The infrared identification of a humo-polysaccharide ester in soil humic acid
Titel:
The infrared identification of a humo-polysaccharide ester in soil humic acid
Auteur:
Tan, K. H. McCreery, R. A.
Verschenen in:
Communications in soil science and plant analysis
Paginering:
Jaargang 1 (1970) nr. 2 pagina's 75-84
Jaar:
1970-03
Inhoud:
Studies involving methylation, dissolution, infrared spectroscopy and gas-liquid chromatography were conducted with humic compounds extracted from a Greenville loam and a Cecil sandy loam. The results indicated that methylated humic acid and non-methylated hymatomelanic acid have similar infrared characteristics, with intense C-H absorption at 2980 - 2920 cm-1, and strong C=0 stretching but with very weak C00- stretching at 1720 and 1650 cm-1 respectively. Gas-liquid chromatography yielded chromatograms, having the same number of components, appearing at similar retention times. Dissolution separated hymatomelanic acid into fraction A, with humic acid characteristics; and fraction B, a polysaccharide. This separation released the infrared carboxyl peak at 1650 cm-1 in fraction A. It was concluded that hymatomelanic acid was a naturally occurring ester compound, composed of humic material in ester linkages with polysaccharide.
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