Two Compounds Isolated From Peat Soils.

Robinson, Chas. S.

doi:10.1021/ja02217a016

Cited by 9 publications

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“…Although there is a superficial similarity between the N distributions in soil and protein hydrolysates, the only valid conclusion is that acid hydrolysates of soil contain ammonia and amino compounds which yield N 2 on treatment with nitrous acid at room temperature. Several aminoacids have been isolated, from soil; leucine and isoleucine (Robinson, 1911), arginine and histidine (Schreiner & Shorey, 1910a) and lysine (Shorey, 1913). Suzuki (1906-8) isolated alanine, leucine, aspartic acid and other amino-acids from the acid hydrolysate of a 'humic acid' preparation by Fischer's esterification method.…”

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Studies on soil organic matter: Part I. The chemical nature of soil organic nitrogen

Bremner

1949

J. Agric. Sci.

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1. The acid hydrolysis of six soils with nitrogen contents ranging from 0·1 to 2·38% has been studied by determining the amounts of ammonia-, humin- and α-amino-N present in the soil hydrolysates after various periods of hydrolysis.2. Under the conditions of hydrolysis employed (3 ml. of 6N-HCl/g. soil) the period required for maximum liberation of amino-acids from the soils was about 12 hr. 24·2–37·1% of the total-nitrogen of the soils examined was liberated as α-amino-N in this period. Further hydrolysis led to destruction of amino-acids. Similar amounts of α-amino-N were liberated by hydrolysis of the soils with alkali (5N-NaOH).3. From 69 to 87% of the total-nitrogen of the soils was brought into solution by acid hydrolysis; the amount dissolved by hydrolysing with alkali or with alkali under reducing conditions (alkalistannite) was not significantly different. It is concluded that most of the insoluble-nitrogen found after acid hydrolysis is not derived from protein material, and it is suggested that some of this nitrogen is in the form of heterocyclic nitrogen compounds.

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confidence: 99%