Development of an HPLC Method with an ODS Column to Determine Low Levels of Aspartame Diastereomers in Aspartame

Takashi Ohtsuki, Ryoichiro Nakamura, Satoru Kubo, Akira Otabe, Yoko Oobayashi, Shoko Suzuki, Mika Yoshida, Mitsuya Yoshida, Chiye Tatebe, Kyoko Sato and Hiroshi Akiyama

PLOS ONE, 2016, vol. 11, issue 3, 1-8

Abstract: α-L-Aspartyl-D-phenylalanine methyl ester (L, D-APM) and α-D-aspartyl-L-phenylalanine methyl ester (D, L-APM) are diastereomers of aspartame (N-L-α-Aspartyl-L-phenylalanine-1-methyl ester, L, L-APM). The Joint FAO/WHO Expert Committee on Food Additives has set 0.04 wt% as the maximum permitted level of the sum of L, D-APM and D, L-APM in commercially available L, L-APM. In this study, we developed and validated a simple high-performance liquid chromatography (HPLC) method using an ODS column to determine L, D-APM and D, L-APM in L, L-APM. The limits of detection and quantification, respectively, of L, D-APM and D, L-APM were found to be 0.0012 wt% and 0.004 wt%. This method gave excellent accuracy, repeatability, and reproducibility in a recovery test performed on five different days. Moreover, the method was successfully applied to the determination of these diastereomers in commercial L, L-APM samples. Thus, the developed method is a simple, useful, and practical tool for determining L, D-APM and D, L-APM levels in L, L-APM.

Date: 2016
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0152174

DOI: 10.1371/journal.pone.0152174

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