1977
DOI: 10.1021/ac50009a008
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Determination of the D and L isomers of some protein amino acids present in soils

Abstract: The o and l isomers of some protein amino acids present In soils were measured by using a gas chromatographic technique. The results of two processing procedures were compared to determine the better method. Results of the comparison indicated that the determination of o and l percentages requires amino acid purification If one is tb obtain accurate data. It was found that very significant amounts of o-alartlne, o-aspartic acid, and o-glutamic acid were present in the contemporary soils studied. Valine, isoleu… Show more

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Cited by 57 publications
(14 citation statements)
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“…It can be seen that peaks corresponding in retention time to each of the seven possible six-carbon chain isomers and to norvaline are present. This may be due in part to coincidence in retention time with an unknown component(s) (note the asymmetry of the leading edge of peak 13), although epimerization of L-isoleucine during the hydrolysis step would contribute to the D-aUoisoleucine content of the sample (Pollock et al 1977). Well resolved paired peaks of about equal size are seen corresponding to the enantiomorphs of pleu (6,7) and 2-a-2,3-dmba (10,11).…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…It can be seen that peaks corresponding in retention time to each of the seven possible six-carbon chain isomers and to norvaline are present. This may be due in part to coincidence in retention time with an unknown component(s) (note the asymmetry of the leading edge of peak 13), although epimerization of L-isoleucine during the hydrolysis step would contribute to the D-aUoisoleucine content of the sample (Pollock et al 1977). Well resolved paired peaks of about equal size are seen corresponding to the enantiomorphs of pleu (6,7) and 2-a-2,3-dmba (10,11).…”
Section: Resultsmentioning
confidence: 99%
“…The dry extract used for GC-MS analysis was dissolved in a small volume of 0.01N HC1 for desalting (Pollock et al 1977). Fragments weighing 15.5g were used for the GC-MS analysis and interior fragments weighing 0.22g were used for quantitative analysis by ion exchange chromatography.…”
Section: Methodsmentioning
confidence: 99%
“…Gyttja can absorb contaminants such as bacteria, fungi, and molds or loose material through leaching. In addition, D-aspartic acid is commonly produced by bacteria (Pollack et al 1977).…”
Section: Discussionmentioning
confidence: 99%
“…To determine chemical changes that may cause the fluctuations in potential DON bioavailability, we monitored concentrations of the major identifiable DON compounds during the flood: urea and dissolved free and combined amino acids (DFAA and DCAA, respectively). In addition, the fraction of D-enantiomers in amino acids was analyzed, because a high proportion of D-forms in DCAA is suggested to indicate old and refractory organic material (Pollock et al 1977;Mc-Carthy et al 1998;Jørgensen et al 1999).…”
mentioning
confidence: 99%