LIANG Jian-xin,YIN Xi-jie,LI Yu-hong,LIN Xi-huang.Study on the Compound Specific Nitrogen Stable Isotope Determination of Amino Acids[J].Journal of Instrumental Analysis,2025,44(02):334-341.
LIANG Jian-xin,YIN Xi-jie,LI Yu-hong,LIN Xi-huang.Study on the Compound Specific Nitrogen Stable Isotope Determination of Amino Acids[J].Journal of Instrumental Analysis,2025,44(02):334-341. DOI: 10.12452/j.fxcsxb.24052880.
Study on the Compound Specific Nitrogen Stable Isotope Determination of Amino Acids
This study investigated a method for determining the content and nitrogen isotopic composition of amino acids in different samples. Amino acids were derivatized using N-pivaloyl-O-isopropyl ester(NPP) and analyzed via gas chromatography-mass spectrometry(GC-MS) and gas chromatography-combustion-isotope ratio mass spectrometry(GC-C-IRMS). Results showed effective separation of 15 amino acid standards after NPP derivatization on GC-MS,with good linearity(
r
2
>0.98) between concentration and peak area in the range of 1.0-16.0 μmol/L. The GC-C-IRMS analysis yielded
δ
15
N values for the 15 amino acid standards with a precision of 0.22‰-0.76‰(
n
=8),comparable to those obtained by elemental analysis-isotope ratio mass spectrometry(EA-IRMS),with a difference ranging from 0.15‰ to 1.14‰. The strong correlation(
r
2
=0.995 4) between the two methods suggests that the derivatization process did not introduce significant isotopic fractionation. Stable and accurate
δ
15
N values were achieved with
an injection amount greater than 20 ng N(corresponding to a[N
2
+
]
m
/
z
28 signal intensity of approximately 150 mV),resulting in an average precision of 0.36‰. Analysis of soybean and soil samples revealed
δ
15
N values ranging from 10.90‰ to 22.32‰ and -1.92‰ to 12.82‰,respectively,with standard deviations of 0.23‰-0.88‰ and 0.08‰-0.79‰,respectively,meeting the accuracy requirements for sample analysis.
gas chromatography-combustion-isotope ratio mass spectrometry(GC-C-IRMS)N-pivaloyl-O-isopropyl (NPP)amino acidnitrogen stable isotope
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