Development of an HPLC Method with an ODS Column to Determine Low Levels of Aspartame Diastereomers in Aspartame. oleh Takashi Ohtsuki, Ryoichiro Nakamura, Satoru Kubo, Akira Otabe, Yoko Oobayashi, Shoko Suzuki, Mika Yoshida, Mitsuya Yoshida, Chiye Tatebe, Kyoko Sato, Hiroshi Akiyama