Nitrogen isotope ratios (δ15N) in amino acid standards and in four field-collected samples

These data include Nitrogen Isotope Ratios (δ15N) in amino acid standards and in four field-collected samples. Certified δ15N values are either EA-IRMS values (Glutamic acid [Glu], USGS) or produced by the persulfate oxidization method (Phenylalanine [Phe], Knapp et al., 2005) or provided by McCarthy Lab (M-std and Cyano). Mixtures of 16 amino acids were also evaluated. The newly-developed method used here will help promote the use of δ15N-AA in important studies of nitrogen cycling and trophic ecology in a wide range of research areas. The Phe isotopic standards are available to the community for inter-lab method comparisons. These data were collected by PhD student Wingman (Charlotte) Lee and Dr. Lin Zhang (PI ) at the Texas A&M University-Corpus Christi.本数据集涵盖氨基酸标准品与4份野外采集样品中的氮同位素比值（δ¹⁵N）数据。经认证的δ¹⁵N值来源分为三类：由元素分析仪-同位素比值质谱仪（EA-IRMS）测定的谷氨酸（Glutamic acid [Glu]，美国地质调查局USGS）值、通过过硫酸盐氧化法（persulfate oxidization method）制备的苯丙氨酸（Phenylalanine [Phe]，Knapp等，2005）值，以及麦卡锡实验室（McCarthy Lab）提供的M标准品与蓝藻标准品（M-std and Cyano）。本研究还对16种氨基酸的混合体系开展了测试评估。 本研究采用的新近研发的方法将有助于推动氨基酸态氮同位素比值（δ¹⁵N-AA）在众多研究领域的氮循环与营养生态学重要研究中的应用。苯丙氨酸同位素标准品可向科研共同体开放，用于实验室间的方法比对。本数据集由德克萨斯农工大学科珀斯克里斯蒂分校的博士生Wingman（夏洛特）·李与首席研究员（Principal Investigator, PI）张林博士采集完成。