaceutical and Medicinal Chemistry, Bundesstraße 45, 20146 Hamburg, Germany |
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| Abstract: | Molecular Mass (MM) distributions in humic acids from peat and two lignites have been investigated by high performance size-exclusion chromatography (SEC) after methylation and found to be in the range approximately 300 to more than 5000, with number average NM(Mn) near 800. Values of Mn determined by SEC were in good agreement with those from vapour pressure osmotery. High field13C NMR spectra of the methylated humic acids are extremely well resolved, and indicate that the samples are significantly different, despite their similar elemental compositions and MM distributions. |
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