Amino acids present in humic acids from soils under different cultivations
Amino acids present in humic acids from soils under different cultivations
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DOI：
10.1016/0160-4120(96)00019-0
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发表时间：
1996
影响因子：
11.8
通讯作者：
L. Szajdak;R. Österberg
中科院分区：
文献类型：
--
作者：
L. Szajdak;R. Österberg
研究了草甸和翻耕土壤中胡敏酸结合态氨基酸的组成。从耕地面积的样品中含有7%的总结合氨基酸的浓度相比，草甸。在这两种样品中，在pH 7下具有中性净电荷的氨基酸显示出最高浓度。另一方面，具有正pH 7净电荷的“碱性”氨基酸的浓度最低。在两种HA样品中，谷氨酸、甘氨酸、丙氨酸和缬氨酸占主导地位。草甸样品中赖氨酸和β-丙氨酸浓度较高，表明微生物生物量较高，因为这两种氨基酸是细菌细胞壁的典型成分。
The composition of bound amino acids in humic acids (HA) prepared from two kinds of soils was investigated: one from a meadow and another from a plowed area. The sample from the plowed area contained a 7% higher concentration of total bound amino acids as compared to that of the meadow. In both samples, the amino acids having a neutral net charge at pH 7 showed the highest concentrations. ‘Basic’ amino acids with a positive pH 7 net charge, on the other hand, had the lowest concentrations. In both HA samples, glutamic acid, glycine, alanine, and valine dominated. The lysine and β-alanine concentrations were higher in the meadow sample indicating a higher microbial biomass, since these two amino acids are typical constituents of the bacterial cell walls.